Introduction to Conductivity and Salinity Sensors

The Y521-A online conductivity (salinity) sensor launched by Yushan Sensing adopts internationally leading four electrode technology, RS485 digital interface, and supports MODBUS protocol. Compared to traditional two electrode sensors, it has higher accuracy, wider measurement range, and better stability.

Sensor features:

1. RS-485 digital sensor, standard MODBUS protocol;

2. Synchronize the output of parameters such as conductivity, salinity, TDS, and temperature;

3. Built in temperature sensor with automatic temperature compensation;

4. Strong anti polarization effect, can be used online for a long time.

Conductivity and salinity sensor parameters

The above technical parameters are all data obtained under laboratory standard solution environment; The lifespan and maintenance calibration frequency of sensors are related to the actual on-site working conditions.※

Suzhou Yushan Sensing Technology Co., Ltd

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Y521-A Four electrode Conductivity Sensor. pdf

Y521-A Conductivity Salinity Sensor Calibration Video.mp4

Calibration steps for Y521-A conductivity salinity sensor

1. Required tools and raw materials

Required equipment: 2 250mL beakers, 1 fixed tube, 1 pair of gloves

Raw materials: 1.4083mS/cm conductivity standard solution, 12.852mS/cm conductivity standard solution

2. Calibration steps

Y521-A Yushan four electrode conductivity salinity sensor supports 1-point and 2-point calibration.

The 1-point calibration is completed at 1.4083mS/cm, and the k value of the sensor is changed;

Two point calibration was completed in standard solutions of 1.4083mS/cm and 12.852mS/cm, changing the k and B values of the sensor.

(1) 1-point calibration steps (changing K value)

Step 1:Put an appropriate amount of 1.4083mS/cm conductivity standard solution into a 250mL bottle, place the sensor in the bottle, and gently shake the sensor to remove bubbles at the front end of the sensor;

Step 2:Insert the RS485 to USB connector connected to the sensor cable into the computer, open the SmartPC testing software on the computer, pull down "Port", select the corresponding COM port, and then measure to obtain real-time measurement values of conductivity, TDS, and temperature;

Step 3:Click 'Stop' to end the data measurement, and then click 'Calibrate'. In the "Automatic Calibration" interface, write the "Single Point/First Point Calibration Value" as 1.4083, click "1 Point" to perform one point calibration, wait for the value in the pop-up window to stabilize, and click "OK" to complete the calibration. Click on 'Get' again and check if the K value is written correctly;

Step 4:Click "Start" on the "CT" interface to obtain the conductivity, TDS， Real time measurement of salinity and temperature, check if the conductivity value is close to 1.41mS/cm, and verify if the calibration is successful.

(2) 2-point calibration steps (changing K and B values)

Step 1:Put an appropriate amount of 1.4083mS/cm conductivity standard solution into a 250mL bottle, and put an appropriate amount of 12.852mS/cm conductivity standard solution into another 250mL bottle;

Step 2:Place the sensor into a beaker containing 1.4083mS/cm conductivity standard solution, gently shake the sensor to remove any bubbles at the front end of the sensor;

Step 3:Insert the RS485 to USB connector connected to the sensor cable into the computer, open the SmartPC testing software on the computer, click "Connect" and "Measure", then click "Start" to obtain the conductivity, TDS， Real time measurement values of salinity and temperature;

Step 4:Click 'Stop' to end the data measurement, and then click 'Calibrate'. In the "Automatic Calibration" interface, write the "Single Point/First Point Calibration Value" as 1.4083 and the "Second Point Calibration Value" as 12.852. Click "2 Points" to perform two-point calibration, wait for the sensor calibration value to stabilize in the first standard solution, click "OK", then clean the sensor with distilled water or deionized water, dry it, and place it in a bottle containing 12.852mS/cm conductivity standard solution. Wait for the sensor calibration value to stabilize in the second standard solution, and click "OK" to complete the calibration. Click on 'Get' again and check if the K and B values are written correctly;

Step 5:Click "Start" on the "CT" interface to obtain the conductivity, TDS， Real time measurement of salinity and temperature, check if the conductivity value is close to 12.85mS/cm, and verify if the two-point calibration is successful.