Analog Electrical Conductivity Sensor

The Analog Electrical Conductivity Meter V2 is specially used to measure the electrical conductivity of aqueous solution, and then to evaluate the water quality, which is often used in water culture, aquaculture, environmental water detection and other fields. It supports 3 ~ 5V wide voltage input, and is compatible with 5V and 3.3V main control board. The output signal filtered by hardware has low jitters; the excitation source adopts AC signal, which effectively reduces the polarization effect, improves the precision and prolongs the life of the probe; The software library uses two-point calibration method, and can automatically identify standard buffer solution, so simple and convenient.



With this product, main control board (such as Arduino) and the software library, you can quickly build an electrical conductivity meter, plug and play, no welding. DFRobot provides a variety of water quality sensor products, uniform size and interface, not only meet the needs of various water quality testing, but also suitable for the DIY of multi-parameter water quality tester. Conductivity is the reciprocal of the resistance, which is related to the ability of the material to carry the current. In the liquid, the reciprocal of the resistance, the conductivity, is the measure of its ability to conduct electricity. Conductivity is an important parameter of water quality. It can reflect the extent of electrolytes present in water.

Please Note: In order to ensure the measurement accuracy, it is strongly recommended to add a temperature sensor to measure the temperature, and achieve automatic temperature compensation. DS18B20 waterproof temperature sensor can also be used.

Quick Spec

Signal Conversion Board (Transmitter) V2

• Supply Voltage: 3.0~5.0V
• Output Voltage: 0~3.4V
• Probe Connector: BNC
• Signal Connector: PH2.0-3Pin
• Measurement Accuracy: ±5% F.S.
• Board size: 42 x 32 mm

Electrical Conductivity Probe

• Probe Type: Laboratory Grade
• Cell Constant: 1.0
• Support Detection Range: 0~20ms/cm
• Recommended Detection Range: 1~15ms/cm
• Temperature Range: 0~40°C
• Probe Life: >0.5 year (depending on frequency of use)
• Cable Length: 100cm

Please Note: The probe is a laboratory-grade probe. Do not immerse in liquid for a long time. Otherwise this will shorten the life of the probe. ThePlatinum black layer is attached to the surface of the sheet metal in the probe. It should avoid any object touching it. It can only be washed with distilled water, otherwise the platinum black layer will be damaged, resulting in inaccurate measurement.

Wiring Diagram

Sample Code

/*
 * file DFRobot_EC.ino
 * @ https://github.com/DFRobot/DFRobot_EC
 *
 * This is the sample code for Gravity: Analog Electrical Conductivity Sensor / Meter Kit V2 (K=1.0), SKU: DFR0300.
 * In order to guarantee precision, a temperature sensor such as DS18B20 is needed, to execute automatic temperature compensation.
 * You can send commands in the serial monitor to execute the calibration.
 * Serial Commands:
 *   enter -> enter the calibration mode
 *   cal -> calibrate with the standard buffer solution, two buffer solutions(1413us/cm and 12.88ms/cm) will be automatically recognized
 *   exit -> save the calibrated parameters and exit from calibration mode
 *
 * Copyright   [DFRobot](http://www.dfrobot.com), 2018
 * Copyright   GNU Lesser General Public License
 *
 * version  V1.0
 * date  2018-03-21
 */

#include "DFRobot_EC.h"
#include 

#define EC_PIN A1
float voltage,ecValue,temperature = 25;
DFRobot_EC ec;

void setup()
{
  Serial.begin(115200);
  ec.begin();
}

void loop()
{
    static unsigned long timepoint = millis();
    if(millis()-timepoint>1000U)  //time interval: 1s
    {
      timepoint = millis();
      voltage = analogRead(EC_PIN)/1024.0*5000;  // read the voltage
      //temperature = readTemperature();  // read your temperature sensor to execute temperature compensation
      ecValue =  ec.readEC(voltage,temperature);  // convert voltage to EC with temperature compensation
      Serial.print("temperature:");
      Serial.print(temperature,1);
      Serial.print("^C  EC:");
      Serial.print(ecValue,2);
      Serial.println("ms/cm");
    }
    ec.calibration(voltage,temperature);  // calibration process by Serail CMD
}

float readTemperature()
{
  //add your code here to get the temperature from your temperature sensor
}

Resources

• Product Page
• Product Wiki
• PCB Layout
• DFRobot_EC Library (Github)

Shipping List

• 1 x Electrical Conductivity Probe（K=1,Laboratory Grade
• 1 x Signal Conversion Board (Transmitter) V2
• 2 x Standard Buffer Solution 1413us/cm
• 2 x Standard Buffer Solution 12.88ms/cm
• 1 x Gravity Analog Sensor Cable
• 2 x Waterproof Gasket
• 1 x Screw Cap for BNC Connector
• 4 x M3 * 10 nylon pillar
• 8 x M3 * 5 screw