Relative humidity sensor

The humidity sensor FAR017AA is based on a capacitive trans- ducer made up hygroscopic polymers. This material modifies its dielectric constant in function of the water steam in the environment (and so in function of the relative humidity). The transducer is inserted inside an electronic circuit giving an electrical signal proportional to relative humidity.

The transducer is mounted on the top of a support made of plastic material so to minimize heat transfer from the base towards the sensing element.

The sensor body is made of anodized aluminium corrosion resistant. The protection shield is made of polycarbonate added with fibreglass, material with high resistance to ultraviolet radiation and atmospheric corrosion.

The sensor body is inserted inside a natural ventilation shield made of a pile of wedge - shaped plates drilled in the middle (so to have space for sensor housing) and air circulation is guaranteed by thermodynamic characteristics of the structure.

The three plates mounted on the top are not drilled in order to protect the transducer form direct and diffuse solar radiation, atmospheric agents as rain, hail and in general dust or dirt contamination.

At the bottom of the sensor body there is a waterproof connector for power supply and measurement signal. It’s a push pull self latching connector providing security against pull on the cable.

The installation of the sensor requires no particular precautions.

For the calibration of the sensor, a certified instrument is used (reference ACCREDIA). The calibration based on comparison allows to maintain continuity with the metrological chain and assigns a scientific value to the measurement.

Relative humidity sensor