Data Sheet
HYGROCHIP
1/3
DIGITAL HUMIDITY SENSOR
HYT-221
All mechanical dimensions are valid at 25°C ambient temperature, if not differently indicated. All data except the mechanical dimensions only have information purposes and are not to be
understood as assured characteristics. Technical changes without previous announcement as well as mistakes reserve. The information on this data sheet was examined carefully and will be
accepted as correct; No liability in case of mistakes. Load with extreme values during a longer period can affect the reliability.
Released 09/2011 Rights reserved for change in
technical data!
Characteristic features
Measuring range 0 … 100 % rH, -40 … 125 °C
Accuracy ±1.8% rH, Temperature ±0.2 °C
Splash water proof with protection filter
Waterproof membrane filter
Precisely calibrated and temperature com-
pensated
Chemical resistant, dew formation resistant
Mechanically robust
Low Hysteresis, compensated Linearity error
SIL-connections, plug-in type, RM 1.27mm
I
2
C, address 0x28 or alternative address
Dimensions 15.3 x 10.2 x 5.3 mm
RoHS conformance
Typical areas of 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 fitted
into housing openings and can be sealed against
the wall with the use of O-ring. In combination with
the waterproof membrane filter, 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 accu-
racy of ±1.8 % rH and ±0.2 °C. Like all representa-
tives of the HYGROCHIP family, the sensor com-
bines 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 I
2
C 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 result-
ing 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 field of drying systems.
Further variants and the full spectrum of
HYGROCHIP product series can be found at:
http://www.ist-ag.com