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TELEDYNE INSTRUMENTS
460L Instruction Manual Troubleshooting
05228 Rev B 67
DCN 5164 PRINTED DOCUMENTS ARE UNCONTROLLED
Table 11-2 Status LED / Output Trouble shooting Truth Table
SENSOR
OK
INVALID
READING
LAMP
LOW
ACTIONS
1 0 0
Normal operation, no action required.
0 0 0
The Lamp intensity has drifted and is too high for proper operation.
Adjust the lamp.
The O
3
sensor is not responding to request from the CPU for data.
1 X 1
UV Lamp output is starting to drift low.
Adjust the lamp output.
0 X 1
The UV lamp is either completely off or its intensity has drifted so low
that the monitor can not reliable measure O
3
.
Replace the UV lamp (see Section 9.3).
X 1 X
O
3
reading is above the upper limit of the range selected for the
monitor.
Check or change the range setting (see Sections 7.3.9 to 7.3.11).
O
3
reading is too negative.
Calibrate zero point (see Section 8.1).
Possible Internal blockage.
check or replace the filter (see Section 9.1.1).
O
3
supply under high pressure.
Check gas lines from O
3
source.
11.3. Concentration Alarm Outputs
Table 11-3 Alarm Output Troubleshooting
FAULT CONDITION POSSIBLE CAUSES
Pressing ALARM ACKNOWLEDGE button does
not clear alarm or turn off Alarm Active LED.
Alarm mode is set for Non-Latching and Concentration value is ≥
relevant alarm set point.
ALARM ACKNOWLEDGE button is bad.
Using the ALMACK command over the serial
port does not clear alarm or turn off Alarm
Active LED.
Alarm mode is set for Non-Latching and Concentration value is ≥
relevant alarm set point.
Alarm Active LED doesn’t blink when one or
both Alarms are active
LED has Failed.
Display driver PCA malfunction
Alarm does not activate at expected O
3
concentration
Set point for alarm is set incorrectly
Alarm Active Status Output OFF when HI alarm
or HI-HI Alarm is active
Electronic failure of Alarm Active status output.
Hi alarm or HI-HI alarm status output is OFF
when O
3
concentration is ≥ related set point
value
Electronic failure of status output.