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Leaf and Bud Temperature Sensor -SF 110

Make:  Apogee Instruments      Model: SF-110
✅ Wide Range, Accurate Measurements: Thermistor accuracy is ± 0.1 C across a range of 0 to 70 C, providing accurate measurements at temperatures near zero where frost damage is likely to occur.
✅ Output Options:  Analog and digital output options include an unamplified voltage output or SDI-12 communication protocol.
✅ Typical Applications : Applications include 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.

Leaf and bud temperature approximations measured with an Apogee SF-110 compared to air temperature (top panel) and wind speed (bottom panel) on the evening of April 28, 2012. Leaf and bud temperatures were both below air temperature after 8 P.M. and reached freezing 6 (leaf) and 4 (bud) hours before the air temperature.





General Specification


Weight (Mass)

400 g


570 mm length, 21 mm pipe diameter, 70 mm disk diameter


⦿ 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 (max. assuming continuous input excitation of 2.5 V DC

Measuring Range

⦿ Measurement Range-50 to 70 C
⦿ Measurement Uncertainty: 0.1 C (from 0 to 70 C), 0.2 C (from -25 to 0 C), 0.4 C (from -50 to -25 C) Measurement
⦿ Measurement Repeatability: Less than 0.05 C

Operating Environment

-50 to 70 C; 0 to 100 % relative humidity
Input Voltage Requirement: 2.5 V DC excitation


4 years against defects in materials and workmanship