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SF-421 frost temperature sensor

The SF-421 frost temperature sensor can effectively monitor the frosting of the leaves and buds of orchards and other plants. In general, the temperature of the leaves and buds can be reduced to Below 0 ℃, this is due to the lack of air interference (wind) on the surface of the leaves and buds, which causes the surface of the leaves or buds to be under a negative net long wave radiation (the long wave radiation emitted from the surface absorbs more than the surface), This is called radiation frost. No frost occurs in cloudy or windy weather. The SF-421 frost temperature sensor housing is composed of two high-precision thermistors, one for simulating leaves and one for buds. The temperature of leaves and buds is directly measured to monitor frost events.

Features:
1. Large measuring range and high accuracy; the accuracy is ±0.1℃ in the range of 0~70℃, which can accurately measure the frost occurrence near 0℃;
2. Optional output mode; optional analog voltage output and digital signal output;
3. Widely used in the detection of frost on leaves and buds in crops, orchards, etc.;
SF-421 frost temperature sensor
Technical Parameters
Measuring range
-50~70℃
measurement accuracy
0.1℃(0~70℃)
0.2℃(-25~0℃)
0.4℃(-50~-25℃)
Repeatability
Less than 0.05℃
Long-term drift
(Unstable)
Each year does not exceed 0.02 ℃ (the average temperature is less than 30 ℃, non-condensing environment), long-term high temperature or humid environment will increase drift;
Balance time
10s
Self-heating conditions
Less than 0.01℃
working environment
-50~70℃, 0~100% RH
Preheat time
20 ms
Input voltage
4.5~24V DC
Current consumption
0.6mA (static), 1.3mA (active)
Dimensions
Length 570mm, rod diameter 21mm, round head diameter 70mm
weight
400g
cable
5m twisted pair shielded cable, can be extended in multiples of 5m (waterproof, UV protection, cold resistance)

Origin: United States



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