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Leaf and Bud Temperature Sensor -SF 421

Make:  Apogee Instruments      Model: SF-421
✅ 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..
✅ Output Options: 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.
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The SF-421-SS has an SDI-12 digital output. The detector is a combination of two temperature sensors (precision thermistors) in a single housing. One sensor is designed to mimic a plant leaf the other a flower bud.

The SF-421-SS provides close approximations to leaf and bud temperatures and has a temperature measurement range of -50 to 70°C. Typical 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. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

Utilising the SF-421 Sensor in a custom IoT (Internet of Things)

The SNiP-LBT is a ‘Sensor Node Integrated Package’ for LoRaWAN or CATM-1 communication of real-time leaf and bud temperature measurements, for continuous plant, light and environmental monitoring.

The base SNiP-LBT integrates 1x SF-421 Sensor and 1x S-NODE to a site’s unique network, communication and power requirements.

Make

Apogee Instruments

Model

SF-421

General Specification

:-

Weight (Mass)

400 g

Dimension

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

Outputs

⦿ Input Voltage Requirement: 5.5 to 24 V DC
⦿ Current Draw: 0.6 mA (quiescent), 1.3 mA (active)

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 Repeatability: Less than 0.05 C

Operating Environment

-50 to 70 C; 0 to 100 % relative humidity

Warranty

4 years against defects in materials and workmanship