Owner's Manual for Daviteq models including: MBRTU-SAL Salinity Sensor Modbus RTU Output, MBRTU-SAL, Salinity Sensor Modbus RTU Output, Sensor Modbus RTU Output, Modbus RTU Output, RTU Output, Output
JUL-2021 MBRTU-SAL is a salinity sensor based on electrodeless inductive measurement. It uses the generator to generate an alternating magnetic field in the primary coil to generate an induced current in the medium.
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DocumentDocumentSALINITY SENSOR WITH MODBUS RTU OUTPUT MBRTU-SAL USER GUIDE SALINITY SENSOR WITH MODBUS RTU OUTPUT MBRTU-SAL USER GUIDE SALINITY SENSOR WITH MODBUS RTU OUTPUT MBRTU-SAL This document is applied for the following products JUL-2021 1. Introduction MBRTU-SAL is a salinity sensor based on electrodeless inductive measurement. It uses the generator to generate an alternating magnetic field in the primary coil to generate an induced current in the medium. The intensity of the induced current depends on the concentration of ions in the medium. The induced current creates another magnetic field in the secondary coil. The receiver measures the induced current on the coil to determine the salinity of the medium. At the same time, the built-in temperature sensor can automatically compensate the temperature, which is suitable for online long-term monitoring of the environment. Application scope: Marine, industrial waste water, pharmaceutical, biotechnology, industrial manufacturing and other online whole process monitoring. Features 1. Digital sensor, direct output RS-485 digital signal, support Modbus / RTU 2. The built-in temperature sensor can automatically compensate the temperature 3. There is no electrode, so there is no polarization reaction 4. The measurement and the medium are completely electrically isolated, which can be used for high-precision measurement of heavy and easily precipitated medium or solution with low cost of use and maintenance 5. Low power consumption and anti-interference design of internal circuit 2. Specification Item Output Measuring Method Range Accuracy Resolution Working Environment Calibration Method Respond Time Temperature Compensation Power Supply Size Protection level Service Life Cable Sensor housing material Specifications Rs-485,MODBUS/RTU Non contact electromagnetic principle 0 ~ 70PSU ±1%F.S. or ±0.2PSU(Below 10psu) 0.1PSU 0 ~ 65; < 0.6MPa Two point calibration 10 seconds T90 Automatic temperature compensation(PT1000) 12-24VDC±10%, 10mA; Diameter 30mm; Length 185.5mm; IP68; The water depth is 20 meters; Other customization 3 years or above 5m PVC;PEEK; 4. Wiring Please wiring as shown below: Wire color Brown Black Blue White Bare line Description Power (12-24VDC) GND RS485A RS485B Shielding Layer 5. Maintenance and Precautions 5.1 Maintenance Inductive electrode is basically maintenance free; It is recommended to clean up the sensor probe attachment every 30 days; Avoid the use of hard objects to cause the damage of the light guide part of the measuring probe during cleaning; Please wipe with a soft damp cloth. It is recommended to clean the outer surface of the sensor with water flow. If there is still debris residue, please wipe it with a wet soft cloth. 5.2 Note Installation measurement: avoid the installation measurement at the place where the water flow is turbulent, and reduce the influence of water bubbles on the measurement. Keep the measuring probe 2cm away from the bottom. The probe of the sensor is fouling or attached with more organisms, so the cleaning force can be increased appropriately. Slight scratch on the probe surface does not affect the normal use of the sensor. But pay attention not to penetrate the shell of the probe. Suggestion: the protective cover of our company should be selected to prevent the influence of microbial attachment on the measurement results. 5.3 Other Problem Possible Causes The operation interface cannot be connected or the measurement results are not displayed Wrong cable connection Solution Check the wiring mode are not displayed The measured value is too high, too low or the value is continuously unstable Wrong sensor address The sensor probe is attached by foreign objects Other Check the address for errors Clean the sensor probe surface Contact after sales 6. Modbus RTU Protocol 6.1 Information frame format The default data format for Modbus communication of this sensor is: Baud rate Device address Data bits Parity check Stop bit MODBUS-RTU 9600 (default) 1 (default) 8 bit None 1bit Function code 03: read (R) register value Function code 06: write (W) single register value 6.2 Register Address Register Address (hex) Name R/W Introductions Number of registers (byte) Data type 0x0100 Temperature value R value x10 (for example: the temperature of 25.6 is displayed as 256, the default is 1 decimal.) 1 (2 bytes) unsigned short 0x0101 Salinity value R PSU value x10 (for example, the salinity value of 12.1psu is 1 (2 displayed as 121, with 1 decimal place by default.) bytes) unsigned short 0x1000 Temperature calibration Temperature calibration: the written data is the actual R/W temperature value X10; Read out data is temperature calibration offset X10. 0x1001 Zero point calibration R/W Zero point calibration in air. The data written during calibration is 0. 1 (2 bytes) 1 (2 bytes) unsigned short unsigned short 0x1003 Slope calibration 0x2000 Sensor address 0x2003 Baud rate setting Calibrate in the known standard solution (50% - 100% R/W range), and write the data as the actual value of the standard solution × 10. 1 (2 bytes) R/W The default is 1, and the data range is 1-127. 1 (2 bytes) R/W The default is 9600. Write 0 is 4800; Write 1 is 9600; Write 2 is 19200. 1 (2 bytes) unsigned short unsigned short unsigned short 0x2020 Restore factory settings The calibration value is restored to the default value and W the written data is 0. Note that the sensor needs to be calibrated again after reset. 1 (2 bytes) unsigned short 6.3 Data structure type Integer unsigned int (unsigned short) The data consists of two integers. XXXX XXXX Byte1 Float Float, According to IEEE 754 (single precision); The data consists of 1 sign bit, 8-bit exponent, and a 23 bit mantissa . XXXX XXXX Byte0 XXXX XXXX Sign bit Byte3 XXXX XXXX Byte2 Exp digit XXXX XXXX Byte1 F decimal XXXX XXXX Byte0 6.4 Modbus RTU command 6.4.1 Function code 03h: read register value Host send 1 2 ADR 03H 3 4 Start register high byte Start register low byte 5 Register number high byte 6 7 8 Number of registers low byte CRC low byte CRC high byte The first byte ADR: slave address code (= 001 ~ 254) Byte 2 03h: read register value function code Byte 3 and 4: start address of register to be read To read the FCC instrument, Bytes 5 and 6: number of registers to read Bytes 7 and 8: CRC16 checksums from bytes 1 to 6 Slave return 1 2 ADR 03H 3 total bytes 4 , 5 6 , 7 Register data Register data 1 2 M-1 , M M+1 ...... Register data M CRC low byte M+2 CRC high byte The first byte ADR: slave address code (= 001 ~ 254) Byte 2 03h: return to read function code The third byte: the total number of bytes from 4 to m (including 4 and m) Bytes 4 to m: register data Byte m + 1, M + 2: CRC16 check sum from byte 1 to M When the slave receives an error, the slave returns the error: 1 ADR 2 83H 3 Information code 4 CRC low byte 5 CRC high byte The first byte ADR: slave address code (= 001 ~ 254) Byte 2 83h: error reading register value Byte 3 information code: 01 - function code error 03 - data error Bytes 4 and 5: CRC16 checksums from bytes 1 to 3 6.4.2 Function code 06h: write single register value Host send 1 2 ADR 06 3 Register high byte address 4 5 Register low byte address Data high byte 6 Data low byte 7 CRC code Low byte 8 CRC code High byte When the slave receives correctly, the slave sends back: 1 2 3 4 5 ADR 06 Register high byte address Register low byte address Data high byte 6 Data low byte 7 CRC code Low byte 8 CRC code High byte When the slave receives an error, the slave returns: 1 2 3 4 ADR 86H Error code information code CRC code Low byte 5 CRC code High byte The first byte ADR: slave address code (= 001 ~ 254) The second byte 86h: write register value error function code Byte 3 error code information code: 01 - function code error 03 - data error Byte 4 and 5: CRC check sum from byte 1 to 3 6.5 Command example 6.5.1 Default register: a) Change slave address: Address:0x2000 (42001) Number of registers: 1 Function code: 0x06 Default sensor address: 01 Change the Modbus device address of the sensor, and change the device address from 01 to 06. The example is as follows: Send command: 01 06 20 00 00 06 02 08 Respond: 01 06 20 00 00 06 02 08; Note: the address is changed to 06 and stored after power failure. b) Baud rate: Address: 0x2003 (42004) Number of registers: 1 Function code: 0x06 Default value: 1 (9600bps) Supported values: 0-2 (4800-19200bps) The baud rate can be changed by the upper computer setting, and it can work without restart after the change. The baud rate saves the upper computer setting after power failure. Baud rate support 4800 9600 19200. The baud rate of integer value allocation is as follows: Integer 0 1 2 Baud rate 4800 bps 9600 bps 19200 bps Send command: 01 06 20 03 00 02 F3 CB Respond: 01 06 20 03 00 02 F3 CB Note: the baud rate is changed to 19200bps and saved after power failure. 6.5.2 Function register: a) Measuring temperature command: Address: 0x0100 (40101) Number of registers: 1 Function code: 0x03 Read sample values: 19.2 Send command: 01 03 01 00 00 01 85 F6 Respond: 01 03 02 00 C0 B8 14 Returns hexadecimal unsigned integer data, temperature value = integer / 10, 1 bit decimal place is reserved. b) Salinity measurement instruction: Address: 0x0101 (0x40102) Number of registers: 1 Function code: 0x03 Read sample values: 9.1PSU Send command: 01 03 01 01 00 01 D4 36 Respond: 01 03 02 00 5B F9 BF Register returns hexadecimal unsigned integer data, salinity value = integer / 10, 1 decimal place reserved. c) Continuous reading of temperature and salinity instructions: Address: 0x0100 (40101) Number of registers: 2 Function code: 0x03 Read sample values: Temperature 19.2 and salinity 9.1 PSU Send command: 01 03 01 00 00 02 C5 F7 Respond: 01 03 04 00 C0 00 5B BB F4 Register returns hexadecimal unsigned integer data, temperature value = integer / 10, 1 decimal place reserved Register returns hexadecimal unsigned integer data, salinity value = integer / 10, 1 decimal place reserved. d) Humidity measurement command: Address: 0x0107 (40108) Number of registers: 1 Function code: 0x03 Read sample values: relative humidity 40% Send command: 01 03 01 07 00 01 34 37 Respond: 01 03 02 01 90 B9 B8 Register returns hexadecimal unsigned integer data, humidity value = integer / 10, 1 decimal place reserved. 6.5.3 Calibration instruction: a) Temperature calibration Address: 0x1000 (41001) Number of registers: 1 Function code: 0x06 Calibration example: calibration at 25.8 ° C Send command: 01 06 10 00 01 02 0D 5B Respond: 01 06 10 00 01 02 0D 5B The sensor needs to be calibrated in a constant temperature environment after the temperature indication no longer fluctuates. b) Salinity zero calibration Address: 0x1001 (41002) Number of registers: 1 Function code: 0x06 Calibration example: calibration in air Send command: 01 06 10 01 00 00 DC CA Respond: 01 06 10 01 00 00 DC CA c) Salinity slope calibration Address: 0x1003 (41004) Number of registers: 1 Function code: 0x06 Calibration example: calibration in 50 PSU salinity solution Send command: 01 06 10 03 01 F4 7D 1D Respond: 01 06 10 03 01 F4 7D 1D 7. Dimensions 8. Contact Manufacturer Daviteq Technologies Inc No.11 Street 2G, Nam Hung Vuong Res., An Lac Ward, Binh Tan Dist., Ho Chi Minh City, Vietnam. Tel: +84-28-6268.2523/4 (ext.122) Email: info@daviteq.com | www.daviteq.com
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