LumaSense Technologies INNOVA 1412i - Manual (Page 153)

Chapter 12
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 153 of 202
Fig.12.10 Illustration of the calibration data stored in the filter
banks of filters “A” to “E” after a zero-point calibration task
12.6 Zero-point Calibration
To calculate the concentration offset factor for a filter (during a
zero-point calibration) it is necessary to have a humidity gain
factor for the filter, and vice versa. If a humidity gain 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 .
As mentioned in the previous sections, the zero-point calibration task
is not selective. This means that you cannot choose zero-point
calibration of a single filter in the carousel (for example, when a new
optical filter has been installed). When you perform a zero-point
calibration then all the installed filters will be zero-point calibrated.
If it is only a newly-installed optical filter which needs to be
calibrated, then the same procedure used for an individual filter must
be used, see section 12.5.1 . In this way you can protect your original
concentration offset factors.