Servomex 01440002D, Service Manual

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01440D Light Industrial Gas Analyser Service Manual. 2.5
5. Connect a nitrogen supply to the analyser, flow or pressure rates as
per section 2.2.
6. Ensure the electrical safety of all parts and power-up the analyser.
SETTING THE ZERO (follows on from cell change procedure)
7. Set the ZERO on the front panel to mid point (5 turns from either
end).
8. Adjust the ZERO pot on the top of the transducer, so that the display
reads 0
±
2% O
2
.
9. Set the ZERO on the front panel so that the display reads 0
±
0.1%
O
2
.
SETTING THE SPAN (follows on from setting the zero)
10. Adjust the FINE SPAN pot on the top of the transducer fully
clockwise. The potentiometer will ‘click’ when it reaches the end.
11. Adjust the SPAN on the front panel fully clockwise.
12. Connect an air supply to the analyser, flow or pressure rates as per
section 2.2.
13. Adjust the COARSE SPAN pot on the top of the transducer, so that
the front panel displays a nominal 120% of air, approximately 25.1%
O
2
.
14. Adjust the SPAN on the front panel fully counter clockwise.
15. Adjust the FINE SPAN pot on the top of the transducer, so that the
display reads 93% of air, approximately 19.5% O
2
.
16. Refit the foam cover from transducer of the transducer and allow the
analyser to stabilise.
17. Adjust the SPAN on the front panel so that the display reads 20.9
±
0.1% O
2
.