Table of Contents:

1. DR-ECK Water EC Probe

1.1 Specification:

1.2 Application for Different Range

image-20240714173018-1.png

1.3 Wiring

image-20240720172533-1.png

1.4 Mechinical Drawing

image-20240714174241-2.png

1.5 Installation

Electrode installation form:

A: Side wall installation

B: Top flange installation

C: Pipeline bend installation

D: Pipeline bend installation

E: Flow-through installation

F: Submerged installation

image-20240718190121-1.png

Several common installation methods of electrodes

When installing the sensor on site, you should strictly follow the correct installation method shown in the following picture. Incorrect installation method will cause data deviation.

A. Several common incorrect installation methods

image-20240718190204-2.png

Error cause: The electrode joint is too long, the extension part is too short, the sensor is easy to form a dead cavity, resulting in measurement error.

image-20240718190221-3.png

Error cause: Measurement error or instability may occur due to water flow not being able to fill the pipe or air accumulation at high altitudes.

B. Correct installation method

image-20240718190249-4.png

1.6 Maintenance

1.7 RS485 Commands

RS485 signal (K1 default address 0x12; K10 default address 0x11):
Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1

1.7.1 Query address

send:

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0XFE 0X030X000X500X000X000X510XD4

If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, which can be used as a method of address query.

response:

New addressFunction codeData lengthCRC16 lowCRC16 high
0X010X030X000X200XF0

1.7.2 Change address

For example: Change the address of the sensor with address 1 to 2, master → slave

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X010X060X000X500X000X020X080X1A

If the sensor receives correctly, the data is returned along the original path.

Note: If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, and the return address is still the original address, which can be used as a method of address query.

1.7.3 Modify intercept

send:

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X010X060X000X230X000X010XF8

0X07

Change the intercept of the sensor with address 1 to 10 (default 0), which is 0X000A in the command.

response:

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X010X06

0X02

0X000X000X0A0X38

0X8F

1.7.4 Query data

Query the data (EC,temperature) of the sensor (address 11), host → slave

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X110X030X000X000X000X020XC60X9B

If the sensor receives correctly, the following data will be returned, slave → host

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowRegister 1 Data highRegister 1 Data lowCRC16 lowCRC16 high
0X110X030X040X020XAE0X010X640X8B0XD0

The address of the EC K10 sensor is 11

The query data command is 11 03 00 00 00 02 C6 9B

For example, the returned data is 11 03 04 02 AE 01 64 8B D0. 02 AE is converted to decimal 686,  K=10, EC: 6860uS/cm,temperature: 35.6℃ Convert the returned data to decimal and divide by 10.

Query the data (EC,temperature) of the sensor (address 11), host → slave

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X120X030X000X000X000X020XC60XA8

If the sensor receives correctly, the following data will be returned, slave → host

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowRegister 1 Data highRegister 1 Data lowCRC16 lowCRC16 high
0X120X030X040X020XAE0X010X640XB80XD0

The address of the EC K1 sensor is 12

The query data command is 12 03 00 00 00 02 C6 A8

For example, the returned data is 12 03 04 02 AE 01 64 B8 D0. 02 AE is converted to decimal 686,   K=1, EC: 686uS/cm,temperature: 35.6℃ Convert the returned data to decimal and divide by 10.

1.7.5 Calibration Method

This device uses one-point calibration, and you need to prepare a known E standard solution. When mileage K=1, 1~2000 uses 1413μS/cm standard solution, and when mileage K=10, 10~20000 uses 12.88mS/cm standard solution.

The calibration steps are as follows:

(1) Place the electrode in distilled water and clean it. When mileage 1~2000 uses 1413μS/cm standard solution, enter the following calibration command after the data is stable.

AddressFunction codeAddress highAddress lowQuantity highQuantity lowData lengthDataCRC16 lowCRC16 high
0X120X100X000X260X000X020X04

0X00
0X00
0X37
0X32

0XBD0XFC

1413*10 gives 0X00003732

response:

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X120X100X000X260X000X020XA20XA0

(2) Place the electrode in distilled water to clean it. Use 12.88mS/cm standard solution for the range of 10~20000. After the data is stable, enter the following calibration command

AddressFunction codeAddress highAddress lowQuantity highQuantity lowData lengthDataCRC16 lowCRC16 high
0X110X100X000X260X000X020X04

0X00
0X01
0XF7
0X20

0X330X75

12880*10 gives 0X01F720

response:

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X110X060X000X260X000X020XEB0X50

2. DR-PH01 Water PH Sensor

2.1 Specification

2.2 Wiring

image-20240720172548-2.png

2.3 Mechinical Drawing

image-20240714174241-2.png

2.4 Installation Notice

Do not power on while connect the cables. Double check the wiring before power on.

Installation Photo as reference:

Submerged installation:

The lead wire of the equipment passes through the waterproof pipe, and the 3/4 thread on the top of the equipment is connected to the 3/4 thread of the waterproof pipe with raw tape. Ensure that the top of the equipment and the equipment wire are not flooded.

image-20240718191348-6.png

Pipeline installation:

Connect the equipment to the pipeline through the 3/4 thread.

image-20240718191336-5.png

Sampling:

Take representative water samples according to sampling requirements. If it is inconvenient to take samples, you can also put the electrode into the solution to be tested and read the output data. After a period of time, take out the electrode and clean it.

Measure the pH of the water sample:

First rinse the electrode with distilled water, then rinse it with the water sample, then immerse the electrode in the sample, carefully shake the test cup or stir it to accelerate the electrode balance, let it stand, and record the pH value when the reading is stable.

2.5 Maintenance

2.6 RS485 Commands

RS485 signaldefault address 0x10
Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1

2.6.1 Query address

send:

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0XFE 0X030X000X500X000X000X510XD4

response:

New addressFunction codeData lengthCRC16 lowCRC16 high
0X010X030X000X200XF0

2.6.2 Change address

For example: Change the address of the sensor with address 1 to 2, master → slave

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X010X060X000X500X000X020X080X1A

If the sensor receives correctly, the data is returned along the original path.

Note: If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, and the return address is still the original address, which can be used as a method of address query.

2.6.3 Modify intercept

send:

AddressFunction codeStarting register address highStarting register address  lowRegister Length highRegister Length lowCRC16 lowCRC16 high
0X100X060X000X100X000X640X8A

0XA5

Change the intercept of the sensor at address 10 to 1 (default is 0). You need to pass the intercept 1*100 =100 into the command 0x006.

response:

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X100X06

0X00

0X100X000X640X8A

0XA5

2.6.4 Query data

Query the data (PH) of the sensor (address 10), host → slave

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X100X030X000X000X000X010X870X4B

If the sensor receives correctly, the following data will be returned, slave → host

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowCRC16 lowCRC16 high
0X100X030X020X020XAE0XC40X9B

The query data command is 10 03 00 00 00 01 87 4B. After the query, 7 bytes will be returned.

For example, the returned data is 10 03 02 02 AE C4 9B.

02 AE is the pH value, which is converted into decimal to get 686, and then two decimal places are added to get the actual value. 02 AE means the current pH value is 6.86.

2.6.5 Calibration Method

This device uses three-point calibration, and three known pH standard solutions need to be prepared.

The calibration steps are as follows:

(1) Place the electrode in distilled water to clean it, and then place it in 9.18 standard buffer solution. After the data stabilizes, enter the following calibration command, and the 9.18 calibration is completed.

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X100X06

0X00

0X200XFF0XFF0X8A

0XF1

(2) Wash the electrode in distilled water and place it in 6.86 standard buffer. After the data stabilizes, enter the following calibration command. The 6.86 calibration is completed.

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X100X06

0X00

0X210XFF0XFF0XDB

0X31

(3) Wash the electrode in distilled water and place it in 4.01 standard buffer. After the data stabilizes, enter the following calibration command, and the 4.00 calibration is completed.

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X100X06

0X00

0X220XFF0XFF0X2B

0X31

After the above three steps are completed, the calibration is successful. The advantage of three-point calibration compared to two-point calibration is that the electrode is calibrated separately in the acid and alkali parts, thereby achieving accurate calibration of the full range and making the measurement data more accurate.

3. DR-ORP1 Water ORP Sensor

3.1 Specification

3.2 Wiring

image-20240720172620-3.png

3.3 Mechinical Drawing

image-20240714174241-2.png

3.4 Installation Notice

Do not power on while connect the cables. Double check the wiring before power on.

Installation Photo as reference:

 Submerged installation:

The lead wire of the equipment passes through the waterproof pipe, and the 3/4 thread on the top of the equipment is connected to the 3/4 thread of the waterproof pipe with raw tape. Ensure that the top of the equipment and the equipment wire are not flooded.

image-20240718191348-6.png

 Pipeline installation:

Connect the equipment to the pipeline through the 3/4 thread.

image-20240718191336-5.png

3.5  Maintenance

(1) The equipment itself generally does not require daily maintenance. When an obvious fault occurs, please do not open it and repair it yourself, and contact us as soon as possible.

(2) In general, ORP electrodes do not need to be calibrated and can be used directly. When there is doubt about the quality and test results of the ORP electrode, the electrode potential can be checked with an ORP standard solution to determine whether the ORP electrode meets the measurement requirements, and the electrode can be recalibrated or replaced with a new ORP electrode. The frequency of calibration or inspection of the measuring electrode depends on different application conditions (the degree of dirt in the application, the deposition of chemical substances, etc.).

(3) There is an appropriate soaking solution in the protective bottle at the front end of the electrode, and the electrode head is soaked in it to ensure the activation of the platinum sheet and the liquid junction. When measuring, loosen the bottle cap, pull out the electrode, and rinse it with pure water before use.

(4) Preparation of electrode soaking solution: Take 25 grams of analytical pure potassium chloride and dissolve it in 100 ml of pure water to prepare a 3.3M potassium chloride solution.

(5) Before measuring, the bubbles in the electrode glass bulb should be shaken off, otherwise it will affect the measurement. When measuring, the electrode should be stirred in the measured solution and then placed still to accelerate the response.

(6) The electrode should be cleaned with deionized water before and after the measurement to ensure the measurement accuracy.

(7) After long-term use, the ORP electrode will be passivated, which is manifested as a decrease in sensitivity gradient, slow response, and inaccurate readings. At this time, the platinum sheet at the bottom of the electrode can be soaked in 0.1M dilute hydrochloric acid for 24 hours (0.1M dilute hydrochloric acid preparation: 9 ml of hydrochloric acid is diluted to 1000 ml with distilled water), and then soaked in 3.3M potassium chloride solution for 24 hours to restore its performance.

(8) Electrode contamination or liquid junction blockage can also cause electrode passivation. At this time, it should be cleaned with an appropriate solution according to the nature of the contaminant. If the platinum of the electrode is severely contaminated and an oxide film is formed, toothpaste can be applied to the platinum surface and then gently scrubbed to restore the platinum's luster.

(9) The equipment should be calibrated before each use. It is recommended to calibrate once every 3 months for long-term use. The calibration frequency should be adjusted appropriately according to different application conditions (degree of dirt in the application, deposition of chemical substances, etc.). After aging, the electrodes should be replaced in time.

3.6 RS485 Commands

RS485 signaldefault address 0x13
Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1

3.6.1 Query address

send:

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0XFE 0X030X000X500X000X000X510XD4

response:

New addressFunction codeData lengthCRC16 lowCRC16 high
0X010X030X000X200XF0

3.6.2 Change address

For example: Change the address of the sensor with address 1 to 2, master → slave

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X010X060X000X500X000X020X080X1A

If the sensor receives correctly, the data is returned along the original path.

Note: If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, and the return address is still the original address, which can be used as a method of address query.

3.6.3 Modify intercept

send:

AddressFunction codeStarting register address highStarting register address  lowRegister Length highRegister Length lowCRC16 lowCRC16 high
0X130X060X000X100X000X640X8A

0X96

Change the intercept of the sensor with address 1 to 10 (default 0), which is 0X000A in the command.

response:

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X130X06

0X00

0X100X000X640X8A

0X96

3.6.4 Query data

Query the data (ORP) of the sensor (address 13), host → slave

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X130X030X000X000X000X010X870X78

If the sensor receives correctly, the following data will be returned, slave → host

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowCRC16 lowCRC16 high
0X130X030X020X020XAE0X800X9B

The query data command is 13 03 00 00 00 01 87 78

For example, the returned data is 13 03 02 02 AE 80 9B.

02 AE is the ORP value, converted to decimal, the actual value is 686, 02 AE means the current ORP value is 686mV

3.6.5 Calibration Method

This device uses two-point calibration, and two known ORP standard solutions need to be prepared. The calibration steps are as follows:
(1) Place the electrode in distilled water to clean it, and then place it in 86mV standard buffer solution. After the data stabilizes,
enter the following calibration command, and the 86mV point calibration is completed;

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X130X06

0X00

0X240XFF0XFF0XCB

0X03

Wash the electrode in distilled water and place it in 256mV standard buffer. After the data is stable, enter the following calibration command to complete the 256mV point calibration.

AddressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X130X06

0X00

0X250XFF0XFF0X9A

0XC3

4. DR-DO1 Dissolved Oxygen Sensor

4.1 Specification

4.2 wiring

image-20240720172632-4.png

4.3 Impedance requirements for current signals

Supply Voltage9V12V20V24V
Max Impedance<250Ω<400Ω<500Ω<900Ω

4.4 Mechinical Drawing

image-20240719155308-1.png

4.5 Instructions for use and maintenance

4.6 RS485 Commands

RS485 signaldefault address 0x14
Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1

4.6.1 Query address

send:

Original addressFunction codeRegister address highRegister address lowRegister length highRegister length lowCRC16 lowCRC16 high
0XFF0X030X000X0A0X000X020XF10XD7

If you forget the original address of the sensor, you can use the broadcast address 0XFF instead. When using 0XFE, the host can only connect to one slave, which can be used as a method of address query.

response:

Register 0 data high and register 0 data low indicate the actual address of the sensor: 1
Register 1 data high and register 1 data low indicate the sensor version

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowRegister 1 Data highRegister 1 Data lowCRC16 lowCRC16 high
0XFF0X030X040X000X010X000X000XB40X3C

4.6.2 Change address

For example: Change the address of the sensor with address 1 to 2(address range: 1-119), master → slave

Original addressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowData lengthStart address highStart address lowSensor versionSensor versionCRC16 highCRC16 low
0X010X100X000X0A0X000X020X040X000X020X000X000XD20X10

response:

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X010X100X000X0A0X000X020X610XCA

4.6.3 Query data

Query the data (dissolved oxygen) of the sensor (address 14), host → slave

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X140X030X000X140X000X010XC60XCB

If the sensor receives correctly, the following data will be returned, slave → host

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowCRC16 lowCRC16 high
0X140X030X020X030X780XB50X55

After the query, 7 bytes will be returned. For example, the returned data is 14 03 02 03 78 B5 55. 03 78 is the value of dissolved oxygen.

Converted to decimal, it is 888. Add two decimal places to get the actual value. 03 78 means the current dissolved oxygen is 8.88mg/L

Query the data (temperature) of the sensor (address 14), host → slave

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X140X030X000X110X000X010XD60XCA

If the sensor receives correctly, the following data will be returned, slave → host

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowCRC16 lowCRC16 high
0X140X030X020X090XA40XB20X6C

After the query, 7 bytes will be returned. For example, the returned data is 14 03 02 09 A4 B2 6C. 03 78 is the value of dissolved oxygen temperature.

Converted to decimal, it is 2468. Add two decimal places to get the actual value. 09 A4 means the current dissolved oxygen temperature is 24.68°C

5. DR-TS1 Water Turbidity Sensor

5.1 Specification

5.2 wiring

image-20240720172640-5.png

5.3 Impedance requirements for current signals

Supply Voltage9V12V20V24V
Max Impedance<250Ω<400Ω<500Ω<900Ω

5.4 Mechinical Drawing

image-20240718195058-7.png

5.5 Instructions for use and maintenance

5.6 RS485 Commands

RS485 signaldefault address 0x15
Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1

5.6.1 Query address

send:

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0XFE 0X030X000X500X000X000X510XD4

If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, which can be used as a method of address query.

response:

New addressFunction codeData lengthCRC16 lowCRC16 high
0X010X030X000X200XF0

5.6.2 Change address

For example: Change the address of the sensor with address 1 to 2, master → slave

Original addressFunction codeAddress highAddress lowQuantity highQuantity lowCRC16 lowCRC16 high
0X010X060X000X500X000X020X080X1A

If the sensor receives correctly, the data is returned along the original path.

Note: If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, and the return address is still the original address, which can be used as a method of address query.

5.6.3 Query data

Query the data (turbidity) of the sensor (address 15), host → slave

AddressFunction codeStarting register address highStarting register address lowRegister length highRegister length lowCRC16 lowCRC16 high
0X150X030X000X000X000X010X870X1E

If the sensor receives correctly, the following data will be returned, slave → host

AddressFunction codeData lengthRegister 0 Data highRegister 0 Data lowCRC16 lowCRC16 high
0X150X030X020X020X9A0X090X4C

The query data command is 15 03 00 00 00 01 87 1E

For example, the returned data is 15 03 02 02 9A 09 4C

02 9A is the turbidity value, converted to decimal, it is 666, and then divided by 10, the actual value is 66.6, 02 9A means the current turbidity value is 66.6 NTU

6.  Water Quality Sensor Datasheet