Vaisala HMT360Series Guía de usuario Pagina 66

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User’s Guide ______________________________________________________________________
64 ___________________________________________________________________ M010056EN-J
Calculating Correspondence of Current Values
and Output Quantities
When using HMT360 without a display, calibration and adjustment is
carried out by using a multimeter. Use the following equations to calculate
the current values corresponding to the reference output quantities.
0605-015
Example 1:
Relative humidity scaling 0 ... 100 %RH, reference 11.3 %RH:
0605-016
Example 2:
Temperature scaling -40 ... +120 °C, reference 22.3 °C:
0605-017
where
Q
ref
= Reference value of the calibrated quantity
Q
min
= Reference value of the calibrated quantity
Q
max
= Value corresponding to 20 mA
I 4 mA 16 mA
Q
ref
Q
min
Q
max
Q
min
-----------------------------
+=
I 4 mA 16 mA
11.3 %RH 0 %RH
100 %RH 0 %RH
-------------------------------------------------
+ 5.808 mA==
I 4 mA 16 mA
22.3° C40° C
120° C40° C
--------------------------------------
+ 10.230 mA==
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