Teledyne 465L operation manual Sensor OK, Invalid Reading, Check Lamp, Pneumatic Error

Teledyne API Model 465L O3 Monitor Operation Manual

10.2.1.Sensor OK

The Sensor OK LED indicates the status of the O3 sensor module in the monitor. The normal state of this LED (or Status Output) is On. If this LED remains off after the normal 20 minute warm-up period, then a failure has occurred and the monitor should be removed from service and repaired.

The most common cause of this warning is a failure of the UV Lamp. A UV Lamp Adjustment (See Section 9.4) should be attempted. If the UV Lamp cannot be adjusted to meet the specified values, then a UV Lamp Replacement should be performed (See Section 9.5.)

This warning can also be caused by a communications error with the sensor module. Inspect the two cables between the Mainboard PCA and Sensor Module for loose or intermittent connections (See Section 9.2 for monitor layout.) If no cable problem can be found, then the Sensor Module should be replaced.

10.2.2.Invalid Reading

The Invalid Reading LED indicates that the instrument is reading a value that cannot be represented properly on the analog output. Since the analog output is limited to 0-5V (or 4- 20mA,) it cannot properly represent negative values, or values in excess of the full-scale range.

If the monitor is consistently reading negative values, then a zero calibration should be performed, see Section 7.2.3.4.

If the monitor is consistently reading values in excess of the full-scale range, then the range value should be adjusted higher. See Section 7.2.7 for details on setting the range value.

10.2.3.Check Lamp

The Check Lamp LED indicates that the UV Lamp intensity has dropped below 250mV, a level where UV Lamp Adjustment (See Section 9.4) should be made at the next convenient opportunity. Note that this is a non-critical warning and immediate service is not required. However if the UV Lamp intensity drops below 125mV, then the Sensor OK LED will also turn off, indicating that the monitor must be immediately serviced or taken off-line.

10.2.4.Pneumatic Error

The Pneumatic Error LED indicates that one of the pneumatic parameters, flow or pressure, has gone outside of normal ranges. Note that this is a non-critical warning and immediate service is not required. However if the Sensor OK LED turns off then the monitor must be immediately serviced or taken off line.

The first step in troubleshooting a Pneumatic Error is determining which parameter has caused the warning. At the monitor front panel, navigate to the VIEW menu (See Section

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