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M400E Ozone Analyzer Operator’s Manual General Troubleshooting & Repair of the M400E Analyzer
Table 13-2: 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 6.4.3.
Battery 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 O3 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 O3 Ref value changes by more than 10mV between zero and span gas:
Defective/leaking switching valve.
PRES See Table 12-1 for SAMPLE PRES WARN.
SAMPLE FL
Check for Gas Flow problems. See Section 13.4
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 12-1 for
PHOTO TEMP WARNING.
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 12-1 for BOX TEMP WARNING.
O3 GEN TEMP
If the O3 Generator Temperature is out of range, check O3 Generator heater and
temperature sensor. See Table 12-1 for
O3 GEN TEMP WARNING.
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.
13.1.3. DIAG SIGNAL I/O: USING THE DIAGNOSTIC SIGNAL I/O
FUNCTION
04315 Rev. C1 237