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Millwatch/Silowatch
Single Stream
User Guide
18 Diagnostics
18.1 Fault Messages
To check the fault messages press DIAGS.
The number of system faults is displayed. Press DIAGS again to list individual
messages.
The diagnostics display has no affect on the operation of the monitor.
Fault
Possible Cause
Suggested Solution
ADC FAULT
Microprocessor failure may cause
false readings
Contact LAND
*COOLER FAILURE
Cooler is less than 10% below
ambient for more than 5 minutes
Electronic fault, cooler fault
Ambient temperature is too high
Check air supply to cooler
Contact LAND
ZERO DRIFT
Gas sensor has failed
New sensor is settling
Sample gas is entering the monitor
Contaminated ambient air
Replace sensor assembly
Reset faults and recheck
Check for leaks
May correct itself at next change
over
SPAN COEFFICIENT OUT OF LIMITS
Sensor saturated, the sensor has
been exposed to excessive amounts
of CO. The sensor will recover if run
on air
Sensor expired
Calibration has failed
Calibration gas is not reaching
sensors
Reset the fault
Replace sensor assembly
Check calibration gas concentration
in setup menu matches calibration
gas certificate
Check for leaks in sample path
FLOW RATE FAULT
Low sample gas flow
Sample pump failed
Either gas stream probe, probe filter
or sample line blocked
Sample chiller failed (frozen)
Replace pump
Remove probe and clean
Replace sample chiller
*PERISTALTIC PUMP FAILURE
Faulty connection to pump
Pump failed
Check condensate pump is running?
(does it turn when power on?)
Replace pump
5V REF FAULT
Electronics fault
Contact LAND
FAIL IN CALIBRATION
This message is followed by one of
the following
CALIBRATION ABORTED
Calibration was stopped by an
operator
Repeat calibration
NO CAL GAS
No calibration gas is available
Check calibration gas cylinder
pressure gauge replace the
calibration gas when gauge reads
less than 20 bar (290 psi). Check
that the calibration gas pressure
regulator is switched on. Check the
pipe work is connected correctly.
Leak test the pipe work.
*EEPROM CHECKSUM ERROR
Electronic error
Contact LAND
*These errors will cause the monitor to shutdown. During this time all outputs will read zero. The monitor will
automatically return to normal operation when the faults are rectified.
