Apogee Radiation Frost Detector

A sensor designed to mimic a plant leaf and bud for radiation frost detection

The Raditaion Frost Detector is a combination of two temperature sensors (precision thermistors) in a single housing. One sensor is designed to mimic a plant leaf and the other a flower bud. The SF-110 provides close approximations to leaf and bud temperatures and may be used for prediction of frost on leaves and buds.

On clear, calm nights, leaf and bud temperature can drop below freezing even if air temperature remains slightly above 0 °C. This is called a radiation frost and is due to the lack of air mixing (wind) near the surface, and a negative net longwave radiation balance at the surface (more longwave radiation is being emitted from the surface than what the surface is absorbing from the clear sky). Under cloudy and/or windy conditions, radiation frost events do not occur.

The temperature measurement range of the sensor is -40 to +70 °C with an accuracy of ± 0.1 °C from 0 to +70 °C. However, the sensor is intended for applications in cropped fields and orchards when temperatures will be near freezing, and where air temperature measurements are not a good predictor of frost formation.

 

Models:

SF-110: Radiation Frost Detector, output 2 x bridge measurement (requires 2.5VDC excitation)

SF-410: Radiation Frost Detector, output SDI-12

 

Application Link:

Campbell Scientific Blog: Minimise Losses From Frost Using Direct Measurements


About the manufacturer

Apogee manufacture a specialised range of sensors for biophysical studies including light sensors, oxygen and surface temperature (IR) sensors.

All Apogee products are covered by an industry-leading four-year warranty against failure due to defects in materials and workmanship.

 

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Radiation frost detector specifications


File Size 832KB   Filename radiation-frost-detector-specs.pdf   Download