Advertisement
Thermo Fisher Scientific
Alarm Message
Possible Cause
Alarm – Ozonator Flow
Ozone flow low
Alarm - Zero Check
Instrument out of calibration
Alarm - Span Check
Alarm - Zero Autocal
Alarm - Span Autocal
Alarm – NO, NO
, NO
Concentration has exceeded
2
x
Conc.
range limit
Concentration low
Alarm - Motherboard
Internal cables not connected
Status
properly
Alarm - Interface
Board is defective
Status
Alarm - I/O Exp Status
Troubleshooting
Troubleshooting Guides
Action
blocked. Disconnect sample
particulate filter from the
sample bulkhead, if flow
increases, replace the filter.
Check ozone capillary (0.008
inch ID) for blockage. Replace
as necessary.
Recalibrate instrument.
Check gas supply. Perform
manual calibration.
Check to insure range
corresponds with expected
value. If not select proper
range.
Check user-defined low set
point, set to zero.
Check that all internal cables
are connected properly.
Recycle AC power to
instrument. If still alarming,
change board.
Model 42i Trace Level Instruction Manual
6-5
Advertisement
Troubleshooting
