DATA SHEET
Digital humidity sensor HYT-221
DescriptionDescription
Characteristic features
• Measuring range 0 … 100 % RH, -40…125 °C
• Accuracy ±1.8 % RH, Temperature ±0.2 °C
• Waterproof membrane lter
• Precisely calibrated and temperature compensated
• Chemical resistant, dew formation resistant
• Mechanically robust
• Low Hysteresis, compensated Linearity error
• SIL-connections, plug-in type, RM 1.27 mm
• I²C, address 0x28 or alternative address
• Dimensions 15.3 x 10.2 x 5.3 mm
• RoHS conformance
Humidity measurement
Humidity measuring range
Humidity accuracy
Reproducibility
Hysteresis < ±1 % RH
Humidity resolution 0,02 % RH
Linearity error < ±1 % RH
Response time t
Tk Residual error 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 K (0...60 °C) see gure
Reproducibility ±0,1 K
Response time t
Temperature resolution 0,015 °C
Long term drift < 0,05 K / a
Measuring principle PTA (integrated)
2
63
63
3
1
0...100 % RH - see gure
±1,8 % RH (10...80 % RH)
see gure
±0.2 % RH
< 12 sec
< 12 sec
1
3
2
Application
• Meteorology
• Industrial drying systems
• Medical devices
• Aviation
• Extreme sports
Features
The HYT 221 – for critical application areas.
The round stainless steel casing can be easily tted into housing openings and can be sealed against the wall with the use of O-ring. In com-
bination with the waterproof membrane lter, it results into an assembly
that is splash water proof and enables a sealed housing construction
while providing a high dynamic responsiveness.
Precisely calibrated, the HYT 221 delivers an accuracy of ±1.8 % RH
and ±0.2 °C. Like all representatives of the HYGROCHIP family, the
sensor combines the advantages of a precise, capacitive polymer
humidity sensor with the high integration density and functionality of
an ASIC. The signal processing integrated in the sensor completely
processes the measured data and directly delivers the physical parameters of relative humidity and temperature over the I²C compatible
interface as digital values. The module is precisely calibrated by the
manufacturer and is therefore fully inter-changeable without adjustment. Both the linearity error as well as temperature drift are corrected
“OnChip” through computation resulting in an outstanding accuracy
over a wide range of application. Due to mechanical robustness, high
chemical stability,dew formation resistance as well as an excellent long
term stability, the typical areas of application are humidity measurement
in the sauna, applications in outdoor areas or industrial applications in
the eld of drying systems.
Technical changes reserved
0141 0316-81 03/2014
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 831650 | info@bb-sensors.com | bb-sensors.com
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DATA SHEET
Digital humidity sensor HYT-221
Relative humidity accuracy
1
The accuracy is tested at 23 °C and 3.3 V operating voltage in the
direction of rising humidity. The accuracy does not include Tk-Residual
error, residual linearity error or Hysteresis effect.
measured in the same direction and does not consider the Hysteresis
3
effect,.
The maximum dew point is brought down to 80 °C.
2
The repeatability is
Temperature measurement accuracy
Further information about the component can be found at:
Operating data
Operating voltage 2,7…5,5 V
Current consumption
(Nominal)
Current consumption (Sleep) < 1 µA
Application temperature -40...125 °C
Humidity application range 0...100 % RH
Digital interface I²C, address 0x28 or
Limits
Operating voltage -0,3…6,0 V
Storage temperature -50...150 °C
< 22 µA at 1 Hz measuring rate
850 µA maximum
alternative address
Mechanical dimensions
Humidity application range
Technical changes reserved
0141 0316-81 03/2014
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 831650 | info@bb-sensors.com | bb-sensors.com
2 / 2
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