SENSIRION SHT Series Design Manual

Design Guide for Humidity and Temperature Sensors
A comment on how to properly design-in an SHTxx or STSxx.
SHTxx are humidity and temperature sensors of highest quality with a broad range of different features. To
take full advantage of their outstanding performance, several housing and PCB design rules need to be
considered. This document aims to provide help during the design-in phase of your product and fosters a
deeper understanding of the sensor's functionality. Please note that unbeneficial housing and/or PCB designs
may cause significant temperature and humidity deviations as well as an increased response times.
Most important Design-In Recommendations
Figure 1. A small dead volume allows for rapid
adaption to changes in the environment.
Figure 3. A large opening in the housing provides
improved air exchange and thus enhanced access
to the environment.
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Figure 2. Separating a sensor compartment from
the remaining housing minimizes the influence of
entrapped air on the sensor.
Figure 4. Decoupling of the sensor from heat
sources on the PCB minimizes the influence of
internal heating on the sensor.
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