Features1Corrosion 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.SpecificationItem Type: Soil NPK PH Sensor ProbeMaterial: 304 stainless steel, plasticWeight: Approx. 348g/0.77lbWaterproof Grade: IP68Size: Approx. 133x60x45mm/5.24x2.36x1.77inCable: Approx. 5m/16.40ftBuilt in Sensors: Soil temperature, soil humidity, NPK, conductivityType: RS485 (For Modbus)Power Supply Voltage: DC 9-30VLoad Capacity: Current output impedance 250Voltage Output Impedance 1KMeasuring Range:Soil Moisture: 0-60% (volume moisture content)Soil Temperature: -40-80Conductivity: 0-20000us/cmNPK: 0-2000 mg/kgAccuracy:Soil Moisture: 3% (0-35% measurement range)5% (35%-60% measurement range)Soil Temperature: 0.5Conductivity: 5%NPK: 2%FSResolution:Soil Moisture: 0.1%Soil Temperature: 0.1Conductivity: 1us/cmNPK: 1mg/kgWorking Environment: Soil temperature -40 ~ 80 ; soil humidity 60%Protection Class: IP68Probe Material: 304 stainless steel, plastic, anti corrosion aluminum zinc alloy electrodeScope 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.Wiring Method:Default Line Sequence:Line Color and Output SignalRed: Voltage and Current: Power positive, RS485: Power positiveBlack: A+Yellow: B-Green: Voltage and Current: Power negative, RS485: Power negativeDescription of Sensor Communication Protocol: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).Standard for ModBus-RTU communication protocol1. Serial Port Format8 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.2. Register AddressThe 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.The correspondence between register addresses and channels in for MODBUS is as follows:Register Address and Aisle Data Shows: 0x0000: Channel 1 (TW) Signed number (-40~80), 0x7FFF (invalid/missed)0x01 0x2C=30.00x0001: Channel 2 (soil wet) Signed number (0~60%), 0x7FFF (invalid/missed)0x01 0x23=29.10x0002: Channel 3 (conductivity) Signed number (0-20000) us/cm, 0x7FFF (invalid/missed)0x01 0xF4=500us/cm0x0005: Channel 6 (nitrogen content) Signed number (0-2000) mg/kg, 0x7FFF (invalid/missed) 0x00 0xE1=225 mg/kg0x0006: Channel 7 (phosphorus content) Signed number (0-2000) mg/kg, 0x7FFF (invalid/missed) 0x00 0x64=100 mg/kg0x0007: Channel 8 (potassium content) Signed number (0-2000) mg/kg, 0x7FFF (invalid/missed) 0x00 0xA0=160 mg/kgTroubleshooting :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;Package List1 xSoil NPK PH Sensor Probe