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Troubleshooting & Service T400 Ozone Analyzer Operator’s Manual
248
WARNING FAULT CONDITION POSSIBLE CAUSES
O3 GEN TEMP
WARNING
IZS Ozone Generator
Temp is outside of
control range of 48C
3C.
No IZS option installed, instrument improperly configured
O
3
generator heater
O
3
generator temperature sensor
Relay controlling the O
3
generator heater
Entire Relay Board
I
2
C Bus
SYSTEM RESET
The computer has
rebooted.
This message occurs at power on.
If it is confirmed that power has not been interrupted:
Failed +5 VDC power
Fatal Error caused software to restart
Loose connector/wiring
Note A failure of the analyzer’s CPU or Motherboard can result in any or ALL
of the following messages.
12.1.2. FAULT DIAGNOSIS WITH TEST FUNCTIONS
Besides 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 analyzers Theory 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 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.
Note A value of “XXXX” displayed for any of these TEST functions indicates an
OUT OF RANGE reading.
Note 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.
06870C DCN6332