Filter
Top Products
Teledyne API Model 465L O
3
Monitor Operation Manual
05509F DCN6409 81
10.2.1. Sensor OK
The Sensor OK LED indicates the status of the O
3
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