3 Instrument instructions
3.1 Instructions
The air has a high level of oxygen in it,about 209,000ppm.Since trace
oxygen analyzers are intended to measure very low levels it is
important that the sensor is not swamped with oxygen from the
air.Trace analyzer has a special valve-the '' Sample/Bypass'' valve-that
seals off the sensor from air contamination during transit.Make sure
you don't turn the valve until you have a low oxygen level gas ready to
flow through the analyzer, otherwise oxygen from the air will get into
the sensor and cause it to react sluggishly. This valve not only seals off
the sensor,but also allows gas to flow through the rest of the sample
passages,thus allowing you to purge them prior to measuring a sample
gas.
The analyzer also has a needle valve the is arranged in such a way that
it controls both the bypass flow when the Sample/Bypass valve is in
the "OFF"position,and also the sample flow,when the Sample/Bypass
valve is turned to "ON"(the sampling position).In either case you can
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