Product Description:
Introducing our versatile and reliable soil testing equipment, suitable for various soil qualities and applications. This product is designed to measure soil moisture, temperature, pH, and conductivity parameters for soil moisture monitoring, scientific experiments, precision agriculture, water-saving irrigation, greenhouses, plant cultivation, grass pastures, sewage treatment, and more.
Features:
- Low threshold and fast response time with no need for reagents or limitations on the number of detections.
- Specially treated alloy electrode materials that are durable and resistant to external shocks and corrosion.
- Completely sealed and resistant to acid and alkali corrosion, allowing for long-term dynamic detection by burying it in soil or directly putting it into water.
- High precision and fast response with good interchangeability and a probe insertion design to ensure accurate measurement and reliable performance.
- Can also be used for conductivity measurements of water, fertilizer-integrated solution, nutrient solutions, and substrates.
Connect the NPK Sensor's Yellow and Blue wires to USB's A and B terminals RS485.
Connect the Brown and Black wires from the NPK Sensor to the + and - terminals on the Barrel Connector.
Now power the sensor and connect the USB RS485 to the Windows 10 PC.
Please check your device manager to ensure which COM port is detected.
Download CAS
MODBUS SCANNER and add a device (
https://store.chipkin.com/products/tools/cas-modbus-scanner)
Use Baud Rate: 4800
Device ID: 1
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1.3 Main parameters
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DC power supply (default)
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DC 4.5-30V
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Maximum power consumption
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0.5W (24V DC power supply)
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Operating temperature
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-20℃~+60℃
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Core chip temperature resistance
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85°C
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stable schedule
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≤5min
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Conductivity parameters
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Range
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0-20000us/cm
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resolution
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1us/cm
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Typical Accuracy
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±3%FS in the range of 0-10000us/cm; ±5%FS in the range of 10000-20000us/cm;
(brown soil, 60%, 25℃ )
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Soil moisture parameters
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Range
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0-100%
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resolution
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0.1%
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precision
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±2% within 0-50%, @ (brown soil, 30 %, 25℃)
±3% within 50-100%, @ (brown soil, 60%, 25℃)
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Soil Temperature Parameters
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Range
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-40~80℃
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resolution
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Resolution: 0.1°C
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precision
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±0.5°C (25°C)
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Soil pH parameters
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Range
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3~9PH
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resolution
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0.1
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NPK parameters
(Input after measurement by the national standard method instrument)
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Range
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0-2999mg /kg(mg/L)
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resolution
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1 mg/kg (mg/L)
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Typical Accuracy
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≤5% (subject to the actual measuring instrument)
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Conductivity temperature compensation
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Built-in temperature compensation sensor, compensation range 0-50°C
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degree of protection
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IP68
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Pin material
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Anti-corrosion special electrode
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Sealing material
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Black Flame Retardant Epoxy
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Default Cable Length
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2 meters, cable length can be customized
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Dimensions
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45*15*123mm
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output signal
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RS485 (Modbus protocol)
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Note: The performance data stated above are obtained under the test conditions using our test system and software. In order to continuously improve products, our company reserves the right to change design features and specifications without prior notice.
Shell size
Equipment Dimensions (Unit: mm)
1.4 System frame diagram
This product can also be used with multiple sensors combined in one 485 bus . In theory, one bus can have 254 485 sensors, and the other end can be connected to a PLC with a 485 interface , connected to a single-chip microcomputer through a 485 interface chip, or use a USB to 485 . Connect with the computer , use the sensor configuration tool provided by our company to configure and test ( only one device can be connected when using the configuration software) .
1.5 Product selection
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PR-
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company code
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3002-
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TR-
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Soil Testing Housing
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NPKPH-
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NPKPH
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TH NPK PH -
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Temperature Moisture NPK PH
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ECNPKPH-
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Conductivity NPK PH
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ECTHNPKPH-
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Conductivity Temperature Moisture Nitrogen Phosphorus Potassium PH
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N01
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RS485 (Modbus-RTU protocol)
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Chapter 2 Hardware Connection
2.1 Inspection before equipment installation
Equipment List:
■Equipment 1
■Certificate of Conformity
■USB to 485 (optional)
2.2 Interface description
Wide voltage power supply input 4.5~30V can be used. When wiring the 485 signal line, pay attention that the A/B lines cannot be reversed, and the addresses of multiple devices on the bus cannot conflict.
2.2.1 Sensor wiring
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thread color
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illustrate
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Remark
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brown
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Power positive
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4.5~30V DC
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black
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power ground
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GND
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yellow
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485-A
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485-A
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blue
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485-B
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485-B
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Chapter 3 How to Use
Since the electrode directly measures the conductivity of the soluble salt ions in the soil, the soluble ions in the soil must be higher than about 20% when the soil volume moisture content can correctly reflect the conductivity of the soil. In the long-term observation, the measured value after irrigation or rainfall is closer to the true level. If you want to measure quickly, you can water the measured soil first, and measure after the water is fully infiltrated.
If you are measuring on a hard surface, you should drill a hole first (the diameter of the hole should be smaller than the diameter of the probe), then insert it into the soil and compact the soil before measuring; the transmitter should prevent severe vibration and impact, let alone knock it with hard objects. hit. Since the transmitter is packaged in black, the temperature of the transmitter will rise sharply (up to 50°C) under strong sunlight. Pay attention to sunshade and protection when using.
3.1 Quick test method
Select a suitable measurement location, avoid stones, ensure that the steel needle will not touch hard objects, throw away the surface soil according to the required measurement depth, keep the original tightness of the soil below, hold the sensor vertically and insert it into the soil. Do not shake from side to side during the operation. It is recommended to take multiple measurements within a small range of a measuring point to obtain the average value.
3.2 Buried measurement method
Dig a pit with a diameter > 20cm vertically, insert the steel needle of the transmitter horizontally into the pit wall at a predetermined depth, and fill the pit tightly. Record.
3.3 Precautions _
1. When measuring, the steel needle must be fully inserted into the soil.
2. Avoid strong sunlight directly irradiating the transmitter and causing the temperature to be too high. Pay attention to lightning protection when using in the field.
3. Do not bend the steel needle violently, do not pull the transmitter lead-out force, and do not beat or hit the transmitter violently.
4. The protection level of the transmitter is IP68, and the transmitter can be completely soaked in water.
5. Due to the presence of radio frequency electromagnetic radiation in the air, it is not advisable to be in the energized state for a long time in the air.
No. Chapter 4 Configuration Software Installation and Use
Our company provides supporting "485 parameter configuration software" , which can easily use the computer to read the parameters of the sensor, and at the same time flexibly modify the device ID and address of the sensor.
Note that when using software to automatically acquire, it is necessary to ensure that there is only one sensor on the 485 bus.
4.1 Connect the sensor to the computer
After the sensor is correctly connected to the computer via USB to 485 and provides power, you can see the correct COM port on the computer (check the COM port in "My Computer-Properties-Device Manager-Port").
Open the data package, select "debugging software" --- "485 parameter configuration software", find and open it.
If the COM port is not found in the device manager, it means that you have not installed the USB to 485 driver (included in the data package) or have not installed the driver correctly, please contact the technical staff for help.
4.2 Use of sensor monitoring software
①. The configuration interface is as shown in the figure. First, obtain the serial port number and select the correct serial port according to the method in Chapter 3.1 .
②. Click the test baud rate of the software, and the software will test the baud rate and address of the current device. The default baud rate is 4800bit/s, and the default address is 0x01.
③. Modify the address and baud rate according to the needs of use, and at the same time query the current function status of the device.
④. If the test is unsuccessful, please recheck the device wiring and 485 driver installation.
Chapter 5 Communication Protocol
5.1 Communication Basic Parameters
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make up code
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8 -bit binary
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data bit
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8 bits
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parity bit
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none
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stop bit
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1 bit
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error checking
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CRC (Redundant Cyclic Code)
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baud rate
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2400bit/s , 4800bit/s , 9600bit/s can be set, the factory default is 4800bit /s
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5.2 Data frame format definition
Adopt Modbus-RTU communication protocol, the format is as follows:
Time for initial structure ≥ 4 bytes
Address code = 1 byte
Function code = 1 byte
Data area = N bytes
Error checking = 16-bit CRC code
end structure ≥ 4 bytes
Address code: It is the address of the transmitter, which is unique in the communication network (factory default 0x01).
Function code: This product uses function codes 0x03, 0x06, 0x10, etc.
Data area: The data area is the specific communication data, pay attention to the high byte of 16bits data first!
CRC code: two-byte check code.
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