Basic Info.
Appliance
Food Analysis, Medical Research, Biochemistry
Certification
RoHS, FCC, CE
Product Name
Water Quality Conductivity Sensor
Transport Package
Standard
Product Description
Water quality sensor conductivity sensor transmitter water quality detection
RK-3001-EC
1. Product Introduction
1.1 Introduction
The conductivity/hardness online analyzer is one of the intelligent online chemical analysis instruments. It is widely used in the EC value or TDS value and water temperature in solutions such as thermal power, chemical fertilizers, metallurgy, environmental protection, pharmaceuticals, biochemistry, food and tap water. Continuous monitoring. This product is equipped with a waterproof housing to convert the signal of the aqueous solution into a standard 485/4-20mA/0-10V signal through digital setting and analysis. The product does not need to be calibrated in one molding process and can be used immediately.
Parameters:Parameter | Parameter content |
DC power supply | 12-24V DC |
Power consumption | ≤0.15W(@12V DC , 25ºC) |
Measurement accuracy | 3%F.s |
Output signal | 485/4-20mA/0-10V |
Water temperature range | -10ºC-80ºC(Manual / Auto) |
Water temperature accuracy | 0.1ºC |
responding speed | ≤15s |
Probe parameters:Electrode model | RK-K001 | RK-K010 | RK-K100 | RK-K1000 |
K value | K=0.01 | K=0.1 | K=1 | K=10 |
range | 0-20us/cm | 0-200us/cm | 0-2000us/cm | 0-20000us/cm |
Resolution | 0.001us/cm | 0.001us/cm | 0.01us/cm | 0.1us/cm |
Application occasions | Pure water detection | Drinking water testing | Tap water, river water | Sewage testing |
Electrode material | stainless steel | stainless steel | stainless steel | Polysulfone |
Installation thread | 1/2 thread | 1/2 thread | 1/2 thread | 3/4 thread |
Probe cable length | 5 meters (default) |
1.2 System framework diagram
1.2.1 485 interface frame diagram
This sensor can be connected and used alone. First, use a 12V DC power supply. The device can be directly connected to a PLC with 485 interface, and it can be connected to a single-chip microcomputer through a 485 interface chip.The single-chip microcomputer and PLC can be programmed through the modbus protocol specified later to cooperate with the sensor.At the same time, use USB to 485 to connect to the computer, and use the sensor configuration tool provided by our company for configuration and testing.
This product can also be used by combining multiple sensors on a single 485 bus. Please follow the "485 bus field wiring rules" (see appendix) when performing 485 bus combination.In theory, one bus can connect more than 16 485 sensors. If you need to connect more 485 sensors, you can use 485 repeaters to expand more 485 devices,The other end is connected to a PLC with a 485 interface, connected to a single-chip microcomputer through a 485 interface chip, or connected to a computer using USB to 485, and configured and tested using the sensor configuration tool provided by our company.
1.2.2 Frame diagram of analog interface
The analog interface can be directly connected to the PLC data module, or the signal can be processed by the single-chip microcomputer, as shown in the figure below:
2 Hardware Connection
2.1 Inspection before equipment installation
Please check the equipment list before installing the equipment:name | Quantity |
High-precision sensor | 1 set |
12V waterproof power supply | 1 set (optional) |
Warranty card/certificate | 1 serving |
2.2 Interface description
The power interface can be a wide voltage power input of 12-24V. The product pays attention to the positive and negative of the signal line, and do not reverse the positive and negative of the signal line.
Wiring mode of 485 interface sensor: | Thread color | Description |
power supply | brown | Power supply positive (12-24VDC) |
black | Power negative |
Communication | Yellow (gray) color | 485-A |
blue | 485-B |
Analog interface sensor wiring mode: | Thread color | Description |
power supply | brown | Power supply positive (12-24VDC) |
black | Power negative |
Communication | Yellow (gray) color | Voltage/current output positive |
blue | Voltage/current output negative |
The factory default provides 5 meters long wire, customers can extend the wire as needed or wire in order.
2.3 Installation instructions
This meter is wall-mounted. Please install it on the wall and try to avoid wind, rain and direct sunlight.In order to prevent the water temperature inside the instrument from rising, please install it in a well-ventilated place.When installing the instrument, please do not tilt it left or right, try to install it horizontally.
The electrode is a very precise component, and the correct installation method must be used. The wrong installation method will cause the electrode to be damaged or irreversibly damaged.Electrode adopts pipeline installation. Immersion type. Flange installation is all possible.
Please do not put the electrode directly into the water, you should choose the electrode mounting bracket or the flow cup to fix it.Before installation, be sure to use raw material tape (3/4 thread) to do a waterproof seal to prevent water from entering the electrode and causing short circuit of the electrode cable.
During the water cut, make sure that the electrode is immersed in the test liquid or wear a protective cap with a built-in protective liquid. In winter, if the water temperature is low for a long time, the antifreeze device should be added or the room should be returned to add water for storage.Otherwise, the service life will be shortened.
3. 485 interface communication protocol
3.1 Basic communication parametersparameter | content |
coding | 8-bit binary |
Data bit | 8-bit |
Parity bit | no |
Stop bit | 1 person |
Wrong calibration | CRC lengthy cyclic code |
Baud rate | 2400bps/4800bps/9600 bps can be set, the factory default is 9600bps |
coding | 8-bit binary |
3.2 Data frame format definition
Adopt Modbus-RTU communication protocol, the format is as follows:
Initial structure >= 4 bytes of time
Address code = 1 byte
Function code = 1 byte
Data area = N bytes
Error check = 16-bit CRC code
End structure >= 4 bytes time
Address code: the address of the transmitter, which is unique in the communication network (factory default 0x01).
Function code: The command function prompt sent by the host, this transmitter only uses the function code 0x03 (read memory data).
Data area: The data area is the specific query data area, pay attention to the 16bits data high byte first.
CRC code: two-byte check code.
Interrogation frame:address code | function code | Register start address | Register length | Check code low bit | High bit of check code |
1 byte | 1 byte | 2 byte | 2 byte | 1 byte | 1 byte |
Reply frame:address code | function code | Number of valid bytes | Data area | Second data area | Nth data area |
1 byte | 1 byte | 1 byte | 2 byte | 2 byte | 2 byte |
3.3 Register addressRegister address | PLC configuration address | content | operating |
0001H | 40002 | Water temperature (unit: 0.1ºC) | Read only |
0002H | 40003 | Conductivity (high byte) (unit refer to the probe selection table) | Read only |
0003H | 40004 | Conductivity (low byte) (unit refer to the probe selection table) | Read only |
0100H | 40101 | Device address (0-252) | Read and write |
0101H | 40102 | Baud rate (2400/4800/9600) | Read and write |
3.4 Communication protocol example and explanation
3.4.1 Read the conductivity value of device address 0x01
Interrogation frame:address code | function code | initial address | Data length | Check code low bit | High bit of check code |
0x01 | 0x03 | 0x00,0x02 | 0x00,0x02 | 0x65 | 0xCB |
Response frame (e.g. read conductivity value of 1.89 conductivity)address code | function code | Number of valid bytes | Conductivity value | Check code low bit | High bit of check code |
0x01 | 0x03 | 0x04 | 0x00 0x00 0x00 0xBD | 0x78 | 0x35 |
Conductivity (take the probe with K=1 as an example, the resolution is 0.01us/cm):
00BD H(Hexadecimal)=189=>Conductivity=1.89 us/cm
3.4.2 Read the water temperature value of the device address 0x01
Interrogation frame:address code | function code | initial address | Data length | Check code low bit | High bit of check code |
0x01 | 0x03 | 0x00,0x01 | 0x00,0x01 | 0xd5 | 0xca |
Reply frame:address code | function code | Number of valid bytes | Water temperature value | Check code low bit | High bit of check code |
0x01 | 0x03 | 0x02 | 0x00 0xAF | 0xDB | 0xBF |
Water temperature:
00AF H(hexadecimal)=175=>water temperature=17.5ºC
3.4.3 Read device address 0x01 water temperature, conductivity concentration value
Interrogation frame:address code | function code | initial address | Data length | Check code low bit | High bit of check code |
0x01 | 0x03 | 0x00,0x01 | 0x00,0x03 | 0xA4 | 0x0B |
Reply frame:address code | function code | Number of valid bytes | Water temperature value | Conductivity value | Check code low bit | High bit of check code |
0x01 | 0x03 | 0x06 | 0x01 0x1b | 0x00 0x00 0x00 0x28 | 0xDB | 0xBF |
Water temperature:
011B H(hexadecimal)=283=>water temperature=28.3ºC
Conductivity (take the probe with K=1 as an example, the resolution is 0.01us/cm):
0028 H(Hexadecimal)=40=>Conductivity=0.4 us/cm
4. Analog Wiring Instructions
The analog sensor wiring is simple, just connect the wire to the designated port of the device. The device supports 3/4 wire connection.
4.1 Typical four-wire wiring method
The following figure shows the wiring method of current sensor. Connect the power cord (brown wire and black wire) of the sensor to the power source;The yellow (gray) color line of the sensor is the signal positive when the signal is connected to the acquisition device, and the current flow is from the sensor to the acquisition device;The blue line of the sensor is the negative signal when the signal is connected to the current acquisition device, and the current flow is from the acquisition device to the sensor.
The following figure shows the wiring method of voltage type sensor. Connect the power cord (brown wire and black wire) of the sensor to the power supply;The yellow (gray) wire of the sensor is the signal positive of the signal being connected to the acquisition device, and the voltage of the yellow (gray) wire is the output voltage;The blue line of the sensor is the negative signal when the signal is connected to the voltage acquisition device. The voltage of the blue line is the reference voltage, which is 0V consistent with the voltage of the black line.
4.2 Typical three-wire wiring method
For typical three-wire wiring, compared to four-wire wiring, the blue wire can be omitted. In the sensor, the blue wire and the black wire are short-circuited in the sensor, so the blue wire can be omitted.
For the three-wire current connection method, after connecting the power cord (brown wire and black wire) of the sensor to the power supply, only the yellow (gray) wire of the sensor is connected to the signal positive of the current acquisition device.
For the three-wire voltage connection mode, after connecting the sensor's power cord (brown wire and black wire) to the power supply, only the yellow (gray) wire of the sensor is connected to the signal positive of the voltage acquisition device.
5. Meaning and Conversion of Analog Parameters
5.1 Analog 4-20mA current outputCurrent value | Conductivity |
4mA | 0 |
20mA | full range |
The calculation formula is P(conductivity)=(I(current)-4mA)*full scale/16mA
The unit of I is mA. 4mA represents 0 point, and 20mA represents the maximum range linear conversion.
5.2 Analog 0-10V voltage outputVoltage value | Conductivity |
0V | 0 |
10V | full range |
The calculation formula is P (conductivity) = V (voltage) * full scale/5000mV
The unit of V is mV. Please use 0V to represent 0 points and 10V to represent the maximum range linear conversion.
5.3 Analog 0-5V voltage outputVoltage value | Conductivity |
0V | 0 |
5V | full range |
The calculation formula is P (conductivity) = V (voltage) * full scale/10000mV
The unit of V is mV. Please use 0V to represent 0 points and 10V to represent the maximum range linear conversion.
Address:
No. 9 Dadong Rd, Jinan, Shandong, China
Business Type:
Manufacturer/Factory
Business Range:
Consumer Electronics, Electrical & Electronics, Health & Medicine, Industrial Equipment & Components, Instruments & Meters
Management System Certification:
ISO 9001, ISO 9000, ISO 14001, ISO 14000, ISO 20000, OHSAS/ OHSMS 18001, IATF16949, HSE, ISO 14064, QC 080000, GMP, BSCI, ANSI/ESD
Company Introduction:
Jinan Rainbow Technology is a high-tech enterprise with MEMS sensor and New energy as its core. It was established in Jinan, Shandong, China and has an R&D center in New York, USA.
Our products will play a critical role in the transition to a clean energy and green economy, it can be widely used in many fields such as Hydrogen Fuel cell, medical devices, air purification, gas detector, lithium battery safety monitoring, Hydrogen leak detection, smart home, and security IoT to meet the needs of safety, health, and energy conservation.
Through continuous technological innovation, we powering the Clean Energy transition, and provide our customers with more competitive materials. We have core capabilities in design, manufacturing and testing to provide customers with high precision and highly reliable products and One-Stop Solutions.
Our company has core invention patents and has passed ISO9001 quality system certification. Our products comply with RoHS and REACH environmental protection standards.
With the goal of standing at the forefront of technology, we are committed to promoting the development of Hydrogen energy with the spirit of "protecting homes with core technology and innovating to change lives".