11. D6 Psychrometer FNAD46-3
Digital sensor FNAD46-3 uses high-precision NTC sensors with an accuracy level of
0.1 K; these can be exchanged without any loss in accuracy. Temperatures are ac-
quired using an integrated 24-bit A/D converter. For the purpose of automatic atmo-
spheric pressure compensation an atmospheric pressure sensor is integrated as stan-
dard. The humidity quantities are calculated from the primary channels, i.e. real mea-
surable variables - dry temperature, humid temperature, atmospheric pressure - on the
basis of formulae 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 ac-
curacy 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 ref-
erence atmospheric pressure.
11.1 Measuring ranges preset at our factory
Description
Range
Exp Meas. range
Units Resolution
1. Dry temperature TT, t
B-01
DIGI
-2
0..+90.00 °C
0.01 K
2. Humid temperatur HT, t
w
B-09
DIGI
-2
0..+90.00 °C
0.01 K
3. Rel. humidity RH, U
w
mit LK
B-02
DIGI
-1
10... 100.0 %H
0.1 % rH
4. Atm. pressure AP, p
B-08
DIGI
-1
300...1100.0 mb
0.1 mb
11.2 Configuration on a PC via the sensor menu
- 23 -
