Teledyne 460H Sensor and System Troubleshooting, Status Output Summary, Sensor OK, On State, Name

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,	Normal State
		Negative Ozone
		Concentration,
		Concentration Over-
		Range
3	Lamp Low	Reference	Normal State
		Detector<2500mV
4	Cell Dirty	Measure/Reference	Normal State
		ratio < 0.5 (zero gas)
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 O3 Monitor Operator Manual - Page 34