Digital psychrometers, FNAD 46 and FNAD 46-3

with integrated atmospheric pressure sensor, for automatic pressure compensation
Designs and specifications see data sheet

Technical data and functions

A digital atmospheric pressure sensor integrated in the ALMEMO® D6 plug itself provides automatic pressure compensation for all pressure-dependent humidity variables.
Humidity calculation 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)
This substantially widens the measuring range and improves the accuracy of humidity variable calculations.
Humidity variable Absolute humidity in g/m³
High-precision NTC sensors for dry temperature and wet temperature
Temperatures are measured using a 24-bit A/D converter incorporated in the ALMEMO® D6 plug.
The humidity variables are calculated from the three primary measuring channels (real measurable variables):
Dry temperature, wet temperature, atmospheric pressure
Freely selectable measurable variables
Four measuring channels are programmed (at our factory):
dry temperature (°C, TT, t), wet temperature (°C, HT, tw),
relative humidity (%H, RH, Uw), atmospheric pressure (mbar, AP, p).