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T400 Ozone Analyzer Operator’s Manual Troubleshooting & Service
247
Table 12-1: Warning Messages in Display Param Field
WARNING FAULT CONDITION POSSIBLE CAUSES
PHOTO TEMP WARNING
The optical bench
temperature lamp temp
is 51C.
Bench lamp heater
Bench lamp temperature sensor
Relay controlling the bench heater
Entire Relay Board
I
2
C Bus
“Hot” Lamp
BOX TEMP WARNING
Box Temp is < 5C
or > 48C.
Box Temperature typically runs ~7C 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
DATA INITIALIZED
Data Storage in DAS
was erased.
Failed Disk on Module
User cleared data.
LAMP STABIL WARN
Reference value is
unstable.
Faulty UV source lamp
Noisy UV detector
Faulty UV lamp power supply
REAR BOARD NOT DET
Motherboard not
detected on power up.
THIS WARNING only appears on Serial I/O COM 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 < 500
cc/min or > 1000 cc/min.
Failed Sample Pump
Blocked Sample Inlet/Gas Line
Dirty Particulate Filter
Leak downstream of Critical Flow Orifice
Failed Flow Sensor
SAMPLE PRES 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
SAMPLE TEMP WARN
Sample temperature is <
10C or > 50C.
Ambient Temperature outside of specified range
Failed Sample Temperature Sensor
Relay controlling the Bench Heater
Failed Relay Board
I
2
C Bus
PHOTO REF WARNING
Occurs when Ref is
<2500 mVDC or
>4950 mVDC.
UV Lamp
UV Photo-Detector Preamp
06870C DCN6332