TROUBLESHOOTING & REPAIR PROCEDURES Model 400E Ozone Analyzer
Instruction Manual
246 P/N 04316 Rev: B
Table 11-1: Warning Messages (Continued)
Warning Message Fault Condition Possible Causes
DATA INITIALIZED
Data Storage in iDAS
was erased.
§ Failed Disk-on-Chip.
§ User cleared data.
FRONT PANEL WARN
The CPU is unable to
Communicate with the
Front Panel Display
/Keyboard
WARNING only appears on Serial I/O COM Port(s)
Front Panel Display will be frozen, blank or will not
respond.
§ Failed Keyboard
§ I
2
C Bus failure
§ Loose Connector/Wiring
REAR BOARD NOT DET
Mother Board 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 Mother Board
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
< 10°C or > 50°C.
§ 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
§ Relay Board
§ I
2
C Bus
§ UV Photo-Detector Preamp
O3 GEN TEMP
WARNING
IZS Ozone Generator
Temp is outside of
control range of 48°C
± 3°C.
§ No IZS option installed, instrument improperly
configured
§ O3 generator heater
§ O3 generator temperature sensor
§ Relay controlling the O3 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
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