Fault Diagnosis With Test Functions - Teledyne T200 Operation Manual

Troubleshooting & Service

12.1.2. FAULT DIAGNOSIS WITH TEST FUNCTIONS

Note
Note
Table 12-2: Test Functions - Indicated Failures
TEST FUNCTION
NOX STB
SAMP FlW
OZONE FL
PMT
NORM PMT
AZERO
HVPS
RCELL TEMP
BOX TEMP
PMT TEMP
IZS TEMP (option)
MOLY TEMP
RCEL (pressure)
SAMP (pressure)
232
Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
In addition to being useful as predictive diagnostic tools, the test functions viewable
from the analyzers front panel can be used to isolate and identify many operational
problems when combined with a thorough understanding of the analyzer‟s principles of
operation (see Section 13).
The acceptable ranges for these test functions are listed in the "Nominal Range" column
of the analyzer Final Test and Validation Data Sheet (P/N 04490) shipped with the
instrument. Values outside these acceptable ranges indicate a failure of one or more of
the analyzer‟s subsystems. Functions whose values are still within acceptable ranges but
have significantly changed from the measurement recorded on the factory data sheet
may also indicate a failure.
A worksheet has been provided in Appendix C to assist in recording the value of these
test functions.
A value of ―XXXX‖ displayed for any of these TEST functions indicates an OUT
OF RANGE reading.
Sample Pressure measurements are represented in terms of ABSOLUTE pressure
because this is the least ambiguous method reporting gas pressure.
Absolute atmospheric pressure is about 29.92 in-Hg-A at sea level. It decreases
about 1 in-Hg per 1000 ft gain in altitude. A variety of factors such as air
conditioning systems, passing storms, and air temperature, can also cause
changes in the absolute atmospheric pressure.
Unstable concentrations; leaks
Leaks; clogged critical flow orifice
Leaks; clogged critical flow orifice
Calibration off; HVPS problem; no flow (leaks)
Auto Zero too high
Leaks; malfunctioning NO, NO
Calibration off; preamp board circuit problems
Malfunctioning heater; relay board communication (I
Environment out of temperature operating range; broken thermistor
TEC cooling circuit broken; relay board communication (I
Malfunctioning heater; relay board communication (I
Malfunctioning heater; disconnected or broken thermocouple; relay board communication
2
(I C bus); relay burnt out; incorrect AC voltage configuration
Leak; malfunctioning valve; malfunctioning pump; clogged flow orifices
Leak; malfunctioning valve; malfunctioning pump; clogged flow orifices; sample inlet
INDICATED FAILURE(S)
or Auto Zero valve; O air filter cartridge exhausted
x 3
2
C bus); relay burnt out
2
C bus); relay burnt out
2
C bus); 12 V power supply
06858E DCN7057