User's Guide ______________________________________________________________________
64 __________________________________________________________________ M010056EN-G
You can now calibrate or check the humidity and temperature or the
analog outputs according to the instructions given in this chapter.
If the current measurement is needed in a hazardous area, the
multimeter is connected to the terminals A1/A2 (+) and B1/B2 (-). Use
only an approved multimeter.
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:
WARNING
The power supply connectors (C1 and C2)
MUST NOT
be used in
hazardous areas. For calibration and adjustment in a hazardous area
use only an approved multimeter, which fulfills the safety factors
printed on the protective cover.
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
=
=
