Filter
Top Products
7.0 Sensor and System Troubleshooting
This chapter gives guidelines for diagnosing system and sensor malfunctions using the
five digital Status Outputs provided by the M460H. All troubleshooting should be done
after the M460H has been turned on and allowed to warm up for at least 15 minutes.
7.1 Status Output Summary
Table 7-1 below gives a summary of the operation of the five Status Outputs on the
M454H. See 2.4.2 Digital Status Outputs for information on connecting these outputs.
Table 7-1: Digital Status Outputs
Output
#
Name On State Off state
1 Sensor O.K. Normal State Reference or
Measure > 4995mV;
Reference < 1000mV
2 Invalid Reading Pressure > 45 psia,
Negative Ozone
Concentration,
Concentration Over-
Range
Normal State
3 Lamp Low Reference
Detector<2500mV
Normal State
4 Cell Dirty Measure/Reference
ratio < 0.5 (zero gas)
Normal State
5 Auto-Zero Error Auto-Zero Failed Normal State
7.2 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,
then the M460H is in need of servicing.
If the Sensor O.K. output turns off AND the Lamp Low output is on, this indicates that
the lamp intensity has below the minimum level required for proper operation.
If the Sensor O.K. output turns off and the Lamp Low output is also off, then one of the
analog voltages in the sensor has exceeded the range of the internal A/D converter.
Adjustment by qualified service personnel is required.
P/N 03662D Teledyne API Model 460H O
3
Monitor Operator Manual - Page 34