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Leaf and Bud Temperature Sensor Support

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Leaf and Bud Temperature Sensor 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 0 to 2.5 V DC (assuming input excitation of 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) 0.6 mA (quiescent), 1.3 mA (active)
Dimensions 570 mm length, 21 mm pipe diameter, 70 mm disk diameter 570 mm length, 21 mm pipe diameter, 70 mm disk diameter
Mass 400 g 400 g

 

Leaf and Bud Temperature Sensor Videos
Videos Icon

Lecture 6-Radiation Frost

Lecture 7-Energy Balance Principles at Night

Making a Durable Wire Splice

 

Leaf and Bud Temperature Sensor Case Studies
Case Studies Icon
About Leaf and Bud Temperature Sensors

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 and flower bud temperatures can drop below freezing even if air temperature remains above 0 C (see figure on following page). 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 Leaf and Bud Temperature Sensors are designed to approximate plant leaf and flower bud 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 leaf and bud temperature sensors consist of two precision thermistors, one combined with a simulated leaf and the other a simulated bud, in a single housing. The leaf sensor is designed to mimic a plant leaf and the bud sensor is designed to mimic a flower bud. Leaf and bud temperature sensors provide close approximations to leaf and bud temperatures and can be used for prediction of frost on leaves and buds. Detectors are weatherproof and are designed for continuous temperature measurement in the same environmental conditions plants are exposed to.

Typical Applications

Leaf and bud temperature estimates in cropped fields, orchards, and vineyards. Leaf and bud temperatures returned by the detector can then be used to alert growers to the potential of frost damage to crops.

Fruit Grower Network of Radiation Frost Monitoring
Fruit Grower Network of Radiation Frost Monitoring
Apogee Instruments' SF-110-SS Leaf and Bud Temperature sensors assist orchardists to monitor radiation frost events.
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Leaf and Bud Temperature Sensor Product Manuals
Product Manuals Icon

Leaf and Bud Analog Manual (SF-110) >      Leaf and Bud SDI-12 Manual (SF-421) >

 

Leaf and Bud Temperature Sensor Specification Sheets
Specification Sheets Icon

Leaf and Bud Spec Sheet (SF-110 & SF-421) >

 

Leaf and Bud Temperature Sensor Technical Drawings
Technical Drawings Icon

Leaf and Bud 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

Leaf and Bud Temperature Sensor Journal Articles

   Using Wireless Sensor Networks in Commerical Strawberry Production

 

 FAQs
For FAQs Click Here

 

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SF-110 Radiation Frost Detector
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SF-110-SS: Leaf and Bud Temperature Sensor

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About Apogee Instruments, Inc.

Address:
721 West 1800 North
Logan, UT 84321
United States of America

Hours: Monday-Friday 8 AM- 5 PM MST

Main Line / Order Status: (435) 792-4700
or sales@apogeeinstruments.com

Technical Sales and Support: (435) 245-8012
or techsupport@apogeeinstruments.com

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  • products
    • Pyranometers
    • Quantum (PAR) Sensors / Meters
    • Daily Light Integral Measurement
    • Infrared Radiometers
    • Aspirated Radiation Shield
    • Spectroradiometers
    • Net Radiometer
    • Pyrgeometers
    • Humidity Probes
    • Temperature Sensors
    • Leaf and Bud Temperature Sensor
    • Oxygen Sensors
    • UV Sensors
    • Chlorophyll Concentration
    • Barometric Pressure
    • PAR Meters for Aquariums
    • microCache Bluetooth Micro Logger
    • Red - Far-red and PAR-FAR Sensors
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    • Solar Energy PV Monitoring
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