Fault Diagnosis With Test Functions - Teledyne T101 Operation Manual

Troubleshooting & Service

9.1.2. FAULT DIAGNOSIS WITH TEST FUNCTIONS

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Besides being useful as predictive diagnostic tools, the TEST functions, viewable from
the front panel, can be used to isolate and identify many operational problems when
combined with a thorough understanding of the analyzer's theory of operation (Section
10). We recommend use of the APICOM remote control program to download, graph
and archive TEST data for analysis, and long-term monitoring of diagnostic data.
The acceptable ranges for these test functions are listed in Table A-3 in Appendix A-3.
The actual values for these test functions on checkout at the factory were also listed in
the Final Test and Validation Data Sheet, which was shipped with the instrument.
Values outside the acceptable ranges indicate a failure of one or more of the analyzer's
subsystems. Functions with values that are within the acceptable range but have
significantly changed from the measurements recorded on the factory data sheet may
also indicate a failure or a maintenance item. A problem report worksheet has been
provided in Appendix C to assist in recording the value of these test functions. The
following table (Table 9-2) contains some of the more common causes for these values
to be out of range.
Table 9-2. Test Functions - Possible Causes for Out-Of-Range Values
TEST FUNCTION
1
H2S STB
Unstable concentrations; leaks
SAMPLE FL Leaks; clogged critical flow orifice
PMT
C alibration error; HVPS problem; PMT problem; No flow (leaks)
NORM PMT C alibration error; HVPS problem; PMT problem
HVPS
HVPS broken; preamp board circuit problems
Malfunctioning heater; relay board communication (I
RCELL TEMP
burnt out
Environment out of temperature operating range; broken
BOX TEMP
thermistor; runaway heater
TEC cooling circuit broken; High chassis temperature; 12V power
PMT TEMP
supply
IZS TEMP Malfunctioning heater; relay board communication (I
burnt out
(OPTION)
Malfunctioning heater or temperature sensor; relay board
CONV TEMP
communication (I
Leak; malfunctioning valve; malfunctioning pump; clogged flow
PRESS
orifices; sample inlet overpressure;
C alibration error; span gas concentration incorrect; leaks; low lamp
1
H2S SLOPE
output
Incorrect span gas concentration/contaminated zero air/leak; low-
H2S OFFS 1
level calibration off
Internal clock drifting; move across time zones; daylight savings
TIME OF DAY
time?
1
Shown as they appear when analyzer is in H
SO2 OFFS & SO2 SLOPE. In multigas mode, both versions appear.
Teledyne ML - T101 Operation Manual
INDICATED FAILURE(S)
2
C bus); relay burnt out
S mode. In SO mode appear as SO2 STB,
2 2
2
C bus); relay
2
C bus); relay