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Troubleshooting & Repair Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 272
Table 13-2: Test Functions - Indicated Failures (cont.)
TEST
FUNCTIONS
(As Displayed)
INDICATED FAILURE(S)
PHT DRIVE
If this drive voltage is out of range it may indicate one of several problems:
A poor mechanical connection between the photodetector, its associated mounting hardware and the
absorption cell housing;
An electronic failure of the IR Photo-Detector’s built-in cooling circuitry, or;
A temperature problem inside the analyzer chassis. In this case other temperature warnings would also be
active such as BENCH TEMP WARNING or BOX TEMP WARNING.
SLOPE
Values outside range indicate
Contamination of the zero air or span gas supply
Instrument is Miscalibrated
Blocked gas flow
Contaminated or leaking GFC Wheel (either chamber)
Faulty IR photo-detector
Faulty sample faulty IR photo-detector pressure sensor (P1) or circuitry
Invalid M/R ratio (see above)
Bad/incorrect span gas concentration due.
OFFSET
Values outside range indicate
Contamination of the zero air supply
Contaminated or leaking GFC Wheel (either chamber)
Faulty IR photo-detector