Air humidityHand-held digital psychrometer FNAD 46 with ALMEMO® D6 plugwith integrated atmospheric pressure sensor, for automatic pressure compensation General features, see chapter ALMEMO® Measuring instruments • 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. Bogel (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 an A/D converter incorporated in the ALMEMO® D6 plug. • The humidity variables are calculated from the three Humidity measuring range 10 to 100 % RH Measuring system psychrometric Accuracy ±1 % RH under nominal conditions Accuracy in measuring range 10... 100 % r.h.: typ. ±1 % r.h. _at 25 °C ±3 K, 1013 mbar_ Nominal conditions +25 °C ±3 K, 1013 mbar, 50 % RH Temperature sensors 2 x NTC type N Ventilator power supply via ALMEMO® D6 plug Housing Plastic Sensor connector Built-in plug ALMEMO® connecting cable coupling, 1.5 meters, PVC cable _with ALMEMO® D6 plug_ 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, • Other humidity variables can also be selected: dewpoint (°C, DT, td), mixture (g/kg, MH, r), absolute humidity (g/m3, AH, dv), vapor pressure (mbar, VP, e), enthalpy (kJ/kg, En, h) This device can be configured directly on a PC using USB adapter cable ZA 1919 AKUV (see chapter „Networking“). Digital atmospheric pressure sensor (integrated in ALMEMO® D6 plug)_ Measuring range 700 to 1100 mbar A/D converter incorporated in ALMEMO® D6 plug _(clamped connection in plug)_ Linearization error-free computing method according to Galway Steinhart (no approximations) Calculated humidity variables Analytic equation Refresh rate 0.4 seconds for all four channels 03/2026 • We reserve the right to make technical changes. Accessories Spare wicks (2 pieces) Hand-held digital psychrometer with NTC sensor Hand-held psychrometer, connecting cable with ALMEMO® D6 plug, integrated digital atmospheric pressure sensor, water bottle, two wicks FNAD46 DAkkS accredited calibration or factory calibration KH91xx, temperature, humidity, for digital sensor, see chapter „Calibration certificates“. DAkkS accredited calibration meets all the requirements regarding test resources laid down in DIN EN ISO/IEC 17025.