LumaSense Technologies INNOVA 1412i - Manual (Page 159)

Chapter 12
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 159 of 202
To calculate the humidity gain factor for a filter (during a
humidity-interference calibration) it is necessary to have a
concentration offset factor for the filter, and vice versa. Note: If
a concentration offset factor is not stored in each of the filter
banks which are active during a zero-point calibration, then it
is necessary to perform a combined zero-point and humidity-
interference calibration task. The set-up of this combined task is
discussed in section 12.11 .
If you only wish to set-up a humidity-interference calibration task the
procedure is as follows:
1. For each installed filter, enter the no. of the filter bank where
you wish the Monitor to store the humidity gain factors which
will be calculated during the humidity-interference calibration
task.
2. Press MEASURE S3 S3 S1 then the following text will be
displayed:
PERFORM ZERO-POINT CALIBRATION ?
NO YES
3. Follow the set-up of a humidity-interference calibration task by
following the black arrows in the schematic diagram shown in
Fig.12.13 .
The following text will appear on the display:
HUM. INTERFERENCE. CONNECT CLEAN, WET AIR
AND PRESS ENTER WHEN READY
12.7.2 Performing a Humidity-interference Calibration
The general equipment necessary to perform a calibration task is
described in section 12.4 and illustrated in Fig.12.5 .
The gas supply required during a humidity-interference calibration is
a supply of clean air containing a constant concentration of water
vapour.
1. Follow the procedure explained in section 12.4 from steps 1 to 3
inclusive and the continue as follows:
2.
a. Connect the outer end of the extra empty flask’s outlet tube
“B” to the Teflon tubing which is connected to attachment
point 3 of the “Y”-piece (see Fig.12.7 ).