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Radiation Frost Detector Support

Specifications
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Radiation Frost Detector Specifications
Specifications Icon
  SF-110 SF-421
Measurement Range -50 to 70 C -50 to 70 C
Measurement Uncertainty 0.1 C (from 0 to 70 C), 0.2 C (from -25 to 0 C), 0.4 (from -50 to -25 C) 0.1 C (from 0 to 70 C), 0.2 C (from -25 to 0 C), 0.4 (from -50 to -25 C)
Measurement Repeatability Less than 0.05 C Less than 0.05 C
Long-term Drift (Non-stability) Less than 0.02 C per year (when used in non-condensing environments where the annual average temperature is less than 30 C, continuously high temperatures or continuously humid environments increase drift rate) Less than 0.02 C per year (when used in non-condensing environments where the annual average temperature is less than 30 C, continuously high temperatures or continuously humid environments increase drift rate)
Equilibration Time 10 s 10 s
Self-heating Less than 0.01 C (typical, assuming pulsed excitation of 2.5 V DC), 0.08 C at 5 C (maximum, assuming continuous input excitation of 2.5 V DC) Less than 0.01 C
Operating Environment -50 to 70 C; 0 to 100 % relative humidity -50 to 70 C; 0 to 100 % relative humidity
Input Voltage Requirement 2.5 V DC excitation 5.5 to 24 V DC
Output Voltage Range 2.5 V DC -
Current Draw 0.1 mA DC (per thermistor) at 70 C (maximum, assuming continuous input excitation of 2.5 V DC) 1.56 mA (quiescent), 1.93 mA (active)
Dimensions 17.5 cm length, 2.2 cm pipe diameter, 6.0 cm disk diameter 17.5 cm length, 2.2 cm pipe diameter, 6.0 cm disk diameter
Mass 75 g 75 g

 

Radiation Frost Detector Videos
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Lecture 6-Radiation Frost

Lecture 7-Energy Balance Principles at Night

Making a Durable Wire Splice

 

Radiation Frost Detector Case Studies
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About Radiation Frost Detector

Frost damage to plants can have large impacts on crop yield and quality. Protection of crops during frost events is dependent on the accuracy of plant temperature predictions. Often, air temperature is not a reliable predictor of timing, duration, and severity of frost events because plant canopy temperatures can be significantly different than air temperature under certain environmental conditions.

On clear, calm nights, plant leaf temperatures can drop below freezing even if air temperature remains 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.

Apogee Instruments radiation frost detectors are designed to approximate plant leaf temperatures for prediction of frost events. Radiation frost detectors are intended for applications in cropped fields and orchards when air temperatures will be near freezing, and where air temperature measurements are not a good predictor of frost formation.

Apogee Instruments radiation frost detectors consist of one precision thermistor, which simulates a leaf. Radiation frost detectors provide close approximations to leaf temperatures and can be used for prediction of frost on leaves. Detectors are weatherproof and are designed for continuous temperature measurement in the same environmental conditions plants are exposed to.

Typical Applications

Applications include leaf temperature estimates in cropped fields, orchards, and vineyards. These leaf temperatures can then be used to alert growers of the potential for frost damage to crops.

Artificial Frost Formation on Tea
Artificial Frost Formation on Tea
Apogee Instruments' SF-110-SS radiation frost detector assist researchers developing an artificial radiation frost chamber to study frost formation on tea plants.
Read More >
PDF >
Fruit Grower Network of Radiation Frost Monitoring
Fruit Grower Network of Radiation Frost Monitoring
Apogee Instruments' SF-110-SS radiation frost detector assist orchardists to monitor radiation frost events.
Read More >
PDF >

If you would like to share your application of this product, please click here

 

Radiation Frost Detector Product Manuals
Product Manuals Icon

Radiation Frost Detector Analog Manual (SF-110) >      Radiation Frost Detector SDI-12 Manual (SF-421) >

 

Radiation Frost Detector Specification Sheets
Specification Sheets Icon

Radiation Frost Detector Spec Sheet (SF-110 & SF-421) >

 

Radiation Frost Detector Technical Drawings
Technical Drawings Icon

Radiation Frost Detector Tech Drawing (SF-110 & SF-421) >

 

  Helpful Articles and Links

   Fruit Bud Damage from Cold Temperatures

   Responding to Freezing Conditions

   Frost/Freeze Protection for Horticultural Crops

   Minimize Losses from Frost Using Direct Measurements - Campbell Scientific Post

Radiation Frost Detector Journal Articles

   Using Wireless Sensor Networks in Commerical Strawberry Production

 

 FAQs
For FAQs Click Here

 

Radiation Frost Detector Software & Datalogger Programs
Specification Sheets Icon
Sample Datalogger Programs

Programs are in .CR1X format and can be downloaded for use with Campbell Scientific dataloggers. Right click and select "Save target as..." or an equivalent command in your browser. They can also be viewed using Wordpad or other text viewers.

Note: In 2020 the CR1000 Campbell Scientific datalogger was discontinued. Click here to access the discontinued .CR1 format sample datalogger programs >

Radiation Frost Detector - Analog >
Radiation Frost Detector - SDI-12 >

 

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Logan, UT 84321
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  • products
    • PAR, Daily Light Integral, and Photoperiod Meters
    • Pyranometers
    • Quantum (PAR & ePAR) Sensors / Meters
    • Infrared Radiometers
    • Aspirated Radiation Shield
    • Spectroradiometers
    • Net Radiometer
    • Pyrgeometers
    • Humidity Probes
    • Temperature Sensors
    • Radiation Frost Detector
    • Oxygen Sensors
    • UV Sensors
    • Chlorophyll Concentration
    • Barometric Pressure
    • PAR Meters for Aquariums
    • microCache Bluetooth Micro Logger
    • Red - Far-red and PAR-FAR Sensors
    • Photometric Sensor
    • NDVI Sensors
    • Solar Energy PV Monitoring
    • Accessories
    • Calibration Services
    • Replacement Cables
    • Refurbished Products
  • About Us
    • Contact Us
    • ISO 9001:2015 Certification
    • International Distributors
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    • Newsletters
    • Company History
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