Dräger PEX 1000 Manual De Instrucciones página 29

max. cable length see table in chapter 3.1.2
PEX 1000
Typ XTR 0090,
XTR 0091
OK
shielding
Connection to the controller:
Connect terminal +24 V to +24 volts
Connect terminal SIG to 4 to 20 mA input
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shielding in
insertion fitting
sensing head
Polytron SE Ex PR ... DQ
1 2 3
and
1 2 3
Polytron SE Ex LC ... DD
power supply
+24 volt
24 V 20 %,
0 volt
0,15 A
4 to 20 mA
0 mA
controller unit
Connect terminal 0 V to 0 Volt
Connection to the sensing head:
Connect terminal br/br to terminal 1
Connect terminal ge/yw to terminal 2
Connect terminal sw/bk to terminal 3
5.3 Commissioning the transmitter
After turning on the supply voltage, all 14 LED segments including both points
are activated for approx. 5 seconds to make sure that they are not faulty ("Lamp
test"). During this period, internal test routines start running in the PEX 1000,
the output signal of the PEX 1000 is 1 mA.
After this, the display changes, with approx. 1 Hz, between two horizontal lines
and the currently measured value. During this time, the PEX 1000's output is
3.4 mA.
After one minute the PEX 1000 is ready for operation.
5.3.1 Calibrating the transmitter
5.3.1.1 Calibrate zero-point
To enter the calibration menu, press the ▼ key for more than one second but
less than three seconds. The display shows ZE and a flashing point on the
bottom right indicating the calibration mode.
– Confirm with keys (▲+▼). The measured signal is set to 3.4 mA to indicate
the calibration mode to the controller.
– Apply gas to the sensor – either
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Operation
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