Sensirion SHT41 Handleiding
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www.sensirion.com Version - April 1/6 1 2022
Application Note
Using the Integrated Heater of SHT4x in High-Humidity
Environments
Abstract
Polymer-based capacitive humidity sensors are best suited for operation at intermediate humidity levels. When
exposed to high humidity environments (~>90%RH) for extended exposure times they develop a reversible,
positive humidity offset. In the following, this offset is called Creep. It occurs when water molecules continuously
soak the polymer without escaping from itOriginal accuracy specifications are restored by itself through .
exposing the sensor to regular humidity and temperature conditions again. This process takes longer the re mo
water impregnated into the polymerThis document outlines how integrated on-chip heater can be is . SHT4x’s
used to mitigate creep and take highly accurate measurements. Two different approaches to creep-free
operation are discussed: Continuous and single-shot measurement. In both cases, the thermal energy provided
by the integrated heater removes excess water from the sensing polymer. In the continuous case the heater is
activated periodically while for the single-shot, it is turned on only in case measurement is . Finally, best a due
practices for this application are summarized.
Contents
1 Introduction Creep Definition –................................................................................................................. 2
2 Creep Mitigation ......................................................................................................................................... 2
3 Continuous Creep Mitigation .................................................................................................................... 3
4 Single-Shot Creep Mitigation .................................................................................................................... 4
5 Creep Mitigation in Analog Sensors ......................................................................................................... 4
6 Further Information .................................................................................................................................... 4
7 Revision History ......................................................................................................................................... 4
8 Bibliography ............................................................................................................................................... 5
Product specificaties
| Merk: | Sensirion |
| Categorie: | sensor |
| Model: | SHT41 |
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