Sensors for pressure, temperature and rpm for p,t,rpm english.pdf · type DS 03 Rev. speed...
Transcript of Sensors for pressure, temperature and rpm for p,t,rpm english.pdf · type DS 03 Rev. speed...
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Sensors for pressure,temperature and rpm
English
Limburg
Test with confidence
Messen mit System
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Pressure switches Pressure measurement Page 7
Mechanical pressure switch (piston technique with switch)for low-voltage (e.g. in vehicles).
Electrical pressure switches with output stage (NPN) as an openeror a closer or both of them in one sensor.
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Survey
Pressure sensors PR 15 Pressure measurement Page 4
Mounting and dismounting of sensor without system shut downwhen used in conjunction with MINIMESS pressure test points.
Measurement of pressure burden, negative pressure and pressure peaks.
Output signals according to the industrial standard 0 to 2 mA /4 to 20 mA
Linearisation of the characteristic curve up to ± 0,1 % of full scalepossible with HYDROTECHNIK measuring instruments
Measuring range from -1 to 1000 bar
Dual sensors forpressure and temperature
Pressure and temperature measurement Page 6
The dual sensor for simultaneous measurement of pressureand temperature.
Only one connection through p/T-test point.
Mounting and dismounting of sensor without system shut down.
Output signal according to the industrial standard 4 to 20 mA.
Measurement of pressure and pressure peaks, pressure measuring ranges60 bar and 600 bar, temperature measuring range - 50 °C to + 200 °C.
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Pressure sensors HD Pressure measurement Page 5
Mounting and dismounting of sensor without system shut downwhen used in conjunction with MINIMESS pressure test points.
Measurement of pressure and pressure peaks.
Output signals according to the industrial standard 0 to 20 mA / 4 to 20 mAor 0 to 10 V alternatively.
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Adaptationsand connections
Accessories Page 12
Direct mechanical adaptation between pressure sensor and MINIMESStest point (mechanical screw coupling) with the advantage of mountingand dismounting without system shut down.Electrical plug-in connections to connect the measuring wires to the sensors.
Survey
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Temperaturescrew-in sensors
Temperature measurement Page 9
Mounting and dismounting of sensors without system shut downwhen used in conjunction with p/T-test point.
Direct contact between measuring element and medium ensurestruly representative measurements.
Flooded temperature probe ensures excellent heat transmissionwhen it is screwed in.
Output signals according to the industrial standard 0 to 20 mA / 4 to 20 mA
Temperature measuring range: -50 °C to +200 °C
Rev. speed sensortype DS 03
Rev. speed measurement Page 11
Measurement of the RPM up to a distance of 4000 mm.Measuring principle: infrared with polarised light, all catoptric elements,borings, keyways and soiling are suppressed by sticking-on a specialreflective foil.
Inductive, compact rev. speed sensor with integrated amplifierfor measurements on gear wheels, especially with slow machines.Ideally suited for measurement of volume flow rate with turbineswhen using very long cables, to ensure a signal transmission freefrom interference.
Inductive pulse amplifier
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Surface sensor Temperature measurement Page 10
Temperature surface sensors for the fast measurement of surfacetemperatures in systems, on pipes, etc.Output signals according to the industrial standard 4 to 20 mATemperature measuring range: -50 °C to +200 °C
Temperature immersion sensors for the fast measurement of mediatemperatures in open receptacles, e.g. tanks, exhaust pipes, etc.Output signals according to the industrial standard 4 to 20 mATemperature measuring range: -50 °C to +200 °CTemperature measuring range: -50 °C to +400 °C
Immersion sensor
We reserve the right to make technical modifications
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Technical data PR 15
Pressure measuring ranges PR 15 / 4 to 20 mA Part-number
- 1 to +6 3403-32-71.370 to 60 3403-21-71.370 to 200 3403-10-71.370 to 400 3403-15-71.370 to 600 3403-18-71.370 to 1000 3403-29-71.37
Connection scheme 4 to 20 mA2-wire technique
12
345
p
I
-Ub (-signal)
+Ub (+signal)
Further output signals on request.
Reference of the specified data 20 °C ±3 K
Pressure measuring ranges PR 15 / 0 to 20 mA Part-number
- 1 to +6 3403-32-71.330 to 60 3403-21-71.330 to 200 3403-10-71.330 to 400 3403-15-71.330 to 600 3403-18-71.330 to 1000 3403-29-71.33
Connection scheme 0 to 20 mA3-wire technique
12
345
p
I
signal + -U
b/signal GND
+Ub
Connection X
Measuring principle: piezo-resistiveMeasuring signal output: 0 to 20 mA or 4 to 20 mA alternativelySupply voltage: 6,5 to 30 VDCCurrent consumption: approx. 4 mA (without pressure on sensor)Non-linearity and hysteresis: < ± 0,5 % of full scaleRepeatability: < ± 0,15 % of full scaleMechanical overload capacity: 1,5 x nominal pressureWorking temperature: -40 °C to +120 °CCompensated temperature range: -10 °C to +80 °CTemperature coefficient- on zero: < 0,03 %/K- on span: < 0,03 %/KResonance frequency: > 30 kHz (diaphragm)Pressure cycle: > 10 x 106
Frequency response (amplifier): from DC to 500 Hz (RL = 100 Ohm, CL = 100 pF)Measuring range <10 bar relative pressureMeasuring range >10 bar calibration zero at ambient pressure of approx. 1 barMeasuring connection (electr.): 5-poles, fitting plug (cable socket) see page 13Pressure connection G (mech.): ISO 228-G1/4-internal threadMaterial: diaphragm: 1.4435; housing:1.4104, 1.4301
Dimensions:
}(Over compensated temperature range)
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Technical data HDReference of the specified data 20 °C ±3 K
Pressure measuring ranges HD / 0 to 10 VDC Part-number
0 to 60 3403-21-A4.390 to 200 3403-10-A4.390 to 400 3403-15-A4.390 to 600 3403-18-A4.39
Connection scheme 0 to 10 VDC3-wire technique
12
345
p
U
signal + -Ub/ signal GND+Ub
Option
Pressure measuring ranges HD / 4 to 20 mA Part-number
0 to 60 3403-21-A4.370 to 200 3403-10-A4.370 to 400 3403-15-A4.370 to 600 3403-18-A4.37
Connection scheme 4 to 20 mA2-wire technique
12
345
p
I
-Ub ( -signal)
+Ub (+signal)
Pressure measuring ranges HD / 0 to 20 mA Part-number
0 to 60 3403-21-A4.330 to 200 3403-10-A4.330 to 400 3403-15-A4.330 to 600 3403-18-A4.33
Connection scheme 0 to 20 mA3-wire technique
signal + -U
b/ signal GND
+Ub
Measuring principle: thin film-DMS / relative pressureMeasuring signal output: 0 to 20 mA (3-wire), 4 to 20 mA (2-wire) or 0 to 10 VDC
(3-wire) alternativelySupply voltage: 9 to 30 VDC (when the output signal is 0 to 20 mA /4 to 20 mA)
option: 13 to 30 VDC (when the output signal is 0 to 10 VDC)Current consumption: 4 mA (0 to 20 mA), 3,6 mA (4 to 20 mA)
max. 8 mA (option: 0 to 10 VDC) without pressure on sensorNon-linearity and hysteresis: < ± 0,5 % of full scaleRepeatability: < ± 0,15 % of full scaleMechanical overload capacity: 2 x nominal pressureBursting pressure: 4 x nominal pressureTemperature of media: -40 °C to +100 °CCompensated temperature range: -20 °C to +80 °CTemperature coefficient- on zero: < 0,03 %/K- on span: < 0,02 %/KResonance frequency: > 10 kHz (diaphragm)Pressure cycle: > 10 x 10 6
Frequency response (amplifier): from DC to 500 Hz (RL = 100 Ohm, CL = 100 pF)Measuring connection (electr.): 5-poles, fitting plug (cable socket) see page 13Pressure connection G (mech.): ISO 228-G1/4-external thread, sealing: FPM (Viton)Material: media contacting parts: 1.4571 and 1.4542; housing: 1.4301
Dimensions:
}(Over compensated temperature range)
Connection X
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345
p
I
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Technical data dual sensor p/TReference of the specified data 20 °C ±3 K
12
345
p
I
I
678
+Ub (+signal)
-Ub
( -signal)
+Ub (+signal) -Ub ( -signal)
Connection scheme 4 to 20 mA2-wire technique
(pressure)
(temperature)
Pressure measuring ranges PR 15 / 4 to 20 mA Part-number
0 to 60for test points series 1620
3163-04-34.000 to 600 3163-03-34.00
Common technical data
Measuring signal output: 2 separate outputs 4 to 20 mA (2-wire technique) for pressureand temperature
Supply voltage: 10 to 30 VDCLoad resistance RL : 0 to 1 kOhmWorking temperature electronic: -20 °C to +80 °CElectr. measuring connection: 8-poles, fitting plug (cable socket) see page 13Mech. measuring connection: provided for p/T-test point series 1620 (M 16x2), see page 13Material: 1.4435, 1.4571; sealing: NBR
Techn. data of the pressure sensor part
Measuring principle: piezo-resistive / relative pressureCurrent consumption: approx. 4 mA (without pressure on sensor)Non-linearity and hysteresis: < ± 0,5 % of full scale, typical ± 0,2 %Repeatability: < ± 0,15 % of full scale, typical ± 0,1 %Compensated temperature range: -10 °C to +80 °CTemperature coefficient- on zero: < 0,01 %/K- on span: < 0,01 %/KMechanical overload capacity: 1,5 x nominal pressureResonance frequency: > 30 kHz (diaphragm)Pressure cycle: > 10 x 106
Techn. data of the temperature sensor part
Measuring range: -50 °C to +200 °C (corresponds to signal 4 to 20 mA)Error limit: < ± 1% of full scaleTemperature coefficient: < ± 0,3% / 10 KTechnology (sensor element): platinum measuring resistor Pt 100, according to DIN 43760, class B,
mounted in high pressure metal tube
Dimensions: Connection X
} (Over compensated temperature range)
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Technical data pressure switchReference of the specified data 20 °C ±3 K
Function: Opener Part-number
Opens when pressure rises ≤ 160 ±10 bar 5818-01-08.00Closes when pressure falls ≥ 130 bar
Further pressure measuring ranges on request
Function: Opener Part-number
Opens when pressure rises ≤ 130 - 8 bar 5818-01-10.00Closes when pressure falls ≥ 105±5 bar
electrical connectionthrough plug-in contact
Measuring principle: piston with prestressable springType of switch: micro switch (pole changing switch)
switches to housing mass (minus)Switching voltage: direct voltage 12 to 24 VSwitching capacity: 20 WattProtective system: IP 58 according to DIN 40050
(impermeable to presswater against 1 mWs in connection with rubber cap)External electr. connection: 1-pole flat plug 6,3 mm according to DIN 46247Work's adjustment of pressure: switch opens when pressure rises, see table
switch closes when pressure falls, see tableMech. pressure connection G: external thread M 12 x 1,5Starting torque: 30 Nm max.Working temperature: -30 °C to +85 °CMedia application: for hydraulic- and other mineral oilsFitting position: all positions possibleWeight: approx. 150 g
Dimensions: Connection X
p
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Technical data pressure switchReference of the specified data 20 °C ±3 K
Further pressure limit values on request.
Connections
Separate opener and closer
Pin 1 = voltage supply +Pin 2 = GND (-)Pin 3 = output switch opener (open collector)Pin 4 = output switch closer (open collector)
fig. 3
Closer
Socket 1 = voltage supply +Pin 2 = GND (-)Pin 3 = output switch (open collector)
fig. 2
Opener
Pin 1 = voltage supply +Socket 2 = GND (-)Socket 3 = output switch (open collector)
fig. 1
Connections
Function: Opener Function: Closer Part-number
Opens when pressure Closes when pressurerises 5 ± 0,5 bar rises 5 ± 0,5 bar 5118-01-10.00Closes when pressure Opens when pressurefalls 4 ± 0,5 bar falls 4 ± 0,5 bar
Function: Closer Part-number
Closes when pressure rises 5 ± 0,5 bar 5118-01-12.00Opens when pressure falls 4 ± 0,5 bar
Function: Opener Part-number
Opens when pressure rises 5 ± 0,5 bar 5118-01-11.00Closes when pressure falls 4 ± 0,5 bar
Measuring principle: piezo-resistive pressure sensor elementOutput: electrical switch (NPN) either as opener or closer or both types
opener/closer as separated outputs (see table)max. 28 VDC/approx. 100 mA, short circuit-proof, impedance 42 Ohm
Supply voltage: 10 to 30 VDC, reverse protection, spike load 100 V/2 msMeasuring range: 4 to 5 ± 0,5 bar (see table)Hysteresis: < 1 barMechanical overload capacity: 50 barWorking temperature: -40 °C to +125 °CPressure cycle: > 1 x 107
Protective system: IP 67 according to DIN 40050Measuring connection (electr.): 3-poles or 4-poles (see diagramm: scheme)Pressure connection G (mech.): ISO 228-G1/4-external thread, sealing: VitonDynamic strength: 15 g, 5 to 2000 Hz, max. 5 mm vibr. liftingResistance to thermal shocks: 50 g, half-sine 6 msMaterial: housing: 1.4305; pressure connection: 1.4435
Dimensions:
}acc. to DIN IEC 68
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Technical data temperature sensorReference of the specified data 20 °C ±3 K
Connection scheme 4 to 20 mA2-wire technique
-Ub ( -signal)
+Ub (+signal)
Screw-in sensor / 4 to 20 mA L (mm) L1 (mm) Part-number
132,5 34,5 3969-04-01.0012345
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Screw-in sensor / 0 to 20 mA L (mm) L1 (mm) Part-number
132,5 34,5 3973-04-01.00
Connection scheme 0 to 20 mA3-wire technique
signal + -Ub / signal GND+Ub
12345
I
Measuring principle: resistance measurement depending on temperature (resistive-Tc)Technology (sensor element): platinum measuring resistor Pt 100, according to DIN 43760, class B
mounted in high pressure metal tubeSupply voltage: 10 to 30 VDCMeasuring range: -50 °C to +200 °CSignal output: 0 to 20 mA (3-wire) or 4 to 20 mA (2-wire) alternativelyError limit: < ±1% of full scaleTemperature coefficient: < ±0,3% / 10 KWorking temperature, electronic: -20 °C to +80 °CPossible pressure load of sensor: max. 630 barMeasuring connection (electr.): 5-poles, fitting plug (cable socket) see page 13Temperature connection (mech.): provided for p/T-test point series 1620 (M 16 x 2), see page 13Material: housing: 1.4104, electronic in casting compound
Dimensions: Connection X
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Technical data temperature sensorReference of the specified data 20 °C ±3 K
Immersion sensor / 4 to 20 mA Part-number
Measuring range -50 °C to +200 °C 3170-02-06.00Measuring range -50 °C to +400 °C 3170-02-08.00
Surface sensor / 4 to 20 mA Part-number
Measuring range -50 °C to +200 °C 3170-01-03.00
Connection scheme 4 to 20 mA2-wire technique
12345
I
-Ub ( -signal)
+Ub (+signal)
Surface sensor
Immersion sensor
Connection X
Connection X
Measuring principle: resistance measurement depending on temperature (resistive-Tc)Technology (sensor element): platinum measuring resistor Pt 100, according to DIN 43760, class B,
in metal tube made from stainless steel 1.4571, grip: black plastic
Supply voltage, electronic: 14 to 30 VDCMeasuring range: see tableSignal output: 4 to 20 mA (2-wire)
Error limit < ± 0,5 % of full scaleTemperature coefficient: < ± 0,4 % / 10 KAmbient temperature: max. +70 °C
Measuring connection (electr.): 5-poles cable plug (Amphenol-Tuchel)
Media application: surface sensor: metallic surfaces as well as measuring placeswhich are hard to reach
immersion sensor: liquids, powder and granulates
Dimensions:
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Technical data RPM sensorReference of the specified data 20 °C ±3 K
12345
Signal + -Ub / GND+Ub
signal + -Ub/mass+Ub
12345
Technical data RPM sensorReference of the specified data 20 °C ±3 K
Measuring principle: inductive with integrated amplifierVoltage supply: 6,5 to 24 VDCOutput signal: max. 2 V below voltage supplyCurrent consumption: 12 mAAmbient temperature: -20 °C to +80 °CMaterial: housing: aluminium, anodic oxidisedMeasuring connection (electr.): 5-poles, fitting plug (cable socket) see page 13
Dimensions:
RPM sensor type DS 03 Part-number
DC up to max. 500 Hz 3130-02-01.00
Inductive transducer Part-number
3107-00-09.00
Measuring principle: reflecting light-barrier with visible, pulsating red light (LED)Scanning: receiver with polarising filterReflector: reflective foil, dimensions 10 x 25 mmCoverage: min. distance 50 mm, max. distance 4000 mmSensitivity: adjustable with a potentiometer to stop down the backgroundAverage life time of the light source: 100 000 hoursVoltage supply: 7,5 to 30 VDC, reverse protectionOutput signal: approx. voltage supply, short circuit proofSignal repetition rate: max. 500 HzReaction time: 1 msCurrent consumption: < 30 mAWorking temperature: -10 °C to +60 °CStoring temperature: -40 °C to +75 °CProtective system: IP 67 (IP 40 for connector)Max. switching current: 200 mAConnection cable: 5-poles, fitting plug (cable socket) see page 13
Dimensions: Connection X
Connection X
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Accessories
Direct connection for pressure sensors type HD
SW19
G1
SW22
G2
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Sensor-connection G2 Thread G1 Part-number
ISO 228-G 1/4 MINIMESS 1620 2103-07-08.62internal thread M 16 x 2straight
Sensor-connection G2 Thread G1 Part-number
ISO 228-G 1/4 MINIMESS 1620 2146-13-05.00internal thread M 16 x 290°
ø25
SW 19
G1
27,5
G2
28
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Direct connection for pressure sensors type PR 15
Sensor-connection G2 Thread G1 Part-number
ISO 228-G 1/4 MINIMESS 1620 2146-05-30.00external thread M 16 x 2straight
Sensor-connection G2 Thread G1 Part-number
ISO 228-G 1/4 MINIMESS 1620 2146-54-19.40external thread M 16 x 290°
G2
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SW19 21
ø20
G1
SW 19 16
ø 25
27,5
G1
G2
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Accessories
Cable Part-number
4-poles, shielded PVC-cable, colour grey 8824-02-02.017-poles, shielded PVC-cable, colour grey 8824-02-03.01
Cable
Cable plug (male) Part-number
5-poles connection (pin) 8808-04-00.01
Cable plug (female) Part-number
5-poles connection (socket) 8808-05-00.018-poles connection (socket) 8808-05-00.04
Connections
p/T-test point for pressure and temperature (series 1620)
ø 20
G
Hi
SW
L 0 L
27*)
12
G1/4ø20
45°
1,5 Remark:
L0 = max. immersion depthL = uncoupled*) recommended min.depth of drill
Ident.-no. and number of identifi-cation grooves must be identicalon the p/T-test point and the dualsensor or temperature screw-insensor, respectively.
Form F
Thread G Sealing pmax H i L0 L SW Part-number
ISO 228-G 1/4 Gi-ring / form F 630 bar 36,5 10 16 14,5 19 2149-04-15.13sealing: Buna N
Thread G Sealing pmax H i L0 L SW Part-number
M 10 x 1 O-ring / form G 630 bar 38 8,5 16 14,5 17 2149-04-19.13sealing: Buna N
ø 20
Hi
L 0
G
SW
L
Remark:L0 = max. immersion depthL = uncoupled*) recommended min.depth of drill25
,5*)
9
2,5+
0,2
0,5+
0,15
ø11,5
M10x1
30°
Form G
Ident.-no. and number of identifi-cation grooves must be identicalon the p/T-test point and the dualsensor or temperature screw-insensor, respectively.
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Nomenklatur über fachtechnische Begriffe in der Sensortechnik
Fehlergrenze: Sind die in den technischen Daten dokumentierten zugelassenenAbweichungen nach oben oder nach unten (Vorzeichen + oder -oder zweiseitig ±) und dürfen den vorgeschriebenen Wert nichtüberschreiten. Angaben in % vom Meßbereichsendwert.
Piezoresistiv: Veränderung des spezifischen Widerstandes bei Metallen,sehr stark bei Halbleitern, unter mechanischer Beanspruchung(vorwiegend Dehnung)
Hysterese: Größte Differenz zwischen den Meßwerten der Ausgangsgröße beigleichen Werten der zunehmenden und abnehmenden Eingangsgröße
Linearität: Die größte Annäherung einer kalibrierten Kennlinie an die ideale Gerade
Absolutdruck: Druck in einer Anlage gegenüber Druck Null im völlig leeren Raum(100% Vakuum) nach DIN 1314
Relativdruck: ? ? ?
Schutzart: Die Norm DIN 40 050 und IEC 144 behandelt den Schutz von elektrischenBetriebsmitteln durch Gehäuse, Abdeckungen, Schutz von Personengegen Berühren unter Spannung stehender Teile (Berührungs- und Fremd-körperschutz), Eindringen von Wasser (Wasserschutz). Die Schutzartensind durch zwei stets gleichbleibende Kennbuchstaben IP und zweiKennziffern für die unterschiedlichen Schutzgrade definiert.
Reproduzierbarkeit: ? ? ?
Temperatur-Koeffizient: Temperaturstöreinfluß auf den Sensor der durch geeignete Schaltungsmaßnahmen reduziert werden muß. Der verbleibende Temperaturgangwird in % vom Endwert/K angegeben und bezieht sich auf den kompensierten Temperaturbereich. Er wird für den Nullpunkt und für den Meß-bereichsendwert getrennt angegeben.
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Produkt-Linie / Product range
Handmeßgeräte der Serien 2040, 2045, 4010/20,5000 zur Erfassung unterschiedlicher Meßgrößen,Protokollierung, PC-Auswertung, Speicherung undgrafischer Darstellung.
Hand held measuring instruments of series 2040,2045, 4010/20 and 5000 for the acquisition ofdifferent measurable variables, for recording, PC-evaluation, storage and grafic display of measureddata.
Schalttafeleinbaugeräte zum Überwachen, Messenund Steuern.
Panel mounted instrument for monitoring, measuringand controlling purposes.
Sensoren für die Druck-, Temperatur- und Drehzahl-messung.
Sensors for the measurement of pressuretemperature and RPM.
scan memory printer
Speicher Drucker
Start
Stop
minmaxClear
Prog. Abtast-rate
7 98
4 65
1 32
0 ENT--,
Multi Test 4020
Unit TimeContrast
Language
IU
p1 p2 p3
TQ n
(p1-p2) p
P1: = P2: =dP: =Q : =
186,4 bar182,1 bar
4,3 bar72,50 l/min
p1
Q
Prog
ENT
T
p
p2
USSI
0-204-20
p(p1-p2)
Multi Handy 2040
OFF
ON
n
p1 = 128.6 barp2 = 117.8 bar
p1
Prog
ENT
Printer
p
p2
Qn
0-204-20
p(p1-p2)
Multi Handy 2045
OFF
ON
128.6
Stop
p1 =[bar]
T
Start
Scan
Memory
MINIMESS Prüf- und Meßkupplungen für Fluid- undGasanwendungen.
MINIMESS test point for fluid- and gas application.
MINIMESS-Schläuche kleiner Nennweiten DN 2 undDN 4 als flexible Verbindungen.
MINIMESS hoses with small nominal diameters DN2 and DN 4 as flexible connections.
Sensoren für die Volumenstrommessung:Meßturbinen und Zahnraddurchflußsensoren.
Sensors for measurement of volume flow rate:measuring turbines and gear flow meters.
Qualitätsmanagementsystemzertifiziert nach DIN EN ISO 9001
DKD-Kalibrierlabor im Deutschen KalibrierdienstKalibriergrößen: Druck und Volumendurchfluß
CE-konforme ProdukteConform products (EMC tested)
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MessenÜberwachenAnzeigenAuswertenSchnittstelle:RS 232/485
Min. Chn.1 Chn.2
Rel.1
Rel.2
Prog./Displ. Prog. Peak Channel
Max.
compareLimburg analog
SETSEG 1000
Limburg
1
2Analog
Scale
ALARM
OFF/Hy.min.
SET CALON/SP
max.
1 2 3 4
SETSEG 1000
Limburg
1
2Analog
Scale
ALARM
OFF/Hy.min.
SET CALON/SP
max.
1 2 3 4
Min. Chn.1 Chn.2
Rel.1
Rel.2
Prog./Displ. Prog. Peak Channel
Max.
compareLimburg digital
DIN EN ISO 9001 DIN EN 45001K - 05101 - 03
Kalibrierdienst
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HYDROTECHNIK GmbH . Holzheimer Straße 94-96 . D-65549 Limburg . Tel. 06431/4004-0 . Fax 45308Internet: http://www.hydrotechnik.com . e-Mail: [email protected]
8898-01-00.2508/96
Limburg
Test with confidence
Messen mit System