Item Type: Soil NPK PH Sensor Probe_x000D_Material: 304 stainless steel, plastic_x000D_Weight: Approx. 348g/0.77lb_x000D_Waterproof Grade: IP68_x000D_Size: Approx. 133x60x45mm/5.24x2.36x1.77in_x000D_Cable: Approx. 5m/16.40ft_x000D_Built in Sensors: Soil temperature, soil humidity, NPK, conductivity_x000D_Type: RS485 (For Modbus)_x000D_Power Supply Voltage: DC 9-30V_x000D_Load Capacity: Current output impedance 250_x000D_Voltage Output Impedance 1K_x000D_Measuring Range:_x000D_Soil Moisture: 0-60% (volume moisture content)_x000D_Soil Temperature: -40-80_x000D_Conductivity: 0-20000us/cm_x000D_NPK: 0-2000 mg/kg_x000D__x000D_Accuracy:_x000D_Soil Moisture: 3% (0-35% measurement range)_x000D_5% (35%-60% measurement range)_x000D_Soil Temperature: 0.5_x000D_Conductivity: 5%_x000D_NPK: 2%FS_x000D__x000D_Resolution:_x000D_Soil Moisture: 0.1%_x000D_Soil Temperature: 0.1_x000D_Conductivity: 1us/cm_x000D_NPK: 1mg/kg_x000D__x000D_Working Environment: Soil temperature -40 ~ 80 ; soil humidity 60%_x000D_Protection Class: IP68_x000D_Probe Material: 304 stainless steel, plastic, anti corrosion aluminum zinc alloy electrode_x000D_Scope of Application:Scientific experiments, water saving irrigation, greenhouses, flowers and vegetables, grass pastures, soil quick measurement, plant cultivation, sewage treatment, grain storage and measurement of moisture content and temperature of various particles._x000D__x000D_Wiring Method:_x000D_Default Line Sequence:_x000D_Line Color and Output Signal_x000D_Red: Voltage and Current: Power positive, RS485: Power positive_x000D_Black: A+_x000D_Yellow: B-_x000D_Green: Voltage and Current: Power negative, RS485: Power negative_x000D__x000D_Description of Sensor Communication Protocol:_x000D_If you are connecting multiple sensors to PLC, configuring or connecting to a programmable data collector, it is recommended to use the standard for ModBus-RTU protocol (hex sending and receiving)._x000D_Standard for ModBus-RTU communication protocol_x000D_1. Serial Port Format_x000D_8 data bits, 1 stop bit, no parity bit, baud rate 9600bps, the serial port debugging software is set to hex sending and receiving, the interval between two communications is at least 1000ms, the CRC in the manual is the parity bit, 2 words Festival._x000D_2. Register Address_x000D_The YGC-SM comprehensive soil sensor can integrate up to 8 soil elements, namely soil temperature, soil moisture, electrical conductivity, and soil nitrogen, phosphorus and potassium content. Each element has its own register address._x000D_The correspondence between register addresses and channels in for MODBUS is as follows:_x000D_Register Address and Aisle Data Shows: _x000D_0x0000: Channel 1 (TW) Signed number (-40~80), 0x7FFF (invalid/missed)_x000D_0x01 0x2C=30.0_x000D_0x0001: Channel 2 (soil wet) Signed number (0~60%), 0x7FFF (invalid/missed)_x000D_0x01 0x23=29.1_x000D_0x0002: Channel 3 (conductivity) Signed number (0-20000) us/cm, 0x7FFF (invalid/missed)_x000D_0x01 0xF4=500us/cm_x000D__x000D_0x0005: Channel 6 (nitrogen content) Signed number (0-2000) mg/kg, 0x7FFF (invalid/missed) 0x00 0xE1=225 mg/kg_x000D_0x0006: Channel 7 (phosphorus content) Signed number (0-2000) mg/kg, 0x7FFF (invalid/missed) 0x00 0x64=100 mg/kg_x000D_0x0007: Channel 8 (potassium content) Signed number (0-2000) mg/kg, 0x7FFF (invalid/missed) 0x00 0xA0=160 mg/kg_x000D__x000D_Troubleshooting :_x000D_The display value of the instrument is incorrect when the analog signal or RS485 is output. Correct data may not be acquired due to wiring problems or communication serial port failures. Please check whether the wiring is correct and firm, whether the serial port is occupied, and whether the serial port settings are correct; 1Corrosion Resistant: Adopts stainless steel probe with non electrolytic isolation design, ensuring no electrolysis and enhanced resistance to salt alkali corrosion. 2Fine Workmanship: Resin casting at the probe interface for better water and corrosion resistance, with vacuum sealing using epoxy resin for improved sealing performance. 3High Performance: Plug and play with quick response time, allowing for instant display of data within seconds of inserting the sensor into the soil. 4Water Resistant: IP68 waterproof and corrosion resistant, can be used for extended dynamic monitoring either buried in soil or directly immersed in water. 5Long Lasting: Long term burying in soil is possible, resistant to electrolysis and corrosion due to complete vacuum sealing, providing high accuracy and fast response.1 x_x000D__x000D_SoilNPKPHSensorProbe