LumaSense Technologies INNOVA 1412i - Manual (Page 150)

Chapter 12
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 150 of 202
12.5 General Settings – Stand-alone Use
Before a practical calibration task can be started, the monitor has to
be informed about the kind of calibration task you wish it to perform.
This is done using the push-buttons on the front panel of the
Monitor.
The Calibration Task Set-Up Tree is illustrated in Fig.12.8 . It should
be used to help you follow the path through the different levels of the
calibration set-up. The calibration tasks are set-up while operating in
Measure mode.
Notice the following:
1. Before starting to set-up a calibration task you must make sure
that you choose the correct FILTER BANK NO. to store the
calibration factors which will be calculated during calibration (see
section 12.3.3).
2. If you answer “YES” to PERFORM ZERO-POINT CALIBRATION
?, then ALL the installed optical filters (“A” to “E”) will be zero-
point calibrated, and the concentration offset factor for each
filter will be stored in the filter bank no. which is active for that
filter during the practical calibration task.
3. If you answer “YES” to PERFORM HUM. INTERFERENCE
CALIBRATION ?, then ALL the installed optical filters (“A” to
“E”) will be calibrated for humidity interference, and the humidity
gain factor for each filter will be stored in the filter bank no.
which is active for that filter during the practical calibration task.
4. If you answer “YES” to PERFORM CROSS INTERFERENCE
CALIBRATION ?, then, during the span calibration of each filter,
when each known concentration of span gas is attached to the
Monitor’s air inlet, the signal in the cell is measured using ALL of
the installed optical filters. The factors which describe each gas’s
interference measured on the other installed filters are stored
in the active filter bank of the filter installed to measure this gas.
5. If you answer “YES” to PERFORM GAS SPAN CALIBRATION ?,
then you can choose (1) which of the installed filters you wish to
span calibrate; and (2) whether this calibration should be a single-
point or a two-point span calibration. The concentration
conversion factor calculated during span calibration for a par-
ticular gas using a particular filter), is stored in the filter bank no.
which is active during the calibration procedure.