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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 265
WARNING FAULT CONDITION POSSIBLE CAUSES
RCELL PRESS WARN
Sample Pressure is <15 in-Hg or >
35 in-Hg
Normally 29.92 in-Hg at sea level
decreasing at 1 in-Hg per 1000 ft of
altitude (with no flow – pump
disconnected).
If Sample Pressure is < 15 in-HG:
Blocked Particulate Filter
Blocked Sample Inlet/Gas Line
Failed Pressure Senor/circuitry
If Sample Pressure is > 35 in-HG:
Bad Pressure Sensor/circuitry
Pressure too high at Sample Inlet.
RCELL TEMP WARNING
RCELL temperature is < 45C or >
55
C.
Heater configured for wrong voltage type
Failed RCELL Temperature Sensor
Relay controlling the heater is not working
Failed Relay Board
I
2
C Bus
REAR BOARD NOT DET
Motherboard not detected on
power up.
This WARNING only appears on Serial I/O COMM Port(s) Front
Panel Display will be frozen, blank or will not respond.
Failure of Motherboard
RELAY BOARD WARN
The CPU cannot communicate with
the Relay Board.
I
2
C Bus failure
Failed Relay Board
Loose connectors/wiring
SAMPLE FLOW WARN
Sample flow rate is < 350 cc/min or >
600 cc/min.
Failed Sample Pump
Blocked Sample Inlet/Gas Line
Dirty Particulate Filter
Leak downstream of RCELL Critical Flow Orifice
Failed Sample Pressure Sensor
Failed Vacuum Pressure Sensor
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, motherboard or power supplies can result
in any or ALL of the above messages.