HYT 271/939/939p/221
Digital Humidity and Temperature Module
Optimal for general purpose humidity applications
with best accuracy at 0 - 50 °C and 0 - 90 % RH
Benefits & Characteristics
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Fast response time (HYT 271)
Low hysteresis
Low drift
Stable at high humidity
Custom specific versions
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Humidity and temperature sensor with excellent accuracy
Easy integration, interchangeable without adjustments
I
2
C protocol
Fully calibrated and temperature compensated
The HYT humidity module family
HYT 271
The fastest and smallest of the HYT family is the 271.
The digital module with only 10.2 x 5.1 x 1.8 mm size
offers a wide application window and an optimal price-
performance-ratio. It is only the best solution for fast
measurements or sophisticated mass applications.
HYT 221
The round stainless-steel casing can be easily fitted into
housing openings and sealed against a wall with the
use of an O-Ring. The hydrophobic/oleophobic PTFE
membrane filter protects the sensor from dust and
liquids while providing a high dynamic responsiveness.
HYT 939/939p
The strongest of the HYT modules in TO39 packaging
particularly features mechanical robustness. Through
glass to metal seals and welding of the stainless-steel
cap onto the metal header, it is pressure tight up to 16
bar in the 939p version.
Custom specific versions:
If a higher accuracy or different sensor design is needed, the modular design of HYT allows for high flexibility –
the sensor, its calibration and assembly can easily be adapted to develop tailor-made modules fulfilling individual
demands. Customized IST AG humidity modules feature extraordinary response times, high accuracies in condensing
environment or low humidity conditions. Please contact us for custom specific versions.
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Technical Data
Humdity
Accuracy:
Reproducibility:
Resolution:
Response time t
631
:
Long-term drift:
±1.8 % RH at +23 °C (0 % RH to 90 % RH)
±0.2 % RH
0.03 % RH
271
<4s
221
< 10 s
939
< 10 s
939p
< 10 s
Temperature
±0.2 °C (0 °C to +60 °C)
±0.1 °C
0.015 °C
271
<5s
221
< 10 s
939
< 10 s
939p
< 10 s
< 0.5 % RH (at 23 °C and 30 % RH to 70 %
RH in synthetic air)
Exposure to VOCs can lead to higher values. Please find
more details in HYT application note.
< 0.05 °C/a
Measurement principle:
Capacitive polymer humidity sensor
PTAT (integrated)
Hysteresis:
Operating voltage:
Current consumption (nominal):
Current consumption (sleep):
Digital interface:
Operating voltage (limits):
Measuring range
2
:
Operating range
3
:
Storage conditions:
< ±1 % RH at 25 °C
2.7 V to 5.5 V
< 22 µA at 1 Hz measuring rate; 850 µA max.
< 1 µA
I
2
C, address 0x28 or alternative address
-0.3 V to 6 V
0 °C to 50 °C, 0 % RH to 90 % RH
For usage in condensing environment please refer to HYT application note.
-40 to 125 °C, 0 to 100 % RH
Non-condensing. For usage in condensing environment please refer to HYT application note.
-5 to 30 °C, < 30 % RH
Please refer to HYT application note for packaging recommendations.
1)
The response time is often measured for increasing humidity steps, whereas physics predicts that decreasing humidity leads to
generally far longer response times for capacitive humidity sensors. IST always measures response times for decreasing humidity
values, since this is the worst case.
In the specified range the modules measure within typical tolerance ±1.8 % RH, see Fig. 1. At T > 50 °C and/or high humidity
over a long period of time, an offset in the % RH signal can occur. Please refer to HYT application note for reconditioning
procedure.
Specifies the range the modules work without permanent damage. % RH/T tolerances etc. cannot be guaranteed in these
conditions.
2)
3)
Fig. 1: Typical tolerance of the % RH measurement
Fig. 2: Typical tolerance of the temperature measurement
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HYT 271
Mechanical Dimensions
Pin Assignement
1
SDA
2
GND
3
VDD
4
SCL
HYT 221
Mechanical Dimensions
Pin Assignement
1
SDA
2
GND
3
VCC
4
SCL
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HYT 939/939p
Mechanical Dimensions
Pin Assignement
bottom view
1
SCL
2
VCC
3
GND
4
SDA
HYT 939p
Pressure tight
< 16 bar
Order information
Version
Order code
Former order code
HYT 271
153349
150.00066
HYT 221
103923
150.00068
HYT 939
153656
150.00067
HYT 939p
153658
150.00096
Additional Documents
Document name
Application Note
Please find software code examples on www.ist-ag.com.
AHHYTM_E
Innovative Sensor Technology IST AG, Stegrütistrasse 14, 9642 Ebnat-Kappel, Switzerland
Phone: +41 71 992 01 00 | Fax: +41 71 992 01 99 | Email: info@ist-ag.com | www.ist-ag.com
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 reserved • 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 • The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner • Typing errors and mistakes reserved • Product
specifications are subject to change without notice • All rights reserved
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