PH4502C Ph Meter Module

Ph4502c Liquid Water Ph Measurement Sensor Module 

Analog Output Liquid 0-14Ph Detector BNC Socket Ph Meter Test Aquarium Hydroponic Laboratory Acid Base

Only the board is shipped. The probe is not included.

     PH4502C is a liquid ph measurement and monitoring sensor module. It is used with a bnc input ph electrode probe. It produces an analog voltage output to measure the acidic or basic character of the liquid. It can be used in Arduino and similar microcontroller projects for water quality monitoring, laboratory experiments, liquid monitoring systems and educational applications.

     The module operates with a 5V supply. The measurement range is between ph0 and ph14. The output type is an analog voltage signal. There are 2 trimpots on the board. One of them is used for analog offset adjustment, the other for ph limit adjustment. The trimpot close to the bnc connector is generally for offset calibration.

     The board has to, do, po, g, g and v+ pins. The Po pin is the analog ph output and is connected to the analog input of the microcontroller. The Do pin is the trigger output tied to the adjustable limit threshold. The V+ pin is the 5V supply input. The G pins are for the ground connection. The To pin is marked as the temperature output.

     On this type of board, the neutral ph7 point is read as offset rather than directly at 0V. In common use, the probe is removed, the bnc terminals are short circuited and the offset trimpot is adjusted so that the po output is 2.5V. After this adjustment, the board works so that it centers the neutral value. Then, in real measurements, the ph value is calculated from the analog output.

     Calibration is required for accurate results during use. It is recommended to rinse the probe with deionized or distilled water after measurement. After the probe is immersed in the solution, a while should be waited for the measurement value to settle. This product is not a professional laboratory device on its own, but a ph sensor interface board used for electronic projects and general purpose measurement applications.

Features:

•     Supply voltage: Dc 5V
•     Operating current: 5mA-10mA
•     Power consumption: 0.5W and below
•     Measurement range: ph0-ph14
•     Response time: 5sec and below
•     Stability time: 60sec and below
•     Nominal temperature: 20C
•     Nominal humidity: 65%RH
•     Operating temperature: 0C  /  60C
•     Connection type: Bnc
•     Mounting holes: 4 pcs M3
•     Dimensions:   42mm x 32mm x 20mm
•     Weight:  25gr

   

  

Pin descriptions:

• To: Temperature output
• Do: Adjustable ph limit trigger output
• Po: Analog ph output
• G: Ground
• G: Ground
• V+: 5V supply

Connection Example

• Po - Arduino A0
• G - Arduino GND
• G - Arduino GND
• V+ - Arduino 5V

Package contents:

•     1 Pcs PH4502C Ph Meter Module

Calibration: You can calibrate the sensor for the most accurate results by following these steps before use:

•     Prepare the connection: With the probe not attached, short circuit the inner and outer parts of the BNC connector. This simulates the ph 7 (neutral) signal.
•     Offset adjustment: Connect your multimeter to the PO and GND pins.
•     Fine adjustment: Turn the blue potentiometer closest to the BNC connector (POT 1) until you see exactly 2.5V at the PO output.
•     Cleaning: After measurement, always rinse the probe with deionized or distilled water and leave it to dry.
•     Note: Due to the plastic parts on the product, the maximum temperature value for safe use has been set as 65C.

#include <Arduino.h>

int pHSense = A0;
int samples = 10;
float adc_resolution = 1024.0;

void setup()
{
    Serial.begin(9600);
    delay(100);
    Serial.println("cimpleo pH Sense");
}

float ph (float voltage) {
    return 7 + ((2.5 - voltage) / 0.18);
}

void loop()
{
    int measurings=0;

    for (int i = 0; i < samples; i++)
    {
        measurings += analogRead(pHSense);
        delay(10);

    }

    float voltage = 5 / adc_resolution * measurings/samples;
    Serial.print("pH= ");
    Serial.println(ph(voltage));
    delay(3000);
}