5.40
- On amplifier boards 01100925 and 01100925A adjustments are made by changing the value of
resistor R41. Use only the special resistors supplied by Servomex, part numbers as follows:
5K ohm - 2621-1989
2.5K ohm - 2621-1996
In extreme cases it may be necessary to fit two resistors in parallel.
To make the adjustment proceed as follows:
1. Perform a zero calibration, see Section 3.6.
2. Pass span gas (100% Oxygen) through the analyser.
3. Display the uncompensated oxygen reading and allow the reading to stabilise.
DISPLAY Lo
1
4
4. Adjust value of R41, or position of O
2
coarse gain links, so that the reading on parameter
14 is between 80 and 118.
5. Perform a normal span calibration, see Section 3.6
5.4 SAMPLING SYSTEM REPAIR
The filter element should be checked once a week if the analyser is in continuos use. Th analyser
must not be operated without the filter element in place because dust and other particulates will
permanently damage the measuring cell.
The filter element may be inspected by unscrewing the filter plug on the front of the sample
block. If dirty or wet, the filter element must be discarded and a new one fitted.
5.4.1 Dry Gas Sampling System 1161
5.4.1.1 Disassembly and Cleaning of Flow meters
See Figure .7
Note: The flowmeter tubes are fragile and excessive force will break them.
1. Turn of gas supplies to the analyser.
2. Slide cover (1) off vertically until released.
3. Remove plastic wedge (2) by pulling forward until it is released.
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