MiniPurge Type X / ET Size 1 Manual ML 442€¦ · 4 ML442 | v1 9 Expo Technologies UK T: +44 (0)...
Transcript of MiniPurge Type X / ET Size 1 Manual ML 442€¦ · 4 ML442 | v1 9 Expo Technologies UK T: +44 (0)...
ML442 | v19 02-Dec-19
MiniPurge Type X / ET Size 1 Manual
ML 442
Contents
1. Specification Sheet – MiniPurge Type X Systems 2. IECEx Conditions of Certification & (Specials Conditions for Safe Use for ATEX) 3. Application Suitability 4. Description and Principle of Operation 5. Installation of the System 6. Commissioning 7. Maintenance of the System 8. Fault Finding 9. Approval Documents 10. Glossary
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Expo Technologies US T: +1 (440) 247 5314 E:[email protected]
Expo Technologies China T: +86 532 8906 9858 E: [email protected]
Approval / Certification
Europe EN60079-0, EN60079-2 Sira 01ATEX1295X
2813 II 2 (2) G D Ex [pxb] ia IIC T5 Gb Ex [pxb] ia IIIC T100ºC Db Tamb -20ºC +55ºC
IEC IEC60079-0, IEC60079-2 IECEx SIR 07.0027X Ex [pxb] ia IIC T5 Gb Ex [pxb] ia IIIC T100ºC Db Tamb -20ºC +55ºC
Brazil INMETRO - TUV TÜV 12.1462X Ex [pxb] ia IIC T5 Gb Ex [pxb] ia IIIC T100ºC Db -20°C ≤ Ta ≤ +55°C
USA / Canada NFPA 496 FM 1X8A4AE Class I Div 1 Groups A, B, C & D
For limitations and conditions of use refer to the applicable certificate.
MiniPurge Housing
ss = 316L Stainless Steel Neoprene “Top” Mount Gasket pm = Panel Mount (Side/Front Mount) 316L
Stainless Steel
Pressurization Method
CF = Continuous Flow LC = Leakage Compensation
1. Specification Sheet – MiniPurge Type X Systems
Supply Pressure: Must be regulated at inlet Minimum 60 psi / 0.4 MPa / 4 bar Maximum 115 psi / 0.8 MPa / 8 bar Air Quality: Compressed air / Nitrogen to instrument quality Ambient Temperature: -20ºC to + 55ºC Leakage Compensation: Variable up to 2 scfm / 60 Nl/min to compensate for leakage of enclosure Purge Timer: Adjustable between 1 minute and 99 minutes (-0+3 seconds) Flow & Pressure Sensors: CF: One sensor for both “Low Pressure and Flow”: 1” WC / 250 Pa (2.5 mbar) LC: “Low Pressure Sensor” 0.2” WC / 50 Pa (0.5 mbar) “Flow Sensor” 1.13” WC/ 280 Pa / (2.8 mbar) Relief Valve: System: CF LC Model No: RLV25/ss RLV25/FS/ss Opening Pressure: 4” WC / 1 kPa (10 mbar) 4” WC / 1 kPa (10 mbar) Purge Flow Rate: N/A (see Spark Arrestor) 8 scfm / 225 Nl/min Material: 316L Stainless Steel, Spark Arrestor: Stainless Steel mesh, Gasket: Neoprene Spark Arrestor Unit Model No: SAU25 (CF systems only) Purge / Dilution Flow Rate: Between 0.4 & 8 scfm / 10 & 225 Nl/min (Default: 8.0 scfm) 7 user selectable orifice plates Material: Stainless Steel Bulkhead Pipe Fittings: Air Supply: 1/2” NPT Output: 1/2” NPT Signal: 1/8” NPT Visual Indicators: CF: Alarm / Pressurized (Red / Green) Purge Complete (Black / Yellow) LC: Alarm / Pressurized (Red / Green) Purge Complete (Black / Yellow) Action on “Loss of Pressure”: CF & LC: Action on “Loss of Pressure” = “Alarm & Trip” or “Alarm Only”. Both models are user selectable.
Size 1 = Sub MiniPurge Purge flow rate 225 Nl /min, 8 scfm
Purge System Type
07 = MiniPurge
Power & Alarm (Signals)
PO = Pneumatic Output “Power” : On Purge Complete = 30 psi / 0.2 MPa / 2 bar Signal “Alarm” : Loss of Pressure = No signal ”Pressurized” = 30 psi / 0.2 MPa / 2 bar Signal
PA = Power and Alarm Terminal Box Ex e IIC T5 Gb Power and Alarm Terminal Box Ex e IIC T4 Gb “Power” ; 250 Vac 4 Amp AC15 2PNO – Ex d IIC T6 “Alarm” : 250 Vac 4 Amp AC15 SPCO – Ex d IIC T6 (European and IEC Systems Only)
IS = Intrinsically Safe, Ex i & Ex i circuit “Power” : used with others’ Ex i equipment “Alarm” : Relay / Barrier
Model No. (Example): 07 1 XLC / ss / ET / PO / WM (Note: Not all codes are applicable)
Options as Required
AO = Alarm Only MO = Manual Override MK = MIU Mounting Kit (PO systems only) WM = Wall Mounting Bars HP = High Pressure Sensor
ET = Electronic Timer
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2. IECEx Conditions of Certification & (Specials Conditions for Safe Use for ATEX)
When using the AO, AS and DT options, the recommendations for the additional requirements of Ex p apparatus contained within IEC/EN 60079-14 shall be applied. The installer/user shall ensure that the MiniPurge Control Unit is installed in accordance with the equipment certificate that covers the combination of the pressurized enclosure(s) and MiniPurge Control Unit. The values of the safety parameters shall be in accordance with the equipment certificate that covers the combination of the pressurized enclosure and MiniPurge Control Unit. This MiniPurge Control Unit shall be incorporated into equipment and the appropriate Conformity Assessment Procedures applied to the combination (as defined by Directive 94/9/EC). This certificate does not cover the combination. The purge controller, low temperature version, shall be protected by a safety related system that ensures that it cannot be energised if the temperature of the air inlet or purge controller falls below -20ºC. This system shall utilise the RTDs that are fitted to the purge controller to provide the appropriate level of system integrity, (i.e. a level of operational safety of Cat 3 according to EN 954-1 for ATEX Category 2 Zone 1 applications); note that these RTDs have not been assessed as a safety related device (in accordance with EHSR 1.5 of the Directive 94/9/EC).
3. Application Suitability
MiniPurge Systems are certified for use in Hazardous Areas, where the Hazardous Area is non-mining (i.e. above ground) and the hazard is caused by flammable gasses, vapours or dust. Depending on the model, the systems may be used in IECEx, ATEX Zone 1(21) - Category 2 and NEC 500 Class I, Div 1.
MiniPurge systems may be used for hazards of any gas group. However, apparatus
associated with the MiniPurge system, such as Intrinsically Safe signalling circuits and flameproof enclosures containing switching devices may be limited in their gas group. The certification documentation supplied with any such devices must be checked to ensure their suitability. This system is designed for use primarily with compressed air. Where other inert compressed gasses are used (Nitrogen, for example) the user must take suitable precautions so that the build up of the inert gas does not present a hazard to health. Consult the Control of Substances Hazardous to Health (COSHH) data sheet for the gas used. Where a risk of asphyxiation exists, a warning label must be fitted to the Pressurized Enclosure.
The following materials are used in the construction of MiniPurge systems. If substances that will adversely affect any of these materials are present in the surrounding environment, please consult Expo for further guidance. Materials of construction:
• Stainless Steel • Aluminium • Acrylic • Polycarbonate
• Mild (carbon) Steel • Nylon • Silicone Rubber • ABS
• Brass • Polyurethane • Neoprene • Glass Filled Polyester
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4. Description and Principle of Operation
All Expo Technologies MiniPurge pressurization systems provide: a) a method of pressurizing a Pressurized Enclosure (PE) while at the same time compensating for any leakage, together with b) a method of purging the enclosure, before power is applied, to remove any flammable gas that may have entered the enclosure while it was not pressurized,
c) visual indication of the MiniPurge system status, and d) an output to provide remote indication or control.
The MiniPurge system comprises a number of component units. The units required depend on the type of system selected. These are summarised in Table 1. The general description and function of each is as follows: 4.1 Control Unit (CU) The Control Unit (CU) is the heart of the system. It contains a pneumatic logic circuit specially designed and built to control the functions required for purge and pressurization. For all systems this includes air filtration, pressure and purge flow measurement, electronic purge timing, and local visual indication of Pressurized/Alarm and flow sensed. It also provides the outputs for power and remote alarm control corresponding to the output type selected. 4.2 Relief Valve (RLV)
The Relief Valve unit is fitted to the PE to provide a means of limiting the maximum pressure experienced by the PE during operation. The RLV model number has a suffix giving the diameter of the valve aperture in millimetres e.g. RLV25 (= 25mm bore). The RLV also incorporates a Spark Arrestor to prevent sparks being ejected from the PE into the classified area. In Leakage Compensation systems, the RLV is combined with the flow measurement mechanism.
Figure 1. LC Relief Valve
4.3 Calibrated Outlet Orifice/Spark Arrestor (SAU) Continuous Flow systems incorporate the SAU25. This unit has a range of interchangeable calibrated orifice plates, which are used to measure the flow through the PE.
Figure 2 Spark Arrestor Type SAU25
4.4 The Methods of Pressurizing a) CF - Continuous Flow A Continuous Flow (CF) of protective gas is passed through the PE. Initially this flow is verified and performs the purging phase of the operation. When the purging phase is completed – i.e. the purge time has elapsed- the same flow of protective gas maintains the pressurization of the enclosure. This flow may be required to dilute an internal source of hazardous gas release.
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D.P. HI /
"OR"
GATE
'PURGE
COMPLETE'
VALVE
B
A
PURGE OUTLET TO
ENCLOSURE PRESSURE
TEST POINT (PLUGGED)
IN-LINE RESTRICTOR
LOGIC
GAUGE
PRESSURE
REGULATOR
2 barg
30 psi
D.P. LO /
MINIMUM PRESSURE /
FLOW SENSOR
ALARM INDICATOR 1
RED = ALARM
GREEN = PRESSURIZED
FILTER
t
PURGE FLOW
SENSORTIMER
VALVE
PURGE SUPPLY
AIR OR INERT
GAS
PURGE
INDICATOR 2
YELLOW =
PURGING
Figure 3 Continuous Flow Circuit Diagram
b) LC - Leakage Compensation Initially a high flow of protective gas is passed through the enclosure. This flow is verified and performs the purging phase of the operation. When the purging phase is completed – i.e. the purge time has elapsed - the flow of protective gas is provided via an adjustable valve so that it just compensates for any leakage from the PE in addition to maintaining its pressurization. If leakage is less than 5 l/min then the LCV will be awkward to set. You will find that the RLV spring will cycle open and closed. If this happens contact our service department for advice.
'PURGE
COMPLETE'
VALVE
ENCLOSURE
PRESSURE
TEST POINT
(PLUGGED)
D.P. HI / ENCLOSURE PRESSURE
PURGE OUTLET TO PRESSURIZED ENCLOSURE
PURGE VALVE
PILOT RESTRICTOR
LOGIC GAUGE
PRESSURE
REGULATOR
2 barg
30 psi
"OR"
IN-LINE RESTRICTOR
GATE
PURGE
VALVE
LEAKAGE
COMPENSATION
VALVE
TIMER
VALVE
D.P. LO / RLV CONNECTION
ALARM
INDICATOR 1
RED = ALARM
GREEN =
PRESSURIZED
PURGE
INDICATOR 2
YELLOW =
PURGING
ALARM
& TRIP
SENSOR
MINIMUMPRESSURE
ALARM ONLY (OPTION)
AIR OR INERT
GAS
FILTER
t
PURGE FLOW
SENSOR
ELECTRONIC
TIMER
B
A
Figure 4 Leakage Compensation Circuit Diagram
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4.5 Type of Output The functions of the outputs are power control and alarm/pressurized indication. Power control provides a signal to switch the power to the PE. Alarm output provides a passive signal to indicate remotely when the enclosure is not pressurized and an active signal when pressurized. a) PO- Pneumatic Output The power control and pressurized outputs are pneumatic signals, which may be used to operate other devices to provide power switching or alarm indication. The lack of any output signal indicates incomplete purge and alarm. In many instances these outputs may be
connected to the Expo range of MiniPurge Interface Unit s (MIU).
b) IS - Intrinsically Safe Output The power control and alarm outputs are volt free contacts which form part of an Intrinsically Safe (IS) circuit which then provides power control or alarm outputs in a safe (unclassified) area. These contacts must only be connected to IS circuits as the switch contacts are in the hazardous area. In many instances these outputs may be connected to the Expo range of
MiniPurge Interface Units (MIU).
Figure 5 Pneumatic Output Option - Typical MiniPurge Interface Unit type (MIU/dA)
A
"PURGE COMPLETED"
2 bar
30 psi
200 kPa
POWER SUPPLY
B
"Ex" ENCLOSURESPOWER TO
PRESSURIZED ENCLOSURE
COMMON
PRESSURIZED
"PRESSURIZED"
2 bar
30 psi
200 kPa
POWER SWITCH
PASSIVE
ALARM / PRESSURIZED
SWITCH
Figure 6 Intrinsically Safe (IS) Option
B
M/O
2
+
PRESSURIZED
LOW PRESSURE ALARM
PASSIVE
ALARM / PRESSURIZED
SWITCH COMMON
POWER TO
POWER
SWITCHPOWER SUPPLY
A
+
1
I.S. SWITCH PCB
I.S. INTERFACE UNITSINTRINSICALLY SAFE CIRUITS
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c) PA - Power and Alarm
The terminal box is Increased Safety (Ex e) certified and incorporates the terminal connection points for the alarm and interlock circuits. All contacts provided are volt free (dry). Cable entry methods (for example conduit or cable glands) must be certified to IECEx, ATEX or INMETRO standards. The main requirement is that IP66 (or better) ingress protection must be provided by use of seals or washers.
d) HP – High Pressure Sensor If the pressure in the pressurized enclosure rises above the setting of the High Pressure sensor, the controller resets cutting the power to the enclosure. On detecting the overpressure an optional facility is available for the generation of an alarm or indicator. On systems with High Pressure sensor, the relief valve may be omitted.
POWER TO
PRESSURIZED
ENCLOSURE
A
"PURGE COMPLETED"
2 bar
30 psi
200 kPa
B
PRESSURE
ALARM
CONTACTS
ALARM / PRESSURIZED
ACTUATOR AND SWITCH
POWER SUPPLYLIVE1
2
3
4
5
6
7
EEx e II JUNCTION BOXMINIPURGE"PRESSURIZED"
2 bar
30 psi
200 kPa
BOTH SWITCHES:
CONTACTS 250Vac 4A AC14
NEUTRAL
LIVE
NEUTRAL
POWER ACTUATOR
AND SWITCH
Figure 7. Ex de Power and Alarm (PA) Option
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5. Installation of the System
This MiniPurge is designed for use under normal industrial conditions of ambient temperature, humidity and vibration. Please consult Expo before installing this equipment in conditions that may cause stresses beyond normal industrial conditions.
The MiniPurge system shall be installed in accordance with relevant standards, such as IEC / EN 60079-14, NEC 500, NFPA 496 and any local codes of practice that are in force.
There are up to three components for the MiniPurge system, dependent upon the system type:
System type Control Unit (CU) Relief Valve (RLV)
Spark Arrestor Unit
Leakage Compensation YES YES Integral to RLV
Continuous Flow YES YES YES (SAU25)
Table 1 System Components
5.1 Control Unit (CU)
The MiniPurge system should be installed either directly on or close to the PE. See mounting details. Generally the most convenient arrangement is to install the CU on the top of the PE.
Must be mounted vertically as shown in MiniPurge Configuration XBR-7TD0-003. The CU can be mounted on the side of the PE using the rear mounting fixings. The piped connections to the PE should be made using metallic tube through suitable bulkhead connections. The CU can be remote mounted using the wall mounting bars (/WM option), and should be installed as close as possible to the PE. It should be installed so that the system indicators and certification labels may be readily observed. 5.2 Relief Valve (RLV) and Spark Arrestor Unit (SAU) To achieve efficient purging the points where air enters and exits the PE should normally be at opposite ends of the PE. These items must be mounted vertically. The RLV or SAU are recommended to be situated at the bottom, or on the side of the enclosure at the bottom, when the CU is top mounted on the enclosure, thus achieving top to bottom purging. The purge air may be piped within the PE to ensure purging of potential dead air spots. It is important that the interior and exterior of the Spark Arrestor is kept clean and debris is not allowed to accumulate which might affect the calibration of the device. In particular the exterior of the Spark Arrestor should not be painted or blocked off in any way. 5.3 Connections to Protective Gas Supply The MiniPurge® system should be connected to a protective gas supply, which is suitable for purging and pressurization. The supply pipe connection to the MiniPurge® must be appropriate for the maximum input flow rate for the application. The air supply must be regulated at a pressure less than the maximum stated inlet pressure. The air supply must be: clean, non-flammable and from a non-hazardous location. The air should be of Instrument Air Quality. Although the purge control system will operate with lower air quality, its operational life will be adversely affected. The equipment that is being protected by the MiniPurge® may also suffer because of poor air quality.
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With reference to BS ISO 8573-1: 2010, Instrument Air is typically specified as: Particle Class 1 In each cubic metre of compressed air, the particulate count should not exceed 20,000 particles in the 0.1 to 0.5 micron size range, 400 particles in the 0.5 to 1 micron size range and 10 particles in the 1 to 5 micron size range. Humidity or pressure dew point The dew point, at line pressure, shall be at least 10 °C below the minimum local recorded ambient temperature at the plant site. In no case, should the dew point at line pressure exceed +3 °C. Oil Class 2
In each cubic metre of compressed air, not more than 0.1mg of oil is allowed. This is a total level for liquid oil, oil aerosol and oil vapour. When an inert gas is being used to supply the purge system, risk of asphyxiation exists. Refer to Application Suitability section.
Before connection of the air supply to the purge system, the supply pipe work should be flushed through with instrument quality air to remove any debris that may remain in the pipes. This must be carried out for at least 10 seconds for every meter of supply pipe.
Unless a supply shut-off valve has been fitted to the MiniPurge® system, an external shut-off valve with the same, or larger, thread size as the Control Unit inlet fitting should be fitted by the installer to prevent any restriction of purge flow.
The purge air from the MiniPurge® Control Unit should be piped within the pressurized enclosure to ensure purging of potential dead air spots. The purge system is fitted with an internal regulator factory set to 3 bar feeding the logic. 5.4 Purge Air from CU to PE When the CU is mounted directly on the top of the PE, no connection will normally be necessary, as the purge air will discharge into the PE directly. When the CU is not mounted on the top, or where internal air distribution is necessary a connection should be made from the purge air outlet on the CU (normally ½” NPT Female), via pipe pressure rated at least to the supply pressure, to the PE. This should be kept as short as possible and should be adequately sized to ensure that the full purge flow can be delivered. 5.5 CU to Enclosure Pressure Monitor When the CU is mounted on the top of the PE, no connection will normally be necessary, as the enclosure pressure monitor point will sense directly inside the PE. If the CU is not directly mounted or if there are fans, which may create localised low-pressure areas within the PE, it is necessary to pipe this connection. The connection is made to the enclosure pressure sensor fitting (normally 1/8” NPT Female) on the CU. There is virtually no flow in this circuit, so small bore tube may be used. Expo recommends 6mm O/D metal tube. Make sure that all connections are free of leaks.
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5.6 CU to Flow Sensor In Continuous Flow (CF) systems, a Differential Pressure Sensor is combined with the Minimum Pressure Sensor and measures the "DP HI (High) / Enclosure Pressure" within the PE and the pressure in the monitoring device at the back of the SAU "DP LO (Low) SAU Connection". This connection requires a pipe connection between the CU and the SAU25. In Leakage Compensation (LC) systems a dedicated Purge Flow Sensor measures the differential pressure between the "DP HI (High) / Enclosure Pressure" and the pressure in the monitoring device at the back of the RLV "DP LO (Low) RLV Connection". This connection requires a pipe to connect the CU to the RLV25. 5.7 Power Supplies and their Isolation All power entering the PE shall be provided with a means of isolation. This requirement also applies to any external power sources, which are connected to equipment such as "volt-free" or “dry" contacts within the PE. Printer signal, network cards, etc need isolation. Exception: Power to other apparatus that is already suitable for the hazardous area need not to
be isolated by the MiniPurge system.
In all cases the application and the isolation of the power must be controlled by the MiniPurge system. Refer to Specification Sheet for output options available. 5.8 Adjustments and Settings Purge Time If no specific purge test has been performed on the PE, the volume of the PE must be determined by the manufacturer or user and the necessary purging time calculated based on the purge flow rate specified by the “standard” being used. It is the user's responsibility to verify
or enter this data on the PE and/or MiniPurge system nameplate. Ask Expo if in doubt. The IEC / EN 60079-2 permits 5 free volume changes and an example of the calculations is as follows:
If the PE external dimensions indicate an internal free volume of 500 Litres then, 500 litres enclosure volume x 5 volume changes = 12 minutes purge time
225 litres/minute purge flow rate If the PE is a motor, experience of purge testing shows that it is prudent to multiply the motor internal "free” volume by ten to get the purging volume.
500 litres enclosure volume x 10 volume changes = 23 minutes purge time 225 litres/minute purge flow rate
The following applies for NFPA 496 standards where 4 complete volume changes are permitted for enclosures except when the PE contains a motor when 10 volume changes are required.
If the PE external dimensions indicate a total volume of 8 cubic foot, then, 8 cubic foot enclosure volume x 4 volume changes = 4 minutes purge time
8 cubic foot/minute purge flow rate, (see above) If the same PE contains a motor, then,
8 cubic foot enclosure volume x 10 volume changes = 10 minutes purge time 8 cubic foot/minute purge flow rate, (see above)
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The standard MiniPurge units have an adjustable electronic timer
system as shown in Figure 8 MiniPurge Time Selector Switches. The purge time is set by adjusting the Time Selector Switches so that the time equals or exceeds the required purge time. If the time is set to ‘00’, the purge time will be indefinite.
Figure 8 MiniPurge Time Selector Switches
Purge Flow Rate (Orifice Size Selection) – Only for CF Systems The purge flow rate is selected by placing the appropriate orifice plate in the SAU. The purge flow rates given in Table 2 are based on standard setting of the flow sensor of 2.5mbar, 1” WC, 250Pa. For LC systems the purge flow rate is set by the selection of the RLV and is not user adjustable.
Orifice Plate Number
Continuous Flow Rate with 2.5 mbarg, 1” WC, 250 Pa
flow sensor set point
N litre/minute SCFM
A 10 0.4 B 25 0.9 C 40 1.4 D 65 2.3 E 90 3.2 F 135 4.8 G 180 6.4
NO ORIFICE 225 8.0 Table 2 Purge Flow Rates
Action on Loss of Pressurization The action on loss of pressurization is the responsibility of the user. The action on loss of pressurization can be set to ALARMS ONLY (AO), or ALARM AND AUTOMATIC DISCONNECT OF POWER (A&T). For both Leakage Compensation and Continuous Flow systems, the action on loss of pressurization is set by moving the jumper tube (see Figure 10 Action on Loss of Pressurization Jumper Tube). The standard setting is Alarm and Trip where the link is from C to A&T, with a plug in AO. Changing to Alarm Only (AO) is user adjustable by moving the link from C to AO, and plugging A&T.
Figure 9 Action on loss of pressurization jumper tube
The selection for action on loss of pressurization depends on the area of operation and the following guidelines should be followed. The user must make use of this alarm facility in accordance with the local code of practice for "action on pressure or flow failure". Most codes include the following recommendations:
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Zone 1 Installations: Alarm and automatic disconnect of power. Exception: If the equipment inside the PE is suitable for use in Zone 2, the power trip may be performed manually, (no automatic power trip), if the pressure or flow failure persists for an unacceptable time. Zone 2 Installations: Alarm Only on pressure or flow failure with power being removed manually by turning off the air
supply to the MiniPurge system if the failure persists for an unacceptable time. Class I Division 1 Installations: Alarm and Automatic Trip of Power. Note: NFPA 496 states power to the circuits shall be permitted to be continued for a short period if immediate loss of power would result in a more hazardous condition and if both audible and visual alarms are provided at a constantly attended location. Class I Division 2 Installations: Where automatic timing is preferred, Alarm Only on pressure or flow failure with power being
removed manually by turning off the air supply to the MiniPurge system if the failure persists for an unacceptable time. 5.9 Internal Gas Release If the PE contains an internal source of release of flammable gas or vapour, the procedures for assessment of the release as given in NFPA 496 or IEC / EN 60079-2 should be used. Expo is pleased to provide assistance or consultancy and advice on such matters. The user must verify that the specifications of the Expo system e.g. pressure, continuous flow (dilution) rate and type of protective gas are correct for the specific application. 5.10 Multiple Enclosures More than one PE can be protected by a single system. Where PEs are connected and purged in "series" e.g. "Daisy Chained", the RLV and when using a CF system, the SAU25 should be fitted on the last enclosure with the Purge Inlet connected to the first enclosure. The bore and length of the pipe or conduit used to interconnect the enclosures is critical and will determine the maximum pressure experienced by the first enclosure in the series. Advice on sizing can be obtained from the Expo sales office but in general terms when using RLV25 or SAU25, the pipe bore size should not be less than 25mm (1”). A common fault of installing small bore pipe leads to over pressurizing of all but the last enclosure. PEs should not be connected in parallel.
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6. Commissioning
Start by check that the system has been installed in accordance with this manual.
Disconnect the supply pipe from the inlet to the MiniPurge system and blow it through for at least 10 seconds per meter (3ft) of length to remove any debris or condensation. Connect a temporary pressure gauge or water manometer to
the PE or MiniPurge system pressure test point (Remove the red plug on the low pressure sensor and connect 4mm OD nylon tube).
Figure 10. PE or MiniPurge system pressure test point
Unless a supply shut-off valve has been specially fitted inside the MiniPurge system, it may be advisable to install an external shutoff valve with the same, or larger, thread size as the
MiniPurge CU inlet fitting upstream of the connection. 6.1 Continuous Flow (CF) Systems Open the Flow Control Valve (FCV) until the alarm/pressurized indicator just turns from red to green. Clockwise will reduce the flow and anti-clockwise will increase the airflow. If the FCV is opened fully and the indicator has still not turned green, check the air supply pressure at the inlet to the control unit while flow is taking place. It must be above the minimum 4 bar/ 60 psig/ 400kPa specified.
Check that the internal logic gauge reads 2bar /30 psig/200kPa. The electronic purge timer will start as soon as the ‘alarm/pressurized’ indicator turns from red (alarm) to green (pressurized). Check that the time delay between the indicator flashing yellow and the application of power to the PE is not less than the minimum time required to purge the PE. When the purge time has been completed, the ‘purge complete’ indicator will stop flashing. After the power has been turned on by the CU, the air flow will continue at the same rate to provide dilution as required.
Figure 11. Flow Control Valve (FCV)
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6.2 Leakage Compensation Systems (LC)
• Open the Leakage Compensation Valve (LCV) fully, turn anti-clockwise.
Clockwise will reduce the flow and anti-clockwise will increase the airflow.
• Open the supply regulator SLOWLY and allow the PE pressure to rise until the RLV opens.
• Check that the RLV opens at or below the figure specified in the documentation.
RLV tolerance of +0, -20% of default setting.
• Repeat the test several times.
Figure 12 Leakage Compensation Valve
• Open the supply regulator to between 4 and 8 barg / 60 and 115 psi / 400 and 800 kPa and the purging flow will start.
• Check that the internal logic gauge reads 2 bar /30 psi / 200 kPa At this time the "alarm/pressurized” indicator should be green and the "purging” indicator should be flashing yellow. If the “purging” indicator remains black the flow through the RLV is below the minimum for which the flow sensor has been calibrated. Check the air supply pressure at the inlet to the control unit while purging is taking place. It must be above the minimum specified. The electronic purge timer will start as soon as the "purging" indicator starts flashing yellow. Check that the time delay between the “purging” indicator flashing yellow and the application of power to the PE is not less than the minimum time required purging the PE. Times in excess of the minimum are permitted. If the time is too short it must be increased accordingly. After the power has been applied via the CU, the purging valve will close and the air flow into the enclosure will be controlled by the LCV. The initial setting of fully open will normally be too high. It should now be adjusted to set the PE pressure and leakage. There are three possible situations:
Air continues to come out through the RLV Spark Arrestor after power has been applied in considerable quantity. The LCV is much too far open and the air flow is holding the RLV open continuously. Close the LCV slowly. The PE pressure will start to fall as the flow decreases but eventually the RLV will close and the enclosure pressure rise again. At this point the RLV may start to open intermittently as the PE pressure rises to the point where it exceeds the RLV opening pressure. When the RLV opens the pressure will fall quickly to the point where the RLV re-closes and the enclosure pressure starts to rise again. This is entirely normal for this type of RLV.
If the RLV is opening intermittently the LCV is slightly too far open. When the RLV opens the enclosure pressure falls quickly to the point where the RLV re-closes and the enclosure pressure starts to rise again. This is entirely normal for this type of RLV and shows that it is working correctly. Continue then to close the LCV until the cycling stops and the enclosure pressure starts to fall. Carefully adjust the LCV until the PE pressure is approximately 50% of the RLV opening pressure and stable. This pressure may be around 5 mbarg / 2” WC / 500 Pa and will be the "normal working pressure".
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ML442 | v19
Expo Technologies UK T: +44 (0) 20 8398 8011
Expo Technologies US T: +1 (440) 247 5314
Expo Technologies China T: +86 532 8906 9858
We recommend that the setting of the minimum pressure sensor be checked at this time. Note the position of the LCV knob. (A pencil mark placed on the knob at “12 O'clock” can be used). Slowly lower the PE pressure by closing the LCV further, counting the number of turns from the "normal working pressure" position. Note the pressure at which the "alarm/pressurized" indicator turns from green to red and check that it is not lower than the figure given in the documentation. Check also the "alarm" electrical contacts. As soon as the "alarm/pressurized" indicator turns red, the system will start to re-purge. If Alarm and Trip function is selected the enclosure power will be switched off. While it is re-purging return the LCV to its "normal working pressure" position so that, at the end of purging, the enclosure pressure should immediately settle down at the correct "normal" pressure.
If, at the end of purging, the PE pressure falls below the minimum pressure sensor setting and the LCV is fully open, the system will start to purge again. This is indicative of excessive leakage from the enclosure. In this case, check the enclosure for leakage, and reduce or eliminate the leaks. This time, at the end of purging, the enclosure should stay pressurized and the RLV action is as in a) or b) above. Proceed as described above.
6.3 Normal operation Turn the air supply on or off to start or stop the system. After this the pressurizing and purging sequence is entirely automatic 6.4 High Pressure Valve This valve is set at Expo and should not be changed. The function of this valve is to set the delay time of the purge system restarting after the maximum HP sensor pressure is reached.
ML442 | v19 Page
15 Expo Technologies UK T: +44 (0) 20 8398 8011 E: [email protected]
Expo Technologies US T: +1 (440) 247 5314 E:[email protected]
Expo Technologies China T: +86 532 8906 9858 E: [email protected]
7. Maintenance of the System
The maintenance recommended for the system consists of the following items, supplemented by any additional local requirements imposed by the local Code of Practice. Expo recommends that the commissioning tests be repeated at least every six months. In addition, the following checks are also recommended at that time:
• Check the RLV and all Spark Arrestors. Remove all debris & corrosion or replace with a spare.
• Check the condition of the air supply filter element. Clean or replace it as necessary.
At least every two years check the following additional items:
• Apparatus is suitable for the Hazardous Location
• There are no unauthorised modifications
• The air supply must be to the correct quality, refer to section Air Quality
• The interlocks and alarms function correctly
• Approval labels are legible and undamaged
• Adequate spares are carried
• The action on pressure failure is correct The Intrinsically Safe Battery Pack should be changed at least every three years, and the commissioning tests repeated. After the timing phase has elapsed, the battery may be ‘hot-swapped’ in a hazardous environment without effecting the operation of the MiniPurge Ex px system. Recommended spares ETM-IS31-001 Intrinsically Safe Battery Pack Pressure sensor calibration If it is decided that the minimum pressure /purge flow sensor needs recalibrating it must be returned to Expo for this service. Filter cleaning If the filter element needs cleaning the filter bowl can be unscrewed and removed. The filter element also unscrews and can then be cleaned in soapy water. Do not use solvents on any part of the filter assembly.
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ML442 | v19
Expo Technologies UK T: +44 (0) 20 8398 8011
Expo Technologies US T: +1 (440) 247 5314
Expo Technologies China T: +86 532 8906 9858
8. Fault Finding
If the system does not behave in the manner described above, there is a fault. Some of the more likely faults are dealt with below. If a cure cannot be affected by following the procedure shown below, please call Expo (24 hour answering) or your supplier for further assistance. The system has been designed for ease of fault finding and the many of the components fitted are plug-in or manifold mounted. Check components by substitution only after establishing that such action is necessary. If the system is less than 12 months old, parts under warranty should be returned to Expo for investigation, with a full report of the fault and the system serial number. As with any pneumatic system the greatest enemies are water, oil and dirt in the air supply. For this reason, the air system must always incorporate a dust and water filter. This can be part of the Expo system or can be provided by others. However, dirt can enter from other sources and it is vital therefore that the procedures described in Section 2 is carried out before using the system for the first time, or following any disconnection of the pipe-work. Failure to perform this work may cause damage that will not be covered under warranty. Before making the following checks verify that both the main air supply pressure to the purge system & the regulated pressure to the logic are as specified on the system specification sheet. Different flow charts for faulting have been provided for both the CF and LC options.
ML442 | v19 Page
17 Expo Technologies UK T: +44 (0) 20 8398 8011 E: [email protected]
Expo Technologies US T: +1 (440) 247 5314 E:[email protected]
Expo Technologies China T: +86 532 8906 9858 E: [email protected]
Fault Finding (CF)
Is the PE strong enough?
Is the Pressure / Flow Sensor out of calibration or
faulty?
Pressurized indicator will not turn green or Purging indicator will not flash yellow
Call Expo
Is the supply pipe to the air inlet as least 12mm I.D?
Is there excessive
leakage from the PE?
Is the air supply pressure incorrect?
No
Check the air supply pressure at the inlet to the MiniPurge is stable between 4 - 8 Barg / 60 - 115 psi
Yes
Replace pipe work
No
Yes
Any significant leakage must be corrected. Check for leaks down the cables or conduit. Ensure leakage does not exceed 60 Nl/min (2 cfm)
Yes
No
Yes
No
The standard requires that the PE is tested to 1.5 times the Relief Valve opening pressure e.g. 15 mbarg for many systems. Has this been done?
No
The basic operation of the Pressure Sensor can be checked by unscrewing the 60mm diameter diaphragm housing and, by using a rubber pad, e.g. an eraser, block the 12mm threaded hole in the top of the valve module. The valve should operate and the indicator turns green. If this is correct, the sensor diaphragm needs recalibrating or replacing.
Yes
Page 18
ML442 | v19
Expo Technologies UK T: +44 (0) 20 8398 8011
Expo Technologies US T: +1 (440) 247 5314
Expo Technologies China T: +86 532 8906 9858
For PO option only Is there pressure at the
power switch output bulkhead and at the power switch? Is the power switch OK?
Is the Purge time correct?
System fails to switch power on after the purge time has
elapsed.
Call Expo
Has the purge time completed
its course?
Is Power available?
No
Yes
Check the small indicator button
on the timer valve. When the valve has timed
out, it should return out when
depressed.
No
Yes
Yes
Check if the external Power Switch contacts close at 1.4 Barg
No
Note the timer setting. Reset the timer to the minimum available purging period and check
the operation on that purge time. Ensure that the purge time is returned to its original setting and checked before putting the system back into service.
No
For PO option only Is the tube to the power switch air
tight?
Ensure fitting nuts are tightened and that the tube is not damaged. Check and repair as necessary.
No
Yes
Yes
Is Power isolator closed?
No
Yes
Yes
Are the fuses or circuit breaker?
OK?
No
ML442 | v19 Page
19 Expo Technologies UK T: +44 (0) 20 8398 8011 E: [email protected]
Expo Technologies US T: +1 (440) 247 5314 E:[email protected]
Expo Technologies China T: +86 532 8906 9858 E: [email protected]
Is the Pressurized Enclosure
pressure too high?
Is there debris on the RLV disk allowing air to leak from the
valve?
Relief Valve opens
continuously or intermittently.
Call Expo
Remove the RLV cover and clean the valve
disk. If it is necessary to remove the disk and spring from the RLV, draw a line around it with a pencil to allow accurate replacement
before removal, otherwise the opening
pressure may be affected.
The Flow Control Valve (FCV) is too far open.
Adjust the FCV clockwise to reduce the
PE pressure
No
Yes
No
Yes
Page 20
ML442 | v19
Expo Technologies UK T: +44 (0) 20 8398 8011
Expo Technologies US T: +1 (440) 247 5314
Expo Technologies China T: +86 532 8906 9858
Fault Finding (LC)
Is the actual PE pressure below
the setting of the Minimum
Pressure Sensor?
Is the Leakage Compensation
Valve setting too low causing the
MiniPurge to auto-repurge?
System purges correctly but
the alarm comes on at the end of purge time and the purging
cycle is repeated.
Call Expo
Increase the PE pressure by turning the Leakage Compensation
Valve anti-clockwise.
Check the PE pressure with a manometer or
gauge.
Yes
No
Yes
No
Yes
ML442 | v19 Page
21 Expo Technologies UK T: +44 (0) 20 8398 8011 E: [email protected]
Expo Technologies US T: +1 (440) 247 5314 E:[email protected]
Expo Technologies China T: +86 532 8906 9858 E: [email protected]
Is the tube between the RLV tapping and flow sensor air tight?
Is the PE strong enough?
Is the Purge Flow Sensor out of calibration or
faulty?
Purging indicator will not flash "Yellow" during
Purging.
Call Expo
Is the supply pipe to the air inlet as least 12mm I.D?
Is there excessive
leakage from the PE?
Is the air supply pressure incorrect?
No
Check the air supply pressure at the inlet to the MiniPurge is stable between 4 - 8 Barg / 60 - 115 psi
Yes
Replace pipe work
No
Yes
Any significant leakage must be corrected. Check for leaks down the cables or conduit. Ensure leakage does not exceed 60 Nl/min (2 cfm)
Yes
No
No
The standard requires that the PE is tested to 1.5 times the Relief Valve opening pressure e.g. 15 mbarg for many systems. Has this been done?
No
The operation of the Purge Flow Sensor can be checked by carefully removing the insulated female spade crimp terminals* on the underside of the hexagonal sensor. A wire link across them should operate the Electronic Timer and the ‘purging’ indicator flash yellow. If this is correct, the sensor diaphragm needs recalibrating or replacing, if not, replace the I.S. Battery Pack.
Yes
Ensure fitting nuts are tightened and that the tube is not damaged. Check and repair as necessary.
No
Yes
Yes
*Note: When replacing the terminals it is very important to ensure they are fully sealed by the terminal gasket.
Page 22
ML442 | v19
Expo Technologies UK T: +44 (0) 20 8398 8011
Expo Technologies US T: +1 (440) 247 5314
Expo Technologies China T: +86 532 8906 9858
For PO option only Is there pressure at the
power switch output bulkhead and at the power switch? Is the power switch OK?
Is the Purge time correct?
System fails to switch power on after the purge time has
elapsed.
Call Expo
Has the purge time completed
its course?
Is Power available?
No
Yes Check the small indicator button on the timer valve. When the valve has timed out, it should return out when depressed.
No
Yes
Yes
Check if the external Power Switch contacts close at 1.4 Barg
No
Note the timer setting. Reset the timer to the minimum available purging period and check the operation on that purge time. Ensure that the purge time is returned to its original setting and checked before putting the system back into service.
No
For PO option only Is the tube to the power switch air
tight?
Ensure fitting nuts are tightened and that the tube is not damaged. Check and repair as necessary.
No
Yes
Yes
Is Power isolator closed?
No
Yes
Yes
Are the fuses or circuit breaker?
OK?
No
ML442 | v19 Page
23 Expo Technologies UK T: +44 (0) 20 8398 8011 E: [email protected]
Expo Technologies US T: +1 (440) 247 5314 E:[email protected]
Expo Technologies China T: +86 532 8906 9858 E: [email protected]
Is the Pressurized Enclosure
pressure too high?
Is there debris on the RLV disk allowing air to leak from the
valve?
Relief Valve opens
continuously or intermittently.
Call Expo
Remove the RLV cover and clean the valve
disk. If it is necessary to remove the disk and spring from the RLV, draw a line around it with a pencil to allow accurate replacement
before removal, otherwise the opening
pressure may be affected.
The Leakage
Compensation Valve (LCV) is too far open.
Adjust the LCV clockwise to reduce the
PE pressure
No
Yes
No
Yes
Page 24
ML442 | v19
Expo Technologies UK T: +44 (0) 20 8398 8011
Expo Technologies US T: +1 (440) 247 5314
Expo Technologies China T: +86 532 8906 9858
9. Approval Documents
Certificates can be found in the accompanying booklet (ML499) or download the certificates at www.expoworldwide.com/downloads.
Component Certificate Certificate Number
MiniPurge IECEx Certificate IECEx SIR 07.0027X
ATEX Certificate 01ATEX1295X
INMETRO/TÜV TÜV 12.1462X
FM Certificate 1X8A4.AE
Electronic Timer IECEx Certificate FME 10.0001X
ATEX Certificate 10 ATEX0003X
For PA Option Only Certificate Certificate Number
Ex e junction box IECEx Certificate IECEx EXV 19.0057X
ATEX Certificate ExVeritas 19 ATEX0542X
INMETRO/TÜV TÜV 12.1463
Ex d switches IECEx Certificate IECEx EPS 14.0092X
ATEX Certificate EPS 14 ATEX 1 766 X
10. Glossary
Acronym Description
A&T Alarm and Trip
AO Alarm Only
CF Continuous Flow
CU Control Unit
FCV Flow Control Valve
FM Factory Mutual
IS Intrinsically Safe
LC Leakage Compensation
LCV Leakage Compensation Valve
MIU MiniPurge Interface Unit
PA Ex d Power and Alarm Switch Wired to Ex e terminal box
PE Pressurized Enclosure
PO Pneumatic Output
RLV Relief Valve
SAU Spark Arrestor Unit
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FIN
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ME
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EE
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SU
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TW
16 5
DB
UN
ITE
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ING
DO
M
DR
AW
ING
No.
SC
ALE
The
cont
ents
of t
his
draw
ing
/ doc
umen
t are
Cop
yrig
ht ã
Exp
o Te
chno
logi
es L
imite
d. T
hey
are
to b
e tre
ated
as
conf
iden
tial a
nd a
re re
turn
able
upon
requ
est.
The
y ar
e no
t to
be c
opie
d or
com
mun
icat
ed in
par
t or i
n w
hole
with
out w
ritte
n co
nsen
t fro
m E
xpo
Tech
nolo
gies
Lim
ited,
nei
ther
are
they
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3rd
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PR
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DIM
EN
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IN m
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NO
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Expo
Tec
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JOB
No:
FIN
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CU
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UN
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No.
SC
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The
cont
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of t
his
draw
ing
/ doc
umen
t are
Cop
yrig
ht ã
Exp
o Te
chno
logi
es L
imite
d. T
hey
are
to b
e tre
ated
as
conf
iden
tial a
nd a
re re
turn
able
upon
requ
est.
The
y ar
e no
t to
be c
opie
d or
com
mun
icat
ed in
par
t or i
n w
hole
with
out w
ritte
n co
nsen
t fro
m E
xpo
Tech
nolo
gies
Lim
ited,
nei
ther
are
they
to b
e us
ed in
any
way
aga
inst
our
inte
rest
s.
NO
DE
C P
LAC
E ±
0.5
1 D
EC
PLA
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±0.
22
DE
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TERM
INALS
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UN
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N3rd
AN
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DO
NO
T S
CA
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Exp
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ech
no
log
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imit
ed
JOB
No:
FIN
ISH
TIT
LE
CU
STO
MER
:
SH
EET N
o.
OF
1
DIM
EN
SIO
NS
IN
mm
UN
ITE
D K
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DO
M
DR
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No.
SC
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SU
RR
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K
T7
0R
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BRD
from
Exp
o T
ech
nolo
gie
s Li
mited,
neither
are
they
to b
e u
sed in a
ny
way
again
st o
ur
inte
rest
s.and a
re r
etu
rnable
upon r
equest
. T
hey
are
not
to b
e c
opie
d o
r co
mm
unic
ate
d in p
art
or
in w
hole
without
wri
tten c
onse
nt
The c
onte
nts
of
this
dra
win
g /
docu
ment
are
Copyr
ight
© E
xpo T
ech
nolo
gie
s Li
mited.
They
are
to b
e t
reate
d a
s co
nfidential
2 D
EC
PLA
CE ±
0.1
MIN
IPU
RG
E X
LC
SEQ
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XBR
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1:1
1
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RAW
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APP'D
CH
K'D
DR'W
N
JP
dB
PSC
NO
DEC
PLA
CE ±
0.5
1 D
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PLA
CE ±
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DRAW
N D
ATE:
EXPO
CETIF
ICATIO
N D
RAW
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EP99-2
-3
Optional opera
tion (
Use
r deci
sion)
Auto
matic
opera
tion b
y th
e s
yste
m
Key t
o funct
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Manual oper
ation b
y th
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r
TH
IS D
RAW
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IS R
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REN
CED
TO
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Indic
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Ala
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Pow
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turn
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matica
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"Pre
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signal abse
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i.e.
"Ala
rm"
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incl
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- Ala
rm a
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p
Red =
Pre
ssure
Low
Low
Pre
ssure
senso
r tu
rns
off
Encl
osu
re p
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ure
falls
belo
w t
he m
inim
um
Encl
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oor
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or
exce
ssiv
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Pre
ssuri
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ir o
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ert
gas
turn
ed o
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Purg
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rese
ts
Pow
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on -
Norm
al oper
ation
Leakage
Com
pen
sation s
tart
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Purg
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s; R
elie
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PRESSU
RIZ
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Sw
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gnal O
N
Purg
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imer
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No
Yes
Outlet
flo
w s
till
above
the
min
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?
Purg
e tim
er s
tart
s auto
matica
lly
Purg
ing I
ndic
ato
r tu
rns
Bla
ck a
s
depends
upon t
he u
ser.
Act
ions
Bla
ck =
Purg
e flo
w t
oo low
Purg
e F
low
Senso
r tu
rns
on
Yes
No
Purg
e O
utlet
flo
w a
bove
the
min
imum
?
Relie
f Valv
e o
pens
Purg
e flo
w s
tart
s"P
ress
uri
zed"
signal to
rem
ote
ala
rm s
witch
Am
ber
= P
urg
e flo
w O
K
Gre
en =
Pre
ssure
OK
Low
Pre
ssure
senso
r tu
rns
on
No
Yes
Is t
he
PE p
ress
ure
above
the
min
imum
?
Air
ente
rs t
he P
E
PRESSU
RIZ
ED
IN
DIC
ATO
R
Red =
Pre
ssure
Low
"Pre
ssuri
zed"
signal abse
nt
i.e.
"Ala
rm"
ON
Turn
Pre
ssuri
zing a
ir o
r in
ert
gas
on
Pre
ssuri
zed E
ncl
osu
re d
oor
close
dPRESSU
RIZ
ED
IN
DIC
ATO
R
REV
.M
OD
NUM
BER
APP
ROV
ED D
ATE
APP
ROV
ED
01D
RAW
N23
/06/
2010
JPd
B
flow
above t
he m
inim
um
speci
fied?
Air
ente
rs t
he P
E
PR
ESSU
RIZ
ED
IN
DIC
ATO
R
"Pre
ssuri
zed/F
low
" si
gnal abse
nt
i.e.
"Ala
rm"
ON
Turn
Pre
ssuri
zing a
ir o
r in
ert
gas
on
EXPO
CERTIF
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N D
RAW
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EP99-2
-4
"Pre
ssuri
zed/F
low
" si
gnal
to r
em
ote
ala
rm s
witch
Pre
ssuri
zed E
ncl
osu
re d
oor
close
d
TH
IS D
RAW
ING
IS R
EFE
REN
CED
TO
Purg
e f
low
cease
s; R
elie
f Valv
e c
lose
s
Act
ion t
aken o
n P
ress
ure
/Flo
w
Tri
p A
larm
and d
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rip
Poss
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n P
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Gre
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t "P
urg
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"Purg
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signal to
ele
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cal Pow
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Sw
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Optional opera
tion (
Use
r deci
sion)
failu
re d
epends
upon t
he
use
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Act
ions
incl
ude:-
Ala
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nd/o
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Failu
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(use
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sion)
Auto
matic
opera
tion b
y t
he s
yst
em
Key t
o f
unct
ions
Manual oper
ation b
y t
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use
r
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On I
ndic
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ithout
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y"P
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gnal abse
nt
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rm"
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Pre
ssuri
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inim
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Encl
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ssiv
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Pre
ssuri
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ir o
r in
ert
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Purg
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imer
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ts
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er
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Norm
al opera
tion
Outlet
flow
still
above t
he m
inim
um
?
Continuous
Flow
/ D
ilution F
low
sta
rts
No
Yes
Pow
er
on
Pow
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Sw
. si
gnal O
N
Purg
e t
imer
tim
es
out
Yes
Pow
er
turn
ed o
ff a
uto
matica
lly
Red =
Pre
ssure
/Flo
w L
ow
Low
Pre
ssure
/Flo
w s
enso
r tu
rns
off
Encl
osu
re p
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ure
or
Flow
Gre
en =
Pre
ssure
/Flo
w O
K
No
Purg
e O
utlet
flow
above t
he m
inim
um
?
Purg
e t
imer
start
s auto
matica
lly
Low
Pre
ssure
senso
r tu
rns
on
No
Yes
Encl
osu
re p
ress
ure
and t
he p
urg
e o
utlet
Red =
Pre
ssure
Low
PR
ESSU
RIZ
ED
IN
DIC
ATO
R
REV
.M
OD
NUM
BER
APP
ROV
ED D
ATE
APP
ROV
ED
01D
RAW
N23
/06/
2010
JPd
B
REV:
PSC
1
SU
RR
EY
K
T7
0R
H
JPdB
23/0
6/2
010
and a
re r
etu
rnable
upon r
equest
. T
hey
are
not
to b
e c
opie
d o
r co
mm
unic
ate
d in p
art
or
in w
hole
without
wri
tten c
onse
nt
TO
LER
AN
CES
MATER
IAL
3rd
AN
GLE
DO
NO
T S
CA
LE
Exp
o T
ech
no
log
ies L
imit
ed
JOB N
o:
FIN
ISH
TIT
LE
CU
STO
MER
:
FLA
TN
ES
S T
O B
E L
ES
S T
HA
N 0
.4m
m O
VER
AN
Y 1
00m
m L
EN
GTH
UN
SPEC
IFIE
D
PR
OJE
CTIO
ND
IMEN
SIO
NS
IN
mm
BR
D
DR'W
N
from
Exp
o T
ech
nolo
gie
s Li
mited,
neither
are
they
to b
e u
sed in a
ny
way
again
st o
ur
inte
rest
s.
Contr
olle
dU
NIT
ED
KIN
GD
OM
DR
AW
ING
No.
SCALE
The c
onte
nts
of th
is d
raw
ing /
docu
ment
are
Copyr
ight
© E
xpo T
ech
nolo
gie
s Li
mited.
They
are
to b
e t
reate
d a
s co
nfidential
2 D
EC
PLA
CE ±
0.1
SH
EET N
o.
O
F
XBR-7
TD
0-0
41
MIN
IPU
RG
E X
CF
SEQ
UEN
CE D
IAG
RAM
1:1
01
DR
AW
ING
STATU
S:
APP
'DCH
K'D
1
NO
DEC
PLA
CE ±
0.5
1 D
EC
PLA
CE ±
0.2
DR
AW
N D
ATE:
BS EN50016:1995 (2nd edition)[EEx p] II Sira Certificate Ex99E1002U
EEx p II SCS Certificate Ex 94C1052UEN50 016:1977 (BS 5501 pt 3)
PRESSURISE
PRESSURIZED(GREEN)
(VERT) (GELB)VORSPÜLUNGEN BALAYAGE
(GRÜN)DRUCK OK
(JAUNE)
(YELLOW)PURGING
ALARM(RED)
ALARM(ROT) (ROUGE)
ALARME
ORIFICE PLATEAND CIRCLIPSEE NOTE
GASKET
SPARK ARRESTORBODY
PURGE OUTLETDO NOT OBSTRUCT
HOUSING
GASKET
2
FOR LC SYSTEMS ONLY
FLATNESS TO
BE LESS THAN
0.4mm
OVER
ANY 100m
m LEN
GTH
UN
SP
EC
IFIED
TOLE
RA
NC
ES
MA
TER
IAL
DR
AW
ING
STA
TUS
:A
PP
RO
VE
D:
MO
D. N
o:D
ATE:
ISSUE:
3rd ANG
LEP
RO
JEC
TION
DIM
ENSIO
NS IN
mm
DO
NO
T SCALE
Expo Technologies Limited
JOB N
o:
FINISH
TITLE
CU
STO
ME
R:
SH
EE
T No.
OF
SUR
REY KT7 0R
HU
NITE
D K
ING
DO
M
DR
AW
ING
No.
SCALE
The contents of this drawing / docum
ent are Copyright
Expo Technologies Limited. They are to be treated as confidential and are returnable
upon request. They are not to be copied or comm
unicated in part or in whole w
ithout written consent from
Expo Technologies Limited, neither
are they to be used in any way against our interests.
NO
DEC
PLACE ±0.5
1 DEC
PLACE ±0.2
2 DEC
PLACE ±0.1
CERT RELATEDMJF
DRAWN
1
11
STAINLESS STEEL3
CF OPTION
SAU 25 SPARK ARRESTOR(CF OPTION ONLY)
D.P. LO 6mm OR M5 (10-32 UNF) FITTING SUPPLIED
MiniPurge CONFIGURATION
PIPING KIT (OPTIONAL)
DIRECT MOUNT (PREFERRED OPTION)
PANEL MOUNT
(OPTIONAL)
SIDE MOUNT
PRINT WINDOW ON VIEWPORT FULL SIZE
NOTE:- SYSTEMS SUPPLIED WITHOUT ENCLOSURES ARE SUPPLIED WITH A RANGE OF 8 ORIFICE PLATES TO SUIT FLOW RATES BETWEEN 10-225 NL/MIN (0.4-8 SCFM)
XBR-7TD0-003 ISSUE 4Sub MiniPurge Systems
CONFIGURATION
NOTES:
USE DIRECT MOUNTING WHEREVER POSSIBLE, WALL MOUNTING BRACKETS AND PIPING KITS FOR SIDE MOUNTING ARE OPTIONAL.
MINIPURGE MUST BE MOUNTED IN THE POSTIONS SHOWN.
PURGE AIR TO VENT INTO TOP OF ENCLOSURE AND EXIT THROUGH RELIEF VALVE /SPARK ARRESTOR AT THE BOTTOM OF THE ENCLOSURE.
1)
2)
3)
33 [1 516"] 29 [1 5
32"]
M5 FIXINGS SUPPLIEDØ6 (Ø1/4") HOLES REQUIRED IN ENCLOSURE.
46 [1
13 16"]
44 [12332"]
62 [21532"]
44 [1
23 32"]
HOLE Ø25(1") REQUIRED IN ENCLOSURE
55 [2
5 32"]
25 [31 32
"]
35 [1
3 8"]
LC OPTION ONLY.FLOW MONITORING PIPE REQUIRED
RLV 25 RELIEF VALVE
SAU25 SPARK ARRESTOR WEIGHT = 0.2 kg (0.44 lb)
RLV25 RELIEF VALVE WEIGHT = 0.5 kg (1.1 lb)
CUTOUT DETAILS VIEWED FROM INSIDE ENCLOSURE
M25 X 1.5P THREADØ26mm (1") CLEAREANCE HOLE REQUIRED IN ENCLOSURE
D.P. LO 6mm OR M5 (10-32 UNF) FITTING SUPPLIED
133
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ML358 v9 13-Nov-19
MiniPurge Interface Unit MIU/e User Instruction Manual
Manufacturer: Expo Technologies Ltd, Unit 2 The Summit, Sunbury on Thames. UK. Model Type & Rating: Certificates: Hazardous Area Marking Code:
APPLICATION SUITABILITY The MiniPurge Interface Units – MIU/e are certified for use in Hazardous Areas where the Hazardous Area is non-mining (i.e. above ground) and the hazard is caused by flammable gasses or vapours. The systems may be used in ATEX/IECEx Gas Zones 1 & 2, Gas Groups IIA, IIB & IIC and in Dust Zones 21 & 22, Dust Groups IIIA, IIIB & IIIC. The following materials are used in the construction of MIU/e: Stainless Steel, Steel, Brass, Copper, Polyamide, Silicone. If substances that will adversely affect any of these materials are present in the surrounding environment, please consult Expo Technologies for further guidance. This equipment is designed for use under normal industrial conditions of ambient temperature, humidity and vibration. Please consult Expo Technologies before installing this equipment in conditions that may cause stresses beyond normal industrial conditions.
WARNING - Only install, commission, inspect, maintain or fault find when safe to do so. INSTALLATION The MIU/e shall be installed in accordance with relevant standards, such as IEC 60079-14 and any local codes of practice that are in force. The MIU/e shall be connected to the Purge and Pressurization system in accordance with the instructions given in the handbook supplied with the pressurization system. The external earth connection of the MIU/e shall be connected to earth using minimum 4mm2 conductor. SELECTION OF CABLE, CABLE GLANDS AND CONDUCTORS IN CONDUIT Cable glands or other cable entry devices shall be appropriately certified and suitable for the cable and the conditions of use and be installed in accordance with the manufacturer’s instructions. When the MIU/e application requires the hazardous area marking code: Ex eb IIC T5 Gb, Tamb -20°C to +55°C there is no further guidance for the selection of cable and cable glands or conductors in conduit. When the MIU/e application requires the hazardous area marking code: Ex eb IIC T4 Gb, Tamb -20°C to +60°C the user shall select cable and cable glands or conductors in conduit that have a higher temperature rating than 83.2°C. TERMINALS MIU/e may be fitted with a combination of: WDU2.5 terminals certified to DEMKO 14 ATEX 1338U & IECEx ULD 14.0005U. SAK2.5 terminals certified to KEMA 97 ATEX 1798U & IECEx KEM06.0014U. WPE2.5 Earth terminals certified to DEMKO 14 ATEX 1338U & IECEx ULD 14.0005U. For all type of terminals: Tightening torque range: 0.4 to 0.8 Nm (WDU & WPE) & 0.4 to 0.6 Nm (SAK).
Conductor cross section maximum 2.5 mm2, minimum 1.5 mm2. Type of connection is screwed - Solid copper conductors to be used. Stripping length shall be 10 mm.
Only one conductor is allowed at each side of a terminal. Multiple conductors shall be crimped together before screwed into the terminal.
Maximum number of terminals: For Model MIU/e1 – Up to 18 current carrying terminals.
For Model MIU/e2 – Up to 33 current carrying terminals. For Model MIU/e1/MO – Up to 13 current carrying terminals.
COMMISSIONING The installation of the cable glands, electrical and earth connections shall be inspected for correct installation before the unit is put into service. The lid shall be correctly fitted. MAINTENANCE The condition of enclosure and associated cable glands shall be inspected for damage every six months. The terminals shall be inspected for tightness and gaskets inspected for damage. FAULT FINDING When wiring or signal fault occurs, check each terminated wire, terminals for tightness and gaskets for damage. External faults such as broken switches within the Control Unit may also require investigation.
MIU/e1 MIU/e2 MIU/e1/MO 400V / 7A 400V / 7A 400 V / 2A
IECEx EXV 19.0057X ExVeritas 19 ATEX 0542X TUV 12.1463 Ex eb IIC T5 Gb Ex tb IIIC T100°C Db Tamb -20°C to +55°C
II 2 G Ex eb IIC T5 Gb II 2 D Ex tb IIIC T100°C Db Tamb -20°C to +55°C
Ex e IIC T5 Gb Ex tb IIIC T100º Db IP66 Tamb -20°C to +55°C
Ex eb IIC T4 Gb Tamb -20ºC to +60ºC
II 2 G Ex eb IIC T4 Gb Tamb -20°C to +60°C
Ex e IIC T4 Gb Tamb -20ºC to +60ºC
SC004 Minipurge EU DoC Issue 13
EU-Declaration of Conformity
WithEuropeanDirectives
Issued under the sole responsibility of
Expo Technologies Ltd Unit 2, The Summit, Hanworth Road
Sunbury on Thames TW16 5DB, UK
This is to declare that the MiniPurge Purge Controller is manufactured in conformity with the following
European Directives and standards: Electromagnetic Compatibility Directive 2014/30/EU MiniPurge Systems with a /PO suffix in the type number are non-electrical and are outside the scope of the EMC Directive. MiniPurge Systems with suffices /PA or /IS incorporate one or more volt-free (“dry”) contacts which work in circuits specified by others. In normal operation these circuits are “benign” and no CE mark is appropriate. MiniPurge Systems with Electronic Timer (Option /ET and /ES) are designed to conform to the EMC Directive, in compliance with EN 61000-6-4:2007 and EN 61000-6-2:2005 (Intertek Report EM10048000) and 61000-6-4:2007 + A1:2011 and EN 61000-6-2:2005 (Intertek Report 102569070LHD-001) respectively. Low Voltage Directive 2014/35/EU MiniPurge Systems are intended for use in potentially explosive atmospheres (Hazardous Areas) and are therefore excluded from the Low Voltage Directive. Pressure Equipment Directive 2014/68/EU MiniPurge Systems are classified as not higher than category I under Article 13 of this Directive and intended for use in potentially explosive atmospheres (Hazardous Areas) and are therefore excluded from the Pressure Equipment Directive. MiniPurge Systems are covered under ATEX Directive 2014/34/EU. ATEX Directive 2014/34/EU Equipment for explosive atmospheres MiniPurge Systems are designed to conform to the ATEX Directive in fulfilment of the essential health and safety requirements set out in Annex II, and in compliance with: EN 60079-0: 2012 + A11:2013 EN 60079-2: 2014 MiniPurge Systems are certified by CSA Group Netherlands B.V., Utrechtseweg 310, 6812 AR, Arnhem, Netherlands, under EC Type-Examination Certificate SIRA 01ATEX1295X, in compliance with: EN 60079-0: 2012 + A11:2013 EN 60079-2: 2014 According to the model, MiniPurge Systems are rated and shall be marked as follows:
MiniPurge, Type X & Type Y models Group II Category 2G & 2D II 2(2) GD
Or MiniPurge, Type X Group II Category 2G II 2(2) G
MiniPurge, Type Z models Group II Category 3G & 3D II 2(3) GD MiniPurge systems are manufactured under Production Quality Assurance Notification SIRA 99 ATEX M043, issued by CSA Group Netherlands B.V. (CSA), Notified Body No 2813. Signed for and on behalf of Expo Technologies Ltd.,
John Paul de Beer Date 12/11/2019 Managing Director Confidential Assessment file reference SC004
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Expo Technologies USAExpo Technologies Inc.
9140 Ravenna Road Unit #3Twinsburg,
OH 440878, USAT: +1 440 247 5314F: +1 330 487 0611
Expo Technologies UKExpo Technologies Ltd.
Unit 2 The Summit, Hanworth RoadSunbury-On-Thames,
TW16 5DB, UKT: +44 20 8398 8011F: +44 20 8398 8014
Expo Technologies ChinaQingdao Expo M&E Technologies Co. Ltd
329 Huashan Er LuJimo City, Qingdao,
266200 ChinaT: +86 532 8906 9858F: +86 532 8906 9858
www.expoworldwide.com