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USER MANUAL
STM 550 / EMSI
–
ENOCEAN MULTISENSOR FOR IOT APPLICATIONS
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 82/97
11.2
Temperature and humidity sensor
The dedicated temperature and humidity sensor integrated into STM 550 accurately
measures and reports temperature and humidity present at its surface. To achieve the best
possible accuracy, it is important to consider the following points:
◼
Installation height
The sensor should be installed at a height that is representative for the use case. For
the case of an office, the sensor should be mounted at desk level.
◼
Sun light or heat exposure
The sensor should be mounted such that it is not directly exposed to sunlight or heat
(e.g. close to a radiator)
◼
Disturbances
The sensor should be mounted such that the influence from disturbances such as the
air stream from air condition units is minimized. Consider also the possible tempera-
ture gradient between wall and room when mounting the sensor directly onto a wall.
◼
Air flow
The sensor should be mounted such that the airflow from the target measurement
area towards the air inlets is maximized. This will ensure the lowest possible response
time of the sensor. Avoid mounting the sensor in niches or slots with little air flow.
The sensor should be mounted such that the airflow from the target measurement
area towards the air inlets is maximized. This will ensure the lowest possible response
time of the sensor. Avoid mounting the sensor in niches or slots with little air flow.
When designing your own housing around an STM 550 module, consider the location
of the ventilation slots (there are four of them in total) as shown in Figure 61.
Housing design has to maximize the airflow towards these slots focusing especially
on the two slots nearest to the sensor which are marked with a green dot.
Figure 61 below shows the location of the temperature and relative humidity (TRH) sensor
and of the ventilation slots.
Figure 61
–
Location of temperature / humidity sensor and ventilation slots