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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 264
Table 12-1: Front Panel Warning Messages
WARNING FAULT CONDITION POSSIBLE CAUSES
AZERO WARN
XXX.X MV
Auto-zero reading above 200 mV.
Value shown in message indicates
auto-zero reading at time warning
was displayed.
AZERO valve not working
Valve control driver failed
Bad Relay PCA
Failed +12 VDC power supply
Gas leak across AZERO Valve ports
Dirty Reaction Cell
O
3
flow problem to RCELL
BOX TEMP WARNING
Box Temp is < 7C
or > 48
C.
Box Temperature typically runs ~7
C warmer than ambient
temperature
Poor/blocked ventilation to the analyzer
Stopped Exhaust-Fan
Ambient Temperature outside of specified range
CANNOT DYN SPAN
Dynamic Span operation failed.
Measured concentration value is too high or low
Concentration Slope value to high or too low
CANNOT DYN ZERO
Dynamic Zero operation failed.
Measured concentration value is too high
Concentration Offset value to high
CONFIG INITIALIZED
Configuration and Calibration data
reset to original Factory state.
Failed Disk on Module
User erased data
CONV TEMP WARNING
NO
2
NO Converter temperature <
305
C or > 325C.
Heater configured for wrong voltage type
Failed converter Temperature Sensor
Relay controlling the Heater is not working
Failed Relay Board
DATA INITIALIZED
Data Storage in DAS was erased.
Failed Disk-on-Module
User cleared data.
HVPS WARNING
High voltage power supply output
outside of warning limits specified by
HVPS_SET variable.
No +15 VDC power supply to Preamplifier PCA
Drive voltage not adjusted properly
Failed PMT Preamplifier PCA
Dirty reaction cell
Bad pneumatic flow
IZS TEMP WARNING
Permeation tube oven temperature is
< 45
C or > 55C.
Heater configured for wrong voltage type
Failed permeation tube Temperature Sensor
Relay controlling the Heater is not working
Failed Relay Board
OZONE FLOW
WARNING
O
3
flow rate is < 50 cc/min or >
150 cc/min.
Failed Sample Pump
Blocked O
3
dryer
Blocked inlet/outlet to O
3
purifier
Dirty O
3
dryer DFU
Leak downstream of RCELL
Failed O
3
Flow Sensor
OZONE GEN OFF
Ozone generator is off. This is the
only warning message that
automatically clears itself. It clears
itself when the ozone generator is
turned on.
O
3
generator override is turned ON.
Electrical connection between motherboard and generator is
faulty.
Bad +15VDC power supply
PMT TEMP WARNING
Sample temperature is < 5C or >
12
C.
PMT fan not operating
Failed PMT Temperature Sensor
TEC not functioning
Failed PMT Preamp PCA