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T400 Ozone Analyzer Operator’s Manual Troubleshooting & Service
249
Table 12-2: Test Functions - Indicated Failures
TEST FUNCTION DIAGNOSTIC RELEVANCE AND CAUSES OF FAULT CONDITIONS.
TIME
Time of Day clock is too fast or slow. To adjust see Section 5.6.
Batter
y in clock chip on CPU board may be dead.
RANGE
Incorrectly, configured Measurement Range(s) could cause response problems with a Data
logger 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 stability of the O
3
concentration of Sample Gas.
O3 MEAS
&
O3 REF
If the value displayed is too high the UV Source has become brighter. Adjust the variable
gain potentiometer on the UV Preamp Board in the optical bench.
If the value displayed is too low:
< 100mV – Bad UV lamp or UV lamp power supply.
< 2000mV – Lamp output has dropped, adjust UV Preamp Board or replace lamp.
If the value displayed is constantly changing:
Bad UV lamp.
Defective UV lamp power supply.
Failed I
2
C Bus.
If the O
3
Ref value changes by more than 10mV between zero and span gas:
Defective/leaking switching valve.
PRES See Table 11-1 for SAMPLE PRES WARN.
SAMPLE FL
Check for Gas Flow problems. See Section 12.4
SAMPLE TEMP
Temperatures outside of the specified range or oscillating temperatures are cause for
concern.
PHOTO LAMP
Bench temp control improves instrument noise, stability and drift. Temperatures outside of
the specified range or oscillating temperatures are cause for concern. See Table 11-1 for
PHOTO TEMP
W
ARNING.
BOX TEMP
If the Box Temperature is out of range, check fan in the Power Supply Module. Areas to the
side and rear of instrument should allow adequate ventilation.
See Table 11-1 for BOX TEMP WA
RNING.
O3 GEN TEMP
If the O
3
Generator Temperature is out of range, check the O
3
Generator heater and
temperature sensor. See Table 11-1 for O3 GEN TEMP W
ARNING.
SLOPE
Values outside range indicate:
Contamination of the Zero Air or Span Gas supply.
Instrument is miss-calibrated.
Blocked Gas Flow.
Faulty Sample Pressure Sensor (P1) or circuitry.
Bad/incorrect Span Gas concentration.
OFFSET
Values outside range indicate:
Contamination of the Zero Air supply.
06870C DCN6332