6. D6 temperature / humidity sensor FHAD46
The FHAD46 comprises a fully adjusted digital capacitive sensor which can be exchanged
at any time without any loss in accuracy. For automatic pressure compensation, an air
pressure sensor is installed. The humidity quantities are calculated from the real measur-
able variables - temperature, relative humidity, atmospheric pressure - on the basis of for-
mulae as per Dr. Sonntag and the enhancement factor as per W. Bögel (correction factor
´fw(t,p)´ for real mixed gas systems). The measuring range and accuracy of this system
are thus much greater than with earlier sensors. The measured atmospheric pressure can
also be used in the ALMEMO
®
measuring instrument as reference atmospheric pressure.
6.1 Measuring ranges preset at our factory
Description
Range
Exp. Measuring range Units Resolution
1. Temperature T, t
B-01
DIGI
-2
-20..+80.00
+
°C
0.01 K
2. Relative humidity RH, Uw
B-02
DIGI
-1
5... 98.0 %H
0.1 % rH
3. Dew point DT, td
B-03
DIGI
-1
°C
0.1 K
4. Atm. press. AP, p (optional)
B-08
DIGI
-1
300...1100.0 mb
0.1 mb
+
The measuring range depends on the sensor type. (see data sheet)
The new D6 humidity ranges (see 7.2.1) can be partly configured on the device itself;
for this purpose the appropriate ALMEMO
®
standard ranges ´H DT´, ´H AH´, H VP´,
´H En´ must have been programmed accordingly. ´DIGI´ will replace these ranges auto-
matically with the new ones.
Please note that new ranges ´D dv´ or ´D p´ may be lost in this process.
They can then only be restored via the PC.
6.2 Configuration on a PC via the sensor menu
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