Renke RS-EC-N01-2-SUS01 Water Conductivity Sensor -20~100℃, RS485/4-20mA/0-10V/0-5V Output

The cell constant (K) determines the measurement range and optimal application. The K=1 setting (1-2000 µS/cm) is designed for low-conductivity solutions like pure water, freshwater, or soft water. The K=10 setting (10-20000 µS/cm) is for higher conductivity media such as seawater, wastewater, or nutrient-rich solutions. You must select the appropriate constant during sensor configuration for accurate readings.

The RS485 interface uses the Modbus RTU protocol. Connect the sensor's A/B lines to your RS485 transceiver or converter (e.g., USB-to-RS485). You will need to use Modbus polling software or write code to read the holding registers containing conductivity and temperature data. The default baud rate is typically 9600, 8N1, but consult the datasheet for the specific register map and communication parameters.

Yes, for highest accuracy, periodic calibration is recommended using standard conductivity solutions. Calibration typically involves a two-point process: first with a low-conductivity standard (e.g., 1413 µS/cm) and then with a high-conductivity standard or a known resistance. The procedure is performed via the RS485 interface by sending specific Modbus commands to write calibration values to the sensor's internal registers. Analog output scaling can be adjusted independently.

ATC corrects the raw conductivity value to a standard reference temperature (default 25°C) because ionic mobility and solution conductivity are temperature-dependent. The compensation is based on a programmable temperature coefficient (β, default 0.02). You can adjust both the reference temperature and the β coefficient via the RS485 interface to match the specific characteristics of your measured solution, which is critical for accurate long-term monitoring.