LumaSense Technologies INNOVA 1412i - Manual (Page 169)

Chapter 12
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 169 of 202
calibrated, but is also measured with all the other installed optical
filters. Note that cross-interference calibration cannot be performed
alone, it has to be performed together with span calibration.
1. For each filter being span calibrated, enter the No. of the filter
bank where you wish the Monitor to store the conversion
factors which will be calculated during the span calibration task.
2. Press MEASURE S3 S3 S1 then the following text will be
displayed:
PERFORM ZERO-POINT CALIBRATION?
NO YES
3.
a. If you only wish to span calibrate filters, follow the set-up of a
span calibration task by following the black arrows in the
schematic diagram shown in Fig.12.16 .
b. If you wish to perform cross-interference calibration as well as
span calibration, follow the set-up of the combined calibration
task by following the black arrows in the schematic diagram
shown in Fig.12.17 .
The following text will appear on the display:
CONNECT
(the name of the gas appears here)
XXXXXXmg/m 3
AND PRESS ENTER WHEN READY
Note: if the gas concentration on the “Analysis Certificate” is given in
ppm then the following formula can be used to convert from parts
per million units (ppm) to mg/m 3 :
For a gas at 20°C and at 1 atmosphere pressure:
Concentration (in mg/m 3 ) = Concentration (in ppm) x Molecular Weight (in g)
24,04
12.9.2 Performing a Span Calibration – Stand-alone Use
The general equipment necessary to perform a calibration task is
described in section 12.4 . Follow the procedure from step 1 to step 3
inclusive and then continue as follows: