Vaisala GMP343 - Manual (Page 42)

User’s Guide ______________________________________________________________________
40 ___________________________________________________________________M210514EN-E
Measurement Range, Data Filtering and
Linearization
Setting the Measurement Range
The measurement range of the GMP343 has been set at factory according
to the order form. However, you can change the measurement range to
optimize measurement performance for a certain concentration level.
To achieve the most accurate 'ppm CO
2
' measurement, the measurement
should be compensated for T, P, %RH, and O
2
concentration in the
environment. The compensation settings are specific to the selected
measurement range, so selecting a suitable measurement range optimizes
the compensation performance. Each range also has its own linearization
function; see section
Linearization on page 45 .
There are 6 measurement ranges available. The range always begins with
zero and only upper end value is changed.
RANGE x
SAVE
x = 1...6
Example:
>range 4
1. SPAN (ppm) : 1000.00
2. SPAN (ppm) : 2000.00
3. SPAN (ppm) : 3000.00
4. SPAN (ppm) : 4000.00
5. SPAN (ppm) : 5000.00
6. SPAN (ppm) : 20000.00
RANGE : 4
>
>save
EEPROM saved successfully.
NOTE RANGE-command only optimizes measurement. The scaling of the
analog output is an independent issue. Normally it is necessary to change
also ALOW and AHIGH values. For more information, see
section
Setting and Testing the Analog Outputs on page 52 .