Temperature and relative humidity sensor with radiation shield

Temperature and relative humidity sensor with radiation shield

This sensor is designed for measuring air temperature and relative humidity in greenhouses. It is equipped with a solar radiation shield to protect it from direct solar radiation, which would cause inaccurate measurements. Based on the data collected by this sensor, you can calculate the dew point and view the air humidity deficit on MyAgeon platform and, by combining it with the leaf temperature sensor, obtain the VPD.

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This sensor has a radiation shield and should always be used when there is a possibility of direct sunlight hitting the sensor. This is the only sensor capable of eliminating the effects of sensor heating due to direct exposure to sunlight. An innovative, elegant, and simple design makes this possible, as the sensor is positioned inside a tube. The tube is divided into two segments, and the lower one is lined with a reflective material and the upper one with a black material. Each of these two coatings interacts with sunlight in a different way: the reflective coating reflects most of the sunlight, while the black one absorbs most of it. This results in a temperature difference between the two segments of the tube, which drives a passive ventilation flow from the cooler lower part where the sensor is located to the hotter black part and finally to the outside where hot air is expelled.

In experiments comparing normal T/RH sensors with this radiation shield sensor, a difference of up to 7°C (~15°F) can be observed. This highlights the importance of using this sensor over any other.

If you base your decisions on temperature measurements that are off by 7 °C, you could carry out cultivation procedures and techniques that could damage your crop.

If we compare the temperature and RH sensor with convection shield to other products on the market that aim at achieving a similar goal by eliminating the direct effects of sunlight, we can see that it performs better than other passive solutions (helical radiation shield) and is almost equivalent to solutions based on active cooling fans but at a significantly lower cost.

Temperature measurements from -40°C to 60°C (±0.3°C accuracy)

Relative humidity measurements 0%-100%, (±2% accuracy)

Protection class: IP65

Wireless and battery-powered

In order to provide the most accurate measurement, this sensor should be installed in greenhouses in an elevated position and, during the plant’s growth cycle, should be moved upwards keeping the white part of the radiation shield at the height of the plant canopy. In this way, throughout the whole cycle, we can monitor the temperature and relative humidity near the plant canopy, which is the most active part, where the vegetative apex is located and the future floral clusters differentiate.

The radio part that enables transmission is located at the top of the sensor, where you can find a screw-on cap containing the sensor battery.

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Datasheet:

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Ageon S.r.l. – Sede Legale: Via XI Settembre, 37 – 12011 Borgo San Dalmazzo (CN) – Italia – Tel. +39 0171 348114 – Fax +39 0171 348115
P. IVA: 02499330047 – Cod. Fiscale: 01003110291
Ufficio del Registro delle Imprese di Cuneo nr. 01003110291 – REA: CN – 180000 – Capitale sociale: Euro 100.000,00 – Capitale effettivamente versato (da ultimo bilancio): Euro 100.000,00 – Socio Unico: No

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