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Teledyne API Model 465L O 3 Monitor Operation Manual
10.2.1. Sensor OK
The Sensor OK LED indicates the status of the O
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.
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 7.2.4.) Examine the Flow and Pressure values and compare them to
the limits described in Table 10-1 and take appropriate action as described below.
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Note that this is a non-critical warning and
Teledyne API Model 465L O
3
sensor module in the monitor.
3
Monitor Manual
05509G DCN6806
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Table of Contents
Troubleshooting
