TROUBLESHOOTING & REPAIR PROCEDURES
Model 300E Carbon Monoxide Analyzer
Instruction Manual
192
P/N 04288 Rev: A
Table 11-2: Test Functions - Indicated Failures
Test
Functions
(
As Displayed)
Indicated Failure(s)
TIME
Time of Day clock is too fast or slow
§
To adjust see Section 7.3.6.
§
Battery in clock chip on CPU board may be dead.
RANGE
Incorrectly configured Measurement Range(s) could cause response problems with a
Datalogger or Chart Recorder attached to one of the Analog Output.
If the Range selected is too small, the recording device will over range.
If the Range is too big, the device will show minimal or no apparent change in readings.
STABIL
Indicates noise level of instrument or Co concentration of Sample Gas (see Section 11.4.2
for causes).
CO MEAS
&
CO REF
If the value displayed is too high the IR Source has become brighter. Adjust the variable
gain potentiometer on the Sync/Demod Board
If the value displayed is too low or constantly changing
AND:
The
CO REF
is OK:
§
Failed Multiplexor on the Mother Board
§
Failed Sync/Demod Board
§
Loose Connector or wiring on Sync/Demod Board
The
CO REF
is also BAD:
§
GFC Wheel stopped or rotation is too slow
§
Failed Sync/Demod Board IR Source
§
Failed IR Source
§
Failed Relay Board
§
Failed I
2
C Bus
§
Failed IR Photo-Detector
MR Ratio
When the analyzer is sampling Zero Air and the ratio is too low:
§
The Reference Cell of the GFC Wheel is contaminated or leaking.
§
The alignment between the GFC Wheel and the Segment Sensor, the M/R Sensor or
both is incorrect.
§
Failed Sync/Demod Board
When the analyzer is sampling Zero Air and the ratio is too high:
§
Zero Air is contaminated
§
The alignment between the GFC Wheel and the Segment Sensor, the M/R Sensor or
both is incorrect.
§
Failed Sync/Demod Board
§
Failed IR Photo-Detector
PRES
§
See Table 11-1 for
SAMPLE PRES WARN
SAMPLE FL
Check for Gas Flow problems. See Section 11.3.
SAMPLE
TEMP
Sample temp should be close to
BENCH TEMP
. Temperatures outside of the specified range
or oscillating temperatures are cause for concern
BENCH
TEMP
Bench temp control improves instrument noise, stability and drift. Temperatures outside of
the specified range or oscillating temperatures are cause for concern. See Table 10-1 for
BENCH TEMP WARNING
WHEEL
TEMP
Wheel temp control improves instrument noise, stability and drift. Outside of set point or
oscillating temperatures are cause for concern. See Table 11-1 for
WHEEL TEMP
WARNING