Thermo Scientific 49i Instruction Manual page 167

Thermo Fisher Scientific
Table 6-2. Troubleshooting - Alarm Messages, continued
Alarm Message Possible Cause
Alarm - Intensity A Pre-amp Gain not set properly
Alarm - Intensity B
Defective measurement interface
board
Alarm - Zero Check Instrument out of calibration
(Opt)
Alarm - Span Check
(Opt)
Alarm - Zero Autocal
(Opt)
Alarm - Span Autocal
(Opt)
Alarm - Oz Level 1
Check (Opt)
Oz Level 2 Check (Opt)
Oz Level 3 Check (Opt)
Oz Level 4 Check (Opt)
Oz Level 5 Check (Opt)
Alarm - O Conc. Concentration has exceeded range
3
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
If using sample particulate
filter make sure it is not
blocked. Disconnect sample
particulate filter from the
sample bulkhead, if flow
increases, replace the filter.
Check Gain adjustment.
Replace measurement
interface board.
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 49i Instruction Manual 6-5