TELEDYNE API Everywhereyoulook 480H, Руководство пользователя

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52 Teledyne API Model 480H O
3
Monitor User Manual 09421A DCN8343
8.2.1. 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 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 LED. If the UV LED
intensity has dropped to a level that cannot meet the specified values, then it should
be replaced (See Section 7.5).
8.2.2. 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 5.2.3.2.
If the monitor is consistently reading values in excess of the full-scale range, then
the range value should be adjusted higher. See Section 5.2.4 for details on setting
the range value.
8.2.3. CHECK LAMP
The Check Lamp status indicates that the UV LED intensity has dropped to a level
where the UV LED needs to be replaced (Section 7.5) the Sensor OK LED will also
turn off, indicating that the monitor must be immediately serviced or taken off-line.
8.2.4. 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.
Unless it is also accompanied by Sensor OK LED turning off, the instrument does
not need to be removed from service at this time.
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 5.2.2). Examine the Flow and Pressure values and compare them to the
limits described in Table 8-1 and take appropriate action as described below.
8.2.4.1. P
RESSURE
T
OO
H
IGH
•
The gas inlet pressure is too high. Verify that the ozone gas and zero gas
delivery pressure is regulated to between 9 and 18 psig (high pressure error
occurs when pressure exceeds 18 psig).
•
Something is restricting the flow in the monitor. Check for restriction in the
exhaust gas line. Check for kinked or obstructed tubing inside the monitor.
• The pressure sensor has failed or drifted.