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TELEDYNE INSTRUMENTS
Troubleshooting 460L Instruction Manual
66 05228 Rev B
PRINTED DOCUMENTS ARE UNCONTROLLED DCN 5164
The O3 sensor is not responding to CPU requests for data. This could represent a variety
of electronic problems with the sensor module or internal communication between the CPU
and the sensor module.
11.2.2. Invalid Reading
The normal state for the Invalid Reading output is OFF. When this output turns ON, the 460L is
still operational, but a system fault or calibration fault exists that may make the current ozone
reading invalid.
The Invalid Reading output is turned ON for any of the following conditions:
The measured pressure in the measurement cell exceeds too high indicating that the O
3
supply is under pressure.
The measured pressure in the measurement cell exceeds too low indicating that there
could be a blockage in the monitor’s internal pneumatic lines.
The measured concentration has exceeded the measurement range selected for the
monitor.
The measured concentration is an excessively negative reading (less than -0.10 ppm or –
10.0 ppb).
11.2.3. Lamp Low
The normal state for the lamp low output is OFF. This output turns on when the UV lamp intensity
as measured by the reference detector has dropped below 375mV. This could mean that the lamp
has drifted has started to drift low and that the lamp output should be adjusted.
11.2.4. Status LED / Status Output Troubleshooting Summary
Table 11-2 below is a logic truth table summarizing the recommended actions based on the states
of the four status front panel status LED’s. A ‘1’ indicates the LED is ON, a ‘0’ indicates the LED is
OFF, and ‘X’ indicates the LED can be in either state.