Alarmline Linear Heat Detection Training presentation 2010.

Alarmline Linear Heat Detection

Training presentation 2010

2

What is Linear Heat Detection?

Data supplied by fire insurance companies indicates that most industrial fires are caused by

– Friction heat & sparks

– Overheating of equipment

– Spontaneous combustion

– Oil & oil fired equipment

• Temperature Related Risk Protection

3

What is Linear Heat Detection?

• Cable-type Sensor– “Point of Risk” Detection Method

• Detects Heat From Fire– Last stage of fire

• Typically used where smoke, flame or other detectors are not an option

4

Linear Heat detection products

- Alarmline Analogue: Averaging heat detector

- Alarmline digital: Fixed temperature detector.

5

Alarmline digital cable

• Two core cable

• Insulation designed to melt at a specific temperature

• When cable melts two inner cores short circuit.

• Monitoring equipment detects the short circuit and activates its alarm sequence

• The section of cable that has melted must be replaced to return the cable to its normal state

6

Alarmline Digital Cable range

H8040N

Black nylon outer sheath

Max Ambient temperature 45oC

Alarm temperature 63-70oC (Nominal 67oC)

Suitable for internal and external applications

7


• H8045N

– Red/black polythene braid with black nylon outer sheath

– Max Ambient temperature 45oC

– Alarm temperature 79-95oC (Nominal 87oC)

– Suitable for internal and external applications

8


• H8028

– Black PVC outer sheath



– Suitable for internal and external applications. Excluding areas contaminated by chemical agents.

9


H8069N

Red PVC outer sheath

Max Ambient temperature 105oC

Alarm temperature 177-189oC (Nominal 183oC)

Suitable for internal and external applications

Not suitable where exposed to long periods of direct sunlight

10


• H9650N

– White Fluoropolymer outer sheath



– Suitable for internal and external applications where high ambient temperatures or protection against chemical agents is required

11

Alarmline Digital Cable Construction

Conductor

Tinned copper covered steel

Insulation

Temperature sensitive thermoplastic or Fluoropolymer

Jacket

PVC, Nylon or Fluoropolymer

12

Monitoring Alarmline Digital cable

• Any monitored input capable of monitoring a switch operation

• Conventional detection zone– Sirius II conventional panel– FireBeta XT or XT+

• Addressable zone monitor interface or switch monitor interface

– Apollo ZMU or SMU– Hochiki CHQ-SZM, CHQ-DIM, CHQ-Z or CHQ-SIM

13

Connecting Alarmline digital cable to a monitored input

Monitored input

Detection zone or switch monitoring circuit

+

-

+

-

Interposing cable

+

-

Alarm resistor

+

-

End of Line monitoring resistor

Alarmline Digital sensor cable

14

Addressable vs. Conventional

ZONE A ZONE B ZONE C

MPMP

To

Co

nve

nti

on

al P

anel

MP

To

Ad

dit

ion

al Z

on

es

LHS

Hard-Wired System

15

Addressable vs. Conventional

ZONE A ZONE B ZONE C

Ad

dre

ssa

ble

loo

p

Loop interface

LHS

Addressable System

Ad

dre

ssa

ble

loo

p

Loop interface

Loop interface

MCPMCP MCP

16

Alarmline Analogue Cable

• Multi-conductor cable containing insulators whose resistance varies proportionately to changes in temperature

• Re-settable provided temperature does not exceed burn-off point of PVC coating

• Flexible alarm level adjusted via controller

• Allows testing without damaging cable

17

Alarmline Analogue Cable range

• Standard blue (K82017)– Non-corrosive atmospheres– Mechanical damage unlikely

• Nylon extruded (K82021)– Chemical protection

• Bronze braided (K82078)– Mechanical protection

• Stainless Steel braided over nylon extruded cable (K98166)

– Mechanical and Chemical protection

18

AlarmLine Analogue cable construction

• 4 conductor 0-46 mm dia copper cable– Two conductors for heat sensing– Two enameled conductors for continuity– Twisted at 30 turns per foot to cancel potentially high

voltage inductance

Continuity monitoring

Resistance (Temperature sensing)

Continuity monitoring

IMPORTANT! Always ensure the varnish coating is removed from the Orange and Red wires before termination.

19

Monitoring Alarmline Analogue cable

• Requires purpose built interface

– LHD4 Controller- 2 wire connection- Fire and Fault relay (energised)- Fire and Fault relay (de-energised)

– LWM-1 Controller

20

Alarmline LHD 4 Controller

• Polycarbonate enclosure IP55

• LED status indications

• Test switch

• Alarm level adjusted via moveable link

• Open circuit and closed circuit fault monitoring

• Allows quick system adjustments without cable or hardware change

• Maximum 1000m detection cable

• Can only be reset by removing the power

21

Alarmline LHD4 internal connections

Relay outputs

Rated 2 Amp @ 30vdc

Fire relay – Common, N/O, N/C terminals

Fault relay - Common. N/O, N/Cterminals

Energised or de-energised options

Supply terminals

Supply voltage 8 to 30vdc

Current rating:

Without relays QI – 180µA AI – 70mA

With relays QI – 20mA AI – 85mA

Sensor cable terminals

3 - Orange wire

4 - White wire

5 - Red wire

6 - Blue wire

Important! Always remove varnish coating from Orange and Red wires before terminating

Remote Fire LED output

24vdc output

Fault contact terminals

Used to provide fault monitoring when powered from a conventional detection circuit

Power supply output

24v output to power additional controllers

22

Interfacing LHD4 to a two wire detection zone

• LHD controllers are powered direct from the zone

• Maximum three control units powered from a single zone

23

Alarmline Analogue - Conventional system

Standard 4 core cable

Hazard2 WireInterfaceModule

AlarmLine Sensor

KiddeControlPanel

Standard 2 core cable

Max (1,000 m)

JunctionBox

24

Alarmline Analogue – Addressable fire system

Max 127 Loopdevices

Addressable Loop~1000 Meters

AlarmLine Analogue Sensor

MCP MCPSmoke

Det

LHD LHD LHD

LoopI/F

LoopI/F

LoopI/F

24v PSU 240vac

HeatDet

25

Alarmline Analogue - Nomogram

• Calculates alarm link setting based on

– Max ambient tempor– Specific Alarm temp

• Calculates ‘HOT SPOT’ temp

• Calculates maximum possible alarm temperature for a fixed cable length

26

How to set the Alarm thresholds

Use the Nomogram provided in the Alarmline Analogue manual

Step 2 - Select the Max AmbientTemperature where an

alarm must not be given (B) 45oC

Step 3 - Draw a line through the two points continuing through the switch setting line (A)

Step 1 - Select the length ofcable i.e.100m (D)

Step 4 - Set the controller to linkposition 6

The above provides us with a configuration of:Max Ambient temperature 45oCAlarm temperature 57oC

27

A ‘HOT SPOT’ is where only a small section of the cable length is subjected to heat.

This section will have to reach a higher temperature before an alarm is activated

Example

- 10 meter length = Alarm temp 84oC

- 1 meter length = Alarm temp 120oC

How to calculate a ‘HOT SPOT’ temperature

To calculate the hot spot draw a line from the switch setting across to the hot spot length

28

Using the Nomogram as a design tool

The Nomogram can provide assistance in determining zone sizes for larger areas

If we draw a line from the cable length column across to our maximum link setting we can determine the maximum possible ambient temperature for that cable length

If the calculated max ambient temp is below the actual ambient temp then it may be necessary to reduce the system into smaller cable lengths

Example:

Cable length 1000m gives a maximum possible ambient for the cable of 41oC and maximum alarm temp 48oC

Cable length 500m gives a maximum possible ambient for the cable of 48oC and maximum alarm temp 62oC

29

Alarmline LWM-1 Controller

• Approved to EN54 Part 5 when used with K82017, K82021 and K98166

• Maximum cable length 300m

• Can be configured for fixed temperature (Max Alarm) or rate of rise (Diff Alarm)

• LED status indications

• Internal pushbutton controls– Test (Fault)– Test (Alarm)– Reset

• Relay outputs– Diff Alarm– Max Alarm

• Remote reset facility

• Requires 24vdc supply, Max current 25mA

• ABS enclosure, IP65

30

LWM-1 Controller - Internal controls

TEST – FireMomentary pushbutton simulates an alarm condition when pressed for a minimum of 2 secs

RESETMomentary pushbutton performs a fault condition soft reset when pressed for a minimum of 2 secs

TEST – FaultMomentary pushbutton simulates a short circuit cable fault when pressed for a minimum of 2 secs

Configuration switches4 DIL switches used for configuring the controller to the application

31

Alarmline LWM-1 Configuration switchesAlarmline LWM-1 Configuration switches

Diff and Max alarm combined

In the ‘ON’ position if either the Max- or Diff-Alarm is triggered both alarm relays will be activated. The corresponding alarm-

LEDs will be activated on their individual alarms.

Default position is ‘ON’

Isolate

In the ‘ON’ position this prevents the alarm relays from activating in an alarm condition.

The Fault relay will operate and the Fault LED will illuminate constantly

DIFF TIME

The ‘DIFF TIME’ is the time window for rate of rise detection.

The shorter the time interval the less sensitive the system response is.

DIFF ALARM

The DIFF ALARM switch changes the temperature range for a rate of rise alarm.

The higher the value chosen the higher the possible temperature

MAX ALARM

The MAX ALARM switch sets the fixed alarm temperature value.

This value is set using the Nomogram.

32

DIFF TIME and DIFF Alarm settingsDIFF TIME and DIFF Alarm settings

LWM-1-System can be configured to operate as a heat detector of the classes A1, A2, B and C. The adjustments are given depending on sensitivity class and the length of the installed sensor cable.

Classification DIFF TIME switch setting

DIFF ALARM switch setting

Comments

A1 5 5 Standard blue cable only

A1 5 4 Nylon coated cable only

A2 5 8

B 5 9

C 6 13

33

Application specific – Sensitivity settings

Application DIFF TIMESwitch setting

DIFF ALARMSwitch setting

Sensitivity class

Underground Installation (no road tunnels)

555

548

A1 (Blue cable only)A1 (Nylon cable only)

A2Installation on concrete ceilings and other non-heat conducting materials above ground, not exposed to direct solar radiation

55556

5489

13


A2BC

Installation on insulated metal ceiling or metal container not exposed to direct solar radiation

55556

5489

13


A2BC

Installation on un-insulated metal ceiling or if exposed to direct solar radiation

56

913

BC

Road tunnel 55556

5489

13


A2BC

34

Configuring MAX ALARM settingConfiguring MAX ALARM setting

The MAX ALARM setting is calculated using the Nomogram.

A 100m length of cable to give a fixed alarm temperature of 55oC would be set switch setting 8.

A 1 metre HOT SPOT on switch setting 8 would alarm at 115oC

MAX ALARM switch setting

Max ambient temp oC

Specified alarm temp oC

Cable length (m)

Alarmline Linear Heat Detection

Installation and commissioning

36

Installation recommendations Alarmline cable

Installation of the cable will depend greatly upon the application

• Cable should be supported every metre

• 1 Clip either side of a bend

• Minimum bend radius– Digital cable 50mm (Cold store 100mm)– Analogue cable 10mm (Cold store store 100mm)

• Interposing cable– Analogue

- LHD4 – 2Km Max- LWM-1 – 500m Max

• When using metal clips cable must be insulated from the clip using a neoprene sleeve

37

Standard fixing clip types

Channel bracket

Edge clip

‘L’ bracket

Pipe bracket

‘T’ Clip

‘V’ Clip

Distance piece

38

Jointing and terminating Analogue cable

K82024 In-line Jointing kit

K82023 End of line termination kit

39

Installation in intrinsically safe areas

• Suitable for use in Class 1, Div 1, Groups A, B, C, D classified areas

• Detection cable must be wired through IS barriers before connecting to the control unit

• Approved IS barriers– Analogue cable MTL7761ac, 2 x barriers per cable– Digital cable MTL5061, 1 x barrier per cable

• Ex approved junction boxes must be used when terminating and joining cables.

40

Commissioning Alarmline Digital system

• Visual examination

• Add an extra piece of sensor cable to the end of the installed sensor cable to assist with testing

• Apply sufficient heat to trigger an alarm condition

• Heat oven or heat gun can be used

• Simulate an open circuit fault by disconnecting one core of the sensor cable

• In hazardous areas alarm can be simulated by placing a short circuit across the sensor cable

• Record the results

41

Commissioning of Alarmline Analogue cable

• Visual examination of sensor cable

• Check wiring connections

• Check alarm settings using Nomogram

• Simulate alarm and fault using test switch

• Simulate open and circuit fault on sensor cable

• Apply heat to a 1 metre section of the cable using the heat oven and ensure the system alarms at the correct temperature (check Nomogram)

• Record the results

42

Fault finding digital cable

• Control panel indicates sensor cable fault– Check wiring connections– Ensure correct value end of line monitoring resistor is fitted

• Control panel indicates sensor cable fire– Ensure fire condition does not exist– Check the cable for damage i.e. short circuit– Check alarm resistor is located correctly in the circuit– Check end of line resistor is correct value

• Cable activated but panel displays fault not fire– Check alarm resistor is in circuit– Check cable isn’t damaged i.e. open circuit

• Cable open circuit but no fault on panel– Check end of line is correctly located at end of sensor cable

43

Fault finding Alarmline Analogue system – LHD4

• LHD4 unit indicates fault– Check the sensor cable connections– Check the sensor cable for damage– Check that varnish has been removed from the orange and red cores at both

ends of the sensor cable– Check alarm link setting

• Heat applied to sensor cable but alarm not activated– Check alarm link setting– Check cable for damage– Ensure sufficient heat applied

• LHD4 showing no faults but fault indicated at main fire panel– Check whether fault relay is energised or de-energised version and check fault

relay wiring

• LHD4 showing no fire but fire indicated at main fire panel– Check wiring of fire relay

44

Fault finding Alarmline Analogue system – LWM-1

• LWM-1 indicates fault– Check the sensor cable connections– Check the sensor cable for damage– Check that varnish has been removed from the orange and red cores at both

ends of the sensor cable– Check Max Alarm switch– Check Isolate switch– Check external reset wiring and monitoring resistor

• Heat applied to sensor cable but alarm not activated– Check alarm switch settings– Check cable for damage– Ensure sufficient heat applied

• LHD4 showing no faults but fault indicated at main fire panel– Check fault relay wiring

• LHD4 showing no fire but fire indicated at main fire panel– Check fire relay wiring

Alarmline Linear Heat detection

Design and application guidelines

46

Advantages of Alarmline Linear Heat Detection

• Unaffected by environmental conditions

• Installation at point of risk

• No maintenance required

• Suitable for hazardous areas

47

Protection of cable trays and risers

• Cable installed close to risk to detect a cable overheat

• A single cable can cover a cable tray 600m wide

• Cable positioned max 200mm above cable tray

• Sensor cable run underneath lowest cable tray to detect rubbish fires

• ‘V’ clips, L brackets distance pieces may be required

48

Escalator protection

• Main risk is overheat due to friction, or build up of rubbish under escalator

• Protects drive motor, roller bearings, dust collection trays and truss rollers

• Recommended analogue cable with bronze or stainless steel braiding

• Edge clips are generally most suitable

49

• Main risks overheat on bearings due to friction

• Cable installed close to point of risk

• If possible consider cable above and below the conveyor

• To provide best coverage cable should be run down both sides of conveyor

• Recommended bronze or stainless steel braided analogue cable

• Edge clips likely most suitable

Conveyor belts

50

ToControlPanel

JunctionBox

JunctionBox

Detection Cable(of specified temperature)

10

2.5 2.5

5

Road tunnels

• Main risk vehicle fire

• Consider splitting tunnel into smaller detection zones

• Sensor cables run down both sides of tunnel, consider sensor cable down centre of tunnel

• ‘T’ Clips likely most suitable

• Consider Nylon coated sensor cable for environmental protection

51

Control InterfaceUnit(Analogue)Junction Box(Digital)

9mtypical

Car parks

• Risk vehicle fire

• Consider size of detection zones

• Consider spacing of cable runs

• Cable fixed to ceiling

• ‘T’ Clips likely most suitable

52

Storage areas – general area protection

• Sensor cable at high level

• Consider sensor cable sensitivity

• Fixing clips possibly ‘T’ or edge clips

• Same design limitations as point type heat detectors

• Maximum spacing between cable runs 10.3m

• Maximum installation height 9m

53

Storage area in-rack protection

• Improves the response time of the system

• Where highly flammable or high value equipment is stored

• Ensure cable positioned where it won’t be damaged

• Edge clips possibly most suitable

• Consider running cable at various levels

54

Floating Roof Storage Tanks

• Main risk overheat due to friction, fuel fire

• Consider possible hazardous environment

• Sensor cable installed around rim seal

• Fixing arrangement will depend upon rim seal design

• Requires cable reeler

• Ex junction boxes

• Consider detection around bund areas also

• Nylon coated sensor cable

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JU N C TIO N BO X W ITHC ABLE C O LLEC TIN G A S SE M BLYR ETR A C TAB LE C AB LE

JU N C TIO N BO X

R IM SEA L

C O N TR O L C U BIC LELO C ATED IN SA FEA R EA

ZEN N E R B AR R IERC O M PARTM EN T

4 C O R E IN TER P O SIN G C A BLES U PP LIED A N D IN S TA LLE D B Y O TH E R S

S U PP O RT BR AC KE TS

A LA R M LIN E LIN EAR H EATS EN S O R C ABLEA R O U N D R IM S EA L

TA N K

Floating roof tank schematic

56

Other applications

• Boilers

• Control cubicles

• Engine bay protection

• Silos and driers

• Thatched roofs

• Paint spray booths

• Rolling stock

• Transformers

And many more

Alarmline Linear Heat Detection Training presentation 2010.

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Transcript of Alarmline Linear Heat Detection Training presentation 2010.