How to Use conductivity sensor: Examples, Pinouts, and Specs

The Conductivity Sensor is a device used to measure the electrical conductivity in a solution, indicating the ability of the solution to conduct electric current. This sensor is essential in various applications, including water quality monitoring, chemical analysis, and industrial process control. By measuring the conductivity, users can infer the concentration of ions in the solution, which is crucial for maintaining the desired chemical properties.

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power supply.
2. Ground: Connect the GND pin to the ground of the power supply.
3. Analog Output: Connect the AOUT pin to an analog input pin on a microcontroller (e.g., Arduino UNO).

• Calibration: Calibrate the sensor using standard solutions to ensure accurate measurements.
• Temperature Compensation: Conductivity is temperature-dependent. Use a temperature sensor for compensation if precise measurements are required.
• Cleaning: Regularly clean the sensor to prevent fouling and ensure consistent readings.
• Avoid Air Bubbles: Ensure the sensor is fully submerged in the solution without air bubbles, as they can affect the accuracy.

// Conductivity Sensor Example Code for Arduino UNO

const int sensorPin = A0; // Analog input pin for the sensor
float voltage = 0;        // Variable to store the sensor voltage
float conductivity = 0;   // Variable to store the conductivity value

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud rate
}

void loop() {
  voltage = analogRead(sensorPin) * (5.0 / 1023.0); // Read the sensor voltage
  conductivity = voltage * 1000; // Convert voltage to conductivity (mS/cm)
  
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.print(" V, Conductivity: ");
  Serial.print(conductivity);
  Serial.println(" mS/cm");
  
  delay(1000); // Wait for 1 second before the next reading
}

1. Inaccurate Readings: The sensor may provide inaccurate readings if not calibrated properly or if there is fouling on the sensor.
2. No Output Signal: If there is no output signal, check the power supply connections and ensure the sensor is fully submerged in the solution.
3. Fluctuating Readings: Fluctuating readings can be caused by air bubbles or electrical noise. Ensure the sensor is stable and the connections are secure.

• Calibration: Always calibrate the sensor with standard solutions before use.
• Cleaning: Clean the sensor regularly with distilled water to remove any deposits.
• Stable Environment: Ensure the sensor is in a stable environment without air bubbles or electrical interference.
• Check Connections: Verify all connections are secure and the power supply is stable.

By following this documentation, users can effectively utilize the Conductivity Sensor in their projects, ensuring accurate and reliable measurements of solution conductivity.