Servomex SERVOTOUGH LaserExact 2950, Operator'S Manual

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SERVOTOUGH LaserExact Monitor, Operator Manual 02950001A_1
OPERATION
49
Fault message Explanations and actions
« Low transmission » WARNING
The optical transmission has dropped below the limit for
reliable measurements. This might indicate
misalignment of the optical units or contamination of the
mirrors in the cell. Check alignment and replace cell if
necessary.
« Laser line-up error » ERROR
The laser beam does not reach the detector. Check
alignment and replace cell if necessary.
« PLC T-read error » ERROR
Failure reading temperature through 4-20 mA PLC input.
Input current from temperature sensor is either above
23.7 mA or below 0.3 mA. Check connections to
temperature sensor or use fixed temperature setting in
the SERVOTOUGH LaserExact Monitor.
« PLC P-read error » ERROR
Failure reading pressure through 4-20 mA PLC input.
Input current from pressure sensor is either above 23.7
mA or below 0.3 mA. Check connections to pressure
sensor or use fixed pressure setting in the
SERVOTOUGH LaserExact Monitor.
« T-read out of range » WARNING
Input current from temperature sensor is either above 22
mA or below 3.2 mA. The measured gas temperature
may be wrong. Check temperature sensor or use fixed
temperature setting in the SERVOTOUGH LaserExact
Monitor.
« P-read out of range » WARNING
Input current from pressure sensor is either above 22
mA or below 3.2 mA. The measured gas pressure may
be wrong. Check pressure sensor or use fixed
temperature setting in the SERVOTOUGH LaserExact
Monitor.
« P/T out of range » WARNING
Pressure and temperature compensation is outside
acceptable range. The accuracy of the measured gas
concentration may be reduced. If supplied values are
correct, the instrument is operating outside
specifications.