REINHARDT
System- und Messelectronic GmbH
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MWS_55_e.indb Page 17
geändert am 04.12.2020 von DO
Manual MWS 55 / MWS 88 / MWS 10 and Sensors 55
3.4 The sensors
3.4.1 The Temperature Sensor
Temperature measurement is based on a precision precalibrated sensor SHT25 from Sensirion.
The values are read internally via a I²C bus. The resulting measured value is additionally linea-
rised by the weather station.
By standard, the tem per ature sensor is mounted on the lower side of the weather station. A white
lacquered pagoda protects against radiation and prevents a buildup of heat.
Range: from -40 °C to + 60 °C, measuring accuracy ± 0.3 °C, (display also possible in Kelvin or
°Fah ren heit)
CAUTION: Compared to temperature measurements in big shielded cabins the measured values
can be higher when the sun is shining. If the temperature measurements must correlate with the
measurements in big shielded cabins you should measure temperature in the shadow or measure
with an additional temperature sensor placed in the shadow or in a big shielded cabin!
Unit: [°C]
3.4.2 The Humidity Sensor
is also based on a precision precalibrated sensor SHT25 from Sensirion. The values are read in-
ternally via a I²C bus. The resulting measured value is additionally linearised and compensated
by the weather station. The sensor is also mount ed on the lower side of the weather station. A
Gore-Tex cover protects it from pollution or destruction by dust or insects.
The humidity sensor can be used in a tem perature range be tween -40 °C to + 60 °C. It is linearized
to an accuracy of 2 %.
Range: from 10 to 100 %, measuring accuracy ±2 %, display also as dewpoint meas ure ment in
°C or °F
NOTE
This sensor is very responsive to static charge and air pollution (dust, aggressive gases, but also salt).
Please note that under unfavourable conditions (i.e. microbic stress caused by moulds, bacteria)
this sensor ages faster than under normal conditions.
Also see:
Unit: [%]
3.4.3 The Pressure Sensor
is a precalibrated digital sensor from Bosch (BMP180/BMP280) which is read internally via a I²C
bus. This sensor already is linearized to 4 hPa for the whole temperature range, the barometer is
temperature compensated. Another temperature linearisation reduces the deviation to less than
2 hPa over the whole temperature range.
The sensor can be used in the temperature range of -40 °C to + 60 °C.
Measuring range: from 300 hPa to 1100 hPa with ± 0.8 hPa accuracy. Display can be reduced to
0 m above sea level (input of the local altitude in [m], display also in mm mercury column or Inch
mercury column).
An additional output of barometric pressure (reduced to sea level) is possible. 3 different formulas
are predefined within the weather station (simple formula, international barometric formula and
barometric formula of DWD considering temperature and humidity).
Further formulas you may use within the weather32 software.
This sensor can be transported by air cargo!
Unit: [hPa]
