Rae MultiRAE PLUS PGM-50, Руководство по эксплуатации и обслуживанию

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OPERATION OF ACCESSORIES
3 - 7
3.5 Dilution Fitting
An optional dilution fitting can be installed together with the
remote sampling probe or Tygon tubing on the gas inlet port
to dilute the gas samples. This fitting is needed if the gas
sample does not contain more than 10% oxygen. This is due
to the fact that the combustible sensor will not function
correctly when the oxygen concentration falls below 10%.
The dilution fitting will increase the oxygen concentration
so that the combustible sensor can still be used under
oxygen deficient conditions. The other use of the dilution
fitting is to measure the combustible, VOC or toxic gas
when the concentration exceeds the upper limit of the
sensor range.
See the dilution fitting instructions for proper installation.
Make sure to set the dilution ratio in the programming mode
(see Section 4.8) so that the correct gas reading will be
displayed when the dilution fitting is used.
WARNING: For this application, the user must have
the monitor or dilution air inlet located in a clean
atmosphere outside the confined space and use a
remote access probe or Tygon tubing to sample the
gas under test.