Based on our rich experience in developing capacitive level sensor, we release the series of  capacitive soil humidity sensors as industrial class standard.  The soil sensor is corrosion resistant and long-term using, no worrying of corrosion. The soil sensor can supports analog of 0-3V or 0-5V and RS485 MODBUS-RTU, and the capacitive soil sensors have been developed for 4 versions.  The first version and second version of the soil sensor has been stopped.  The third version(classic version) have been released to marker for mass quantity application. After several years, the latest version has been developed and manufactured.

Capacitive Soil Moisture Sensor

(Latest Version)

Comparing with previous version(classic version) , the new capacitive soil moisture sensor has built-in MCU which completely achieves the wave filtering of original data. Meanwhile, D/A analog signal output is adopted that can ensure more stable performance and better linearity result.

The previous version has been proved its performance, comparing with the latest version, the class version has 5.0V power supply and supports analog voltage output and RS485 Modbus-RTU. Of course, its consistency is not so good like the latest version, but the classic version still has been good enough for regular application,meanwhile it is high cost-effective. Thus, users can make a comprehensive consideration to select proper version as actual requirement.

The 2 version almost have the same appearance, but the built-in parts are much more different. The latest version has 6 chips, and the classic version has 3 chips.

Features of New Version

  • Wide power supply(1.8-5.2V),NOT easily affected by power quality
  • Signal output is linearity, other similar soil sensor can't make it
  • Built-in MCU and low temperature drift operational amplifier have smart wave filtering algorithm
  • Corrosion resistance, high hardness and good stability and consistency
  • Crystal coating process for probe sensing area

2 kinds of Working Mode:

1).Analog Voltage Output for Single Soil Moisture

  • Wide power supply:(1.8-5.2V)
  • Normal working current: 16.5mA (Humdity: 0 or 100%)
  • Working peak current: 40mA (Humidity: 30%)
  • Humidity measurement range: 0-100%(mass moisture content)
  • Accuracy: +/-5%
  • Response time:<500mS
  • Protection class: IP67(Can be immersed in water)
  • Working temperature:-20℃ - +85℃(Industrial class)
  • Analog voltage output: 0.02-3.30V for 0-100% moisture (direct proportion). More details about the direction proportion:  If 0.02V for 0, 3.30V for 100% moisture. If output value is 1.65V, the moisture value is 50%（linearity calculation).

2).RS485 MODBUS-RTU Output for Soil Temperature Mositure

Please feel free to contact for related protocol.

Capacitive Soil Humidity Sensor

(Classic Version)

                                     

The class version has been well sold in the past years and  have been the main selling item of the series proudct. It is made with compression type plastic enclosure, doesn't contain metal screws and prevent rusting. Crystal coating treatment is done in sensitive area, anti-corrosion, waterproof and scratch resistant, and the hardness can reach 8h.
2 kinds of Working Mode:

1).Analog Voltage Output for Single Soil Moisture

  • Wide power supply: 5V
  • Working peak current: 22mA
  • Humidity measurement range: 0-100%
  • Accuracy: +/-5%
  • Response time:<500mS
  • Protection class: IP67(Can be immersed in water)
  • Working temperature:-20℃ - +65℃
  • Communication: RS485 MODBUS-RTU
  • Analog voltage output: 0-5V or 0-3V. More details: For 0-5V, actual value is 0.8-4.8V;  for 0-3V, actual value is 0.3-3.0V.

2).RS485 MODBUS-RTU Output for Soil Temperature Mositure

By Modbus-rtu, the soil temperature value and soil mosture value can be readout.

Please feel free to contact for related protocol.

Installing