• Soil temperature and humidity sensor soil transmitter

Soil temperature and humidity sensor soil transmitter

Short Description:

◆ Soil temperature and humidity sensor is a high-precision, high-sensitivity soil moisture and temperature measuring instrument.
◆ The sensor uses the principle of electromagnetic pulse to measure the apparent dielectric constant of the soil, so as to obtain the true moisture content of the soil.
◆ It is fast, accurate, stable and reliable, and is not affected by fertilizers and metal ions in the soil.
◆ Can be widely used in agriculture, forestry, geology, construction and other industries.
◆ Support Custom Parameters.

Product Detail

Product Tags

Technique Parameter

Measurement range soil moisture 0 ~ 100% soil temperature -20 ~ 50 ℃
Soil wet resolution 0.1%
Temperature resolution 0.1 ℃
Soil wet accuracy ± 3%
Temperature accuracy ± 0.5 ℃
Power supply mode DC 5V 
DC 12V 
DC 24V 
Output form Current: 4~20mA 
Voltage: 0~2.5V 
Voltage: 0~5V    
TTL Level: (frequency; Pulse width)
Load resistance Voltage type: RL≥1K
Current type: RL≤250Ω
Working temperature -50 ℃ ~ 80 ℃
Relative humidity 0 to 100%
Product weight 220 g probe with transmitter 570 g
Product power consumption about 420 mW

Calculation Formula

Soil humidity:
Voltage type (0 ~ 5V output):
R = V / 5 × 100%
(R is the soil moisture value and V is the output voltage value (V))
Current type (4 ~ 20mA output):
R = (I-4) / 16 × 100%
(R is the soil moisture value, I is the output current value (mA))

Soil temperature:
Voltage type (0 ~ 5V output):
T = V / 5 × 70-20
(T is the measured temperature value (℃), V is the output voltage value (V), this formula corresponds to the measurement range -20 ~ 50 ℃)
Current type (4 ~ 20mA)
T = (I-4) / 16 × 70 -20
(T is the measured temperature value (℃), I is the output current (mA), this formula corresponds to the measurement range -20 ~ 50 ℃)

Wiring Method          

1. If equipped with a weather station produced by the company, directly connect the sensor to the corresponding interface on the weather station using a sensor line;

2. If the transmitter is purchased separately, the corresponding line sequence of the transmitter is:

Line color Output signal
Voltage Current communication
Red Power + Power + Power +
Black(green) Power ground Power ground Power ground
Yellow Voltage signal Current signal A+/TX
Blue     B-/RX

Transmitter voltage and current output wiring:

Wiring for voltage output mode

Wiring for voltage output mode

Wiring for voltage output mode 1

Wiring for current output mode

Structure Dimensions

Structure Dimensions

Structure Dimensions 1

Sensor Size


1. The serial format
Data bits 8 bits
Stop bit 1 or 2
Check Digit None
Baud rate 9600 Communication interval is at least 1000ms
2. Communication format
[1] Write device address
Send: 00 10 Adress CRC (5 bytes)
Returns: 00 10 CRC (4 bytes)
Note: 1. The address bit of the read and write address command must be 00. 2. Adress is 1 byte and the range is 0-255.
Example: Send 00 10 01 BD C0
Returns 00 10 00 7C
[2] Read device address
Send: 00 20 CRC (4 bytes)
Returns: 00 20 Adress CRC (5 bytes)
Explanation: Adress is 1 byte, the range is 0-255
For example: Send 00 20 00 68
Returns 00 20 01 A9 C0
[3] Read real-time data
Send: Adress 03 00 00 00 02 XX XX
Note: as shown below

Code Function definition Note
Adress Station number (address)  
03 Function code  
00  00 Initial address  
00  02 Read points  
XX XX CRC Check code,front low later high  

Returns: Adress 03 04 XX XX XX XX YY YY

Code Function definition Note
Adress Station number (address)  
03 Function code  
04 Read unit byte  
XX  XX Soil temperature data (high before, low after) Hex
XX  XX Soil humidity data (high before, low after) Hex
YY  YY CRCCheck code  

To calculate the CRC code:
1. The preset 16-bit register is FFFF in hexadecimal (that is, all are 1). Call this register the CRC register.
2. XOR the first 8-bit data with the lower bit of the 16-bit CRC register and put the result in the CRC register.
3. Shift the contents of the register to the right by one bit (toward the low bit), fill the highest bit with 0, and check the lowest bit.
4. If the least significant bit is 0: repeat step 3 (shift again), if the least significant bit is 1: the CRC register is XORed with the polynomial A001 (1010 0000 0000 0001).
5. Repeat steps 3 and 4 until 8 times to the right, so that the entire 8-bit data has been processed.
6. Repeat steps 2 to 5 for the next 8-bit data processing.
7. The CRC register finally obtained is the CRC code.
8. When the CRC result is put into the information frame, the high and low bits are exchanged, and the low bit is first.

Instructions for use

Connect the sensor according to the instructions in the wiring method, then insert the probe pins of the sensor into the soil to measure humidity, and turn on the power and the collector switch to obtain the soil temperature and humidity at the measurement point.


1. Please check whether the packaging is intact and check whether the product model is consistent with the selection.
2. Do not connect with power on, and then power on after checking the wiring.
3. Do not arbitrarily change the components or wires that have been soldered when the product leaves the factory.
4. The sensor is a precision device. Please do not disassemble it by yourself or touch the surface of the sensor with sharp objects or corrosive liquids in order to avoid damaging the product.
5. Please keep the verification certificate and certificate of conformity, and return it with the product when repairing.


1. When the output is detected, the display indicates that the value is 0 or is out of range. Check whether there is obstruction from foreign objects. The collector may not be able to obtain the information correctly due to wiring problems. Please check whether the wiring is correct and firm;
2. If it is not the above reasons, please contact the manufacturer.

Selection Table

No Power supply Output Signal Instructions
LF-0008-     Soil temperature and humidity sensor
5V-   5V power supply
12V-   12V power supply
24V-   24V power supply
YV-   Other power
  V 0-5V
V2 0-2.5V
A1 4-20mA
W1 RS232
W2 RS485
M Pulse
X Other
E.g.:  LF-0008-12V-A1:Soil temperature and humidity sensor 12V power supply, 4-20mA current signal output

  • Previous:
  • Next:

  • Write your message here and send it to us

    Related products

    • Single-point Wall-mounted Gas Alarm (Carbon dioxide)

      Single-point Wall-mounted Gas Alarm (Carbon dio...

      Technical parameter ● Sensor: infrared sensor ● Responding time: ≤40s (conventional type) ● Work pattern: continuous operation, high and low alarm point(could be set) ● Analog interface: 4-20mA signal output [option] ● Digital interface: RS485-bus interface [option] ● Display mode: Graphic LCD ● Alarming mode: Audible alarm -- above 90dB; Light alarm -- High intensity strobes ● Output control: relay o...

    • Portable Multiparameter Transmitter

      Portable Multiparameter Transmitter

      Product advantages 1. One machine is multi-purpose, which can be expanded to use various types of sensors; 2. Plug and play, automatically identify electrodes and parameters, and automatically switch the operation interface; 3. The measurement is accurate, the digital signal replaces the analog signal, and there is no interference; 4. Comfortable operation and ergonomic design; 5. Clear interface and ...

    • Ultrasonic Sludge Interface Meter

      Ultrasonic Sludge Interface Meter

      Features  ● Continuous measurement, low maintenance ● Ultrasonic high frequency technology, stable and reliable performance ● Chinese and English operation interface, easy to operate ● 4~20mA, relay and other interface outputs, system integrated control ● Automatically adjust the transmit power according to the mud layer ● Advanced digital model operation, anti-interference design   ...

    • FXB-01 Metal wind vane wind direction sensor wind vane

      FXB-01 Metal wind vane wind direction sensor wi...

      Customized 3.5-meter-high luminous metal weather vane (customizable stainless steel pole of any height) Product Description The luminous metal weather vane is placed outdoors to indicate the wind direction. The metal structure has fully realized standardized, specialized and standardized production, and the outer surface is treated with hot-dip galvanized and spray...

    • Microcomputer automatic calorimeter

      Microcomputer automatic calorimeter

      One, scope of application Microcomputer automatic calorimeter is suitable for electric power, coal, metallurgy, petrochemical, environmental protection, cement, papermaking, ground can, scientific research institutions and other industrial sectors to measure the calorific value of coal, coke and petroleum and other combustible materials. In line with GB/T213-2008 "Coal thermal determination Method" GB...

    • LF-0010 TBQ Total Radiation Sensor

      LF-0010 TBQ Total Radiation Sensor

      Application This sensor is used to measure the spectral range of 0.3-3μm, solar radiation, can also be used to measure the incident solar radiation to the slant of the reflected radiation can be measured, such as the induction downwardly facing, light shielding ring measurable scattered radiation. Therefore, it can be widely applied to the use of solar energy, meteorology, agriculture, building materi...