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Dräger Polytron 7000
Use
– Disabled alarms (display readout and analogue/digital measured value readout
remains active)
– Calibration procedures
– Warm-up phase
– Maintenance
Conduct during warm-up phase 1
4-20-mA interface:
Maintenance signal
Relay:
Fault relay energised
During warm-up phase 1 the display shows the time remaining until warm-up phase
1 is completed.
Conduct during warm-up phase 2
4-20-mA interface:
Measured value
Relay:
Fault relay not energised
During warm-up phase 2 the display shows the measured value.
Undershooting the measuring range (O
2
sensors only)
If the measured value drops below the measuring range set, the 4-20-mA interface
emits 3.8 mA ... to 4 mA and the display shows the symbol .
If the measured value drops further, the gas detector behaves in the same way as
for a general error. The 4-20-mA interface issues the fault signal, the display shows
the symbol and the fault relay is energised.
Undershooting the measuring range is a non-latching error. If the measured value is
again in the measuring range, the error is no longer issued.
Example display
Description
Maintenance – When certain functions are invoked
(e.g. calibration, sensor replacement function), the
display shows the symbol .
4-20-mA interface:
Maintenance signal
Relay:
Energised or not energised depending on
function
General error – The display shows the symbol .
4-20-mA interface:
Fault signal
Relay:
Fault relay energised
A warning is present. The display shows the
symbol
4-20-mA interface:
Measured value
1)
Relay:
Fault relay energised (with a disabled alarm)
1) The warning signal is also issued for the measured value when a warning signal is selected.
Factory setting: Warning signal disabled.
O2
Vol.%
20.9
O2
Vol.%
20.9
