DATA SHEET
Technical changes reserved
0141 0316-600 03.08.2015
Digital humidity sensor HYT939Description
Humidity measurement
Humidity measuring range 2 0 ...100% RH see figure 3
Humidity accuracy 1 ±1,8% RH (0...90% RH)
see figure 1
Hysteresis (50% RH) < ±1% RH
Humidity resolution 0,02% RH
Linearity error < ±1% RH
Response time t63 < 10 sec with metal filter
Tk Residual error (50% RH) 0,05% RH/K (0...60 °C)
Long term drift < 0,5% RH/a
Measuring principle Capacitive polymer humidity sensor
Temperature measurement
Temperature measuring range - 40...+125 °C
Temperature accuracy ±0,2 °C (0...60 °C) see figure 2
Reproducibility ±0,1 K
Response time t63 < 10 sec with metal filter
Temperature resolution 0,015 °C
Long term drift < 0,05 K / a
Measuring principle PTAT (integrated)
Operating data
Operating voltage 2,7…5,5 V
Current consumption
(Nominal)
< 22 μA at 1 Hz measuring rate,
850 μA maximum
Current consumption (Sleep) < 1 μA
Einsatztemperatur -40...125 °C
Application temperature 0...100% RH
Humidity application range I²C, address 0x28 or alternative address
Limits
Operating voltage -0,3…6,0 V
Storage temperature -20...+50 °C
Characteristic features
• Measuring range 0...100% RH, -40…125 °C
• Accuracy ±1.8% RH, Temperature ±0.2 °C
• On request: version that is resistant to pressure up to 16 bar
• Precisely calibrated and temperature compensated
• Chemical resistant, dew formation resistant
• Sealed TO 39 housing with glass grommet and Sinter filter
• Low Hysteresis, compensated Linearity error and Temperature drift
• Operating voltage 2.7…5.5 V
• I²C, address 0x28 or alternative address
• RoHS conformance
• Dimensions 5.2 x 9,0 mm
Application
• Medical systems
• Autoclaves
• Pressure dew point measurement
• Drying systems
• Laboratories
Features
The humidity sensor HYT939 is characterized by its high chemical re-
sistance and thus optimal for extremly sophisticated, industrial appli-
cations.
It measures a wide humidity and temperature range and stays very
stable at high humidity. Further advantages are the excellent humidity
and temperature accuracy and stability.
The sensor is mechanically robust, interchangeable without adjust-
ments and calibrated and temperature compensated.
Connecting to a bus with up to 128 probes is possible.
A pressure-resistant version up to 16 bar is also available.