Normal Operation; Configuration Of The 4 To 20 Ma Signal Output - Dräger PIR 7000 Technical Handbook

Normal Operation

Configuration of the 4 to 20 mA Signal Output
The gas transmitter generates a 4 to 20 mA signal, proportional to the measured gas
concentration, when the gas transmitter is configured for analogue signal transmission.
Current Meaning
4 mA Zero-point
20 mA Full-scale deflection
<1.2 mA Fault, non-latching
3.8 mA ... 4 mA Under-range
20 mA ... 20.5 mA Full-scale deflection exceeded
(over-range)
3 mA Maintenance signal
2 mA Beam block warning
(preventive maintenance function)
<1.2 mA Device in HART
(polling address 1 ... 15)
For the digital processing of gas transmitter data you can use:
— Dräger REGARD HART
control system (Software Version 1.2 Polytron IR)
or
®
— any HART communication tool interpreting the HART
Dräger PIR 7000 / Dräger PIR 7200
or
— Operating and display unit Dräger PEX 3300 / PEX 7300.
The gas transmitter periodically runs self tests for numerous internal functions. The gas
transmitter outputs a fault signal as soon as a deviation from normal operation is detected.
Gas transmitters with splash guard must be regularly checked for contamination of the
splash guard. Any contamination may cause an increase of the measured value response
time.
In case of contamination: Clean splash guard, replace if necessary.
®
multidrop operation
®
-channel card (part no. 42 05 900), installed in a REGARD
CAUTION
Operational Characteristics
Configurable
(0.7...3.6 mA)
No
No
Yes
No
No
Yes
Yes
No
®
commands selected for the
Factory
setting
– – –
– – –
– – –
– – –
– – –
– – –
Inactive
Disabled
51