Gammapilot M
Endress+Hauser 11
Behavior of device in the event of alarms and warnings
Error current
The output current in the event of an alarm is fixed at a value ≥ 21 mA.
In some cases output currents ≤ 3.6 mA may occur (e.g. if the power supply fails or a line breaks or if there is
an error in the current output itself and the error current ≥ 21 mA can not be set).
For alarm monitoring, the logic unit must therefore be able to detect HI alarms (≥ 21 mA) and LO alarms
(≤ 3.6 mA).
Alarm and warning messages
The alarm and warning messages, which are output as error codes, provide additional information. The
following table shows the correlation between the error code and the current output:
Behavior of device in the event of interference radiation
The Gammapilot M provides two methods for dealing with interference radiation caused by non-destructive
material testing for example.
Detection of interference radiation (gammagraphy)
When the Gammapilot M is used in safety-related applications, the pulse rate is monitored to ensure that it
stays within the calibrated range. If the pulse rate is greater than the calibration value for "free" or less than the
calibration value for "covered", the current output switches to 3.8 mA for the duration of the configured hold
time of maximum 999 s.
"
Caution!
An overfill can not be detected during this time.
If the pulse rate is still outside the calibrated range when the hold time elapses, the Gammapilot M switches
to alarm condtion until the pulse rate is again inside the calibrated range between full and empty calibration.
"
Caution!
If x-ray tests are carried out within the sytem or in its immediate vicinity, or if any other sources of interference
are present, alternative measures must be taken to maintain safety during the hold time.
Error code *
1
Current output (message type) Note
Axxx ≥ 21 mA or ≤ 3.6 mA (alarm) xxx = three-digit number
Wxxx corresponding to measuring mode xxx = three-digit number
A692 ≥ 21 mA (alarm) Gammagraphy detected (alarm)
W693 3.8 mA ± 0.05 mA (warning) Gammagraphy detected (warning)
W640 ≤ 3.6 mA (SIL lock device W640) Locking sequence in operation
*
1
The error codes are listed in the Operating Instructions BA00236F/00/EN, Section "Error codes".
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