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TELEDYNE INSTRUMENTS
460L Instruction Manual Troubleshooting
05228 Rev B 65
DCN 5164 PRINTED DOCUMENTS ARE UNCONTROLLED
11. TROUBLESHOOTING
This chapter gives guidelines for diagnosing system and sensor malfunctions using the five digital
Status Outputs provided by the 460L. All troubleshooting should be done after the 460L has been
turned on and allowed to warm up for at least 15 minutes.
11.1. Status Output Summary
Table 11-1 below gives a summary of the operation of the Status Outputs on the 460L. See
Section 3.5.2 Digital Status Outputs for information on connecting these outputs.
Table 11-1 Digital Status Outputs Definitions
OUTPUT
#
NAME ON STATE OFF STATE
LED on
FRONT
PANEL
1
Sensor
O.K.
Normal State
Measure > 1230mV;
Reference > 1230mV;
UV Lamp Off (Reference < 250 mV);
No data from The O
3
sensor
YES
2
Invalid
Reading
Pressure > 14.9 psia;
Pressure < 9 psia;
Negative Ozone Concentration;
Concentration Over-Range
Normal State
YES
3 Lamp Low
Reference <375 mV
Normal State
YES
4
Alarm
Active
Either the HI or the HI-HI O
3
concentration alarm is active
No O
3
Concentrati0on alarms are active
YES
5 HI Alarm
Measured O
3
concentration is ≥
than the HI alarm set point
Normal State
NO
6
HI-HI
Alarm
Measured O
3
concentration ≥ the
HI-HI alarm set point
Normal State
NO
11.2. Troubleshooting Using Status Outputs
11.2.1. Sensor OK
The normal state for the Sensor OK output in ON. During the warm-up period on start-up this
output will stay off until the UV lamp reaches a minimum intensity. If this output remains OFF
after the 15 minute warm-up period, or goes off during normal operation the 460L is in need of
servicing.
If the Sensor OK output turns OFF
One of the analog voltages output by the sensor module (reference / measure) is too high.
This could mean that the lamp output has drifted high
The reference voltage output by the sensor module (reference / measure) is too low. This
could mean that the lamp intensity has drifted very low or the lamp is completely off.