Vaisala GMP252 - Changing the Filter; Calibration and Adjustment; Figure 31 Opening the Filter

9.2 Changing the Filter
Change the filter to a new one if it shows visible signs of contamination or dirt. When
changing the filter, use clean gloves to avoid blocking the pores of the new filter.
Figure 31 Opening the Filter
When changing the
filter, you can use clean instrument air to gently blow
any loose dirt and
filter material from the sensor. Do not attempt to clean the optical
surfaces in any other manner.
CAUTION!
9.3 Calibration and Adjustment
Calibrate and adjust the CO
2
measurement of the probe as needed. Before starting, read
through this section completely so that you are aware of your options, and the main factors
that aect the result.
Performing an accurate calibration and adjustment takes some time and preparation.
Instead of doing it yourself, you can also have a Vaisala Service Center calibrate and adjust
your probe.
Calibration means comparing the measurement output of the device to a known
reference, such as a known environment in a calibration chamber or the output of a
reference instrument. Correcting the reading of the device so that it measures accurately
is referred to as adjustment.
GMP252 User Guide M211897EN-D
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