STATUS SCIENTIFIC CONTROLS
FGD3 Infrared Gas Detector Heads
TD06/024
Issue:
7
Change Note:
1904
Page 28
5.3 FGD3 Head Indications
The FGD3 Infrared Detector Head
will flash ‘F xx’ if fault is detected. This will coincide
with the head drawing a current of less than 2.0mA from the control unit, thus ensuring
the control unit is aware of the fault condition.
Note:
xx is a number that defines a particular fault as follows:
1
Checksum error.
2
Zero calibration error.
4
Span calibration error.
8
Sensor reference low output.
16 Sensor reference high output.
32 Sensor detector low output.
64 Sensor detector high output.
When multiple fault conditions occur the xx is the combination of the
above fault numbers, e.g. ‘F 6’ indicates that the FGD3 requires both
a zero gas and span gas calibration.
