Output method of soil temperature sensor

1. Introduction of soil moisture sensor

Soil moisture sensor is also known as: soil moisture sensor, soil moisture sensor, soil moisture sensor. Mainly used to measure soil volume water content, do soil moisture monitoring and agricultural irrigation and forestry protection. The commonly used soil moisture sensors are FDR type and TDR type, namely frequency domain type and time domain type. FDR (Frequency Domain Reflectometry) frequency domain reflectometry is currently more popular. It is an instrument for measuring soil moisture. It uses the principle of electromagnetic pulse to measure the apparent dielectric constant (ε) of the soil according to the frequency of electromagnetic wave propagation in the medium. ) to obtain the soil volumetric water content (θv). FDR has the advantages of simplicity and safety, fast and accurate, continuous fixed point, automation, wide range, and less calibration. It is a recommended soil moisture measuring instrument.

2. Output method of soil temperature sensor

Distinguish according to the type of electrical signal output. Some of the older analog output models of soil moisture sensors on the market are still on sale in the market, and their output methods are basically divided into two types.

1. Voltage output model: usually use 0.1 to 10V output, and use two to three wire data lines as the output method.

2. Current output model: Current output model is a relatively common and simple way, most of which use two-wire output.

Distinguish according to the interface type. Of course, due to the need for sensors in some industries to exchange data with terminal devices in some characteristic forms, several interface methods have appeared before and after.

1. RS485 serial port type;

2. RS232 serial output;

3. Universal network cable interface output;

4. USB output mode;