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SARAD GmbH
18
Supplementary equipment
According to the needs of the customer the Smart Radon Sensor can be equipped with additional
sensors for example: pressure or CO2 sensor.
Pressure sensor
The barometric pressure can be measured in a range from 800mbar to 1200mbar. The sensor unit is
fully calibrated and features temperature compensation.
CO
gas sensor
2
The integrated CO2 sensor uses the non-dispersive infrared (NDIR) operational principle. This
requires an infrared source which cannot be supplied by the internal batteries due to the increased
power consumption. Therefore CO2 sensor works only if external power supply is present.
Continuous operation
The automatic calibration procedure of the sensor uses the CO2 concentration of fresh air (400ppm)
as reference. The instrument must be exposed to this "fresh air concentration" at least once during
the last 24 hours. This can be achieved by short ventilation of the room. If there are no persons
inside a room for a while (for example overnight), the concentration goes back to 400ppm.
Attention! If the reference concentration cannot be reached within the past 24 hours, the sensor
interprets the lowest measured result as 400ppm. This results in a systematically increasing
measurement error.
If the CO2 concentration exceeds the recommended threshold of 1000ppm, the yellow LED turns on.
It will turn off as soon as the concentration drops below 1000ppm.
Occasional operation
If the CO
sensor is used for sampling periods less than 24 hours no calibration procedure as
2
described above is carried out. Therefore it is recommended to operate the sensor at least once per
week for a period longer than 24 hours to force a calibration. Of course, the instrument must be
exposed to the fresh air concentration of 400ppm during that time.
Manual_Smart-Radon-Sensor_EN_12-03-2020.docx
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