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Teledyne API Model 465L O
3
Monitor Operation Manual
80 05509F DCN6409
10.2. Troubleshooting Using Front Panel Status
LED’s or Status Outputs
The M465L has 4 front-panel status LED’s that reflect the current operating status of the
monitor, and indicate fault conditions. There are also four relay Status Outputs on the rear panel
(or internally in the NEMA configuration) that also reflect the state of these status LED’s. See
Section 4.2.3 for more information on the Status Outputs.
The Status LED’s are categorized into Critical and Non-Critical warnings. Critical warnings are
those that would normally require immediately removing the monitor from service and repairing
it. Non-critical warnings are those that indicate some maintenance would be useful, but not
immediately required.
Table 10-1: Status LED/Output Definitions
Status
Output #
Status LED
Label
Normal
Operatin
g State
Triggers Critical
Warning?
1 Sensor OK On
No bench communications
Reference < 125.0 mV
Reference > 1230.0 mV
Yes
2 Invalid Reading Off
O
3
Concentration < -10.0 PPB
O
3
Concentration > F.S. Range
No
3 Check Lamp Off
Reference < 250.0 mV
No
4 Pneumatic
Error
Off
Pressure < 9.0 psia
Pressure > 14.9 psia
Flow < 640 cc/min
Flow > 960 cc/min
No