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Analog pH Sensor Electrode with Amplifier Circuit
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Analog pH Sensor Electrode with Amplifier Circuit
An analog pH sensor electrode with an amplifier circuit is a device that is used to measure the pH, or acidity, of a solution. The sensor consists of a pH electrode and an amplifier circuit that is used to amplify the weak electrical signal that is generated by the electrode. The electrode is typically a glass bulb that is filled with a reference electrolyte solution and a thin layer of glass that is sensitive to hydrogen ions. When the electrode is immersed in a solution, hydrogen ions from the solution migrate through the thin layer of glass and affect the concentration of the electrolyte solution in the bulb. This change in concentration causes a change in the electrical potential of the electrode, which is proportional to the pH of the solution. The amplifier circuit amplifies this signal and provides an output that can be read by a microcontroller or other host device. The analog pH sensor is commonly used in applications such as water treatment plants, aquaculture, and laboratory pH measurement.
The sensor kit comes with a pH probe and sensor board, the latter of which is used for signal conditioning the pH probe output to between 0.5V - 3V . The pH probe is capable of detecting pH levels between 0 to 14. A typical pH sensor consists of two electrodes called a glass electrode and a reference electrode. This sensor can be interfaced to Arduino, Raspberry Pi, and Other MCU's.
Few guidelines to use the sensor properly:
- Make sure the sensor is properly calibrated.
- Make sure the probe is dipped in deionized distilled water after each reading for at least a minute.
- Make sure the sensor is given at least a few minutes to settle down in its reading after dipping it in a solution.
Here is the link to the pH Sensor Blog for a detailed explanation.
Applications:
- Can be used to determine the PH level in the water
- Can be used for soil measurements in agriculture
- Can be used in Aquaculture
Pinout Of PH Probe Sensor:
Pinout Of PH Sensor
- TO – Temperature output
- DO – 3.3V Output (from ph limit pot)
- PO – PH analog output ==> Arduino A0
- Gnd – Gnd for PH probe (can come from Arduino GND pin) ==> Arduino GND
- Gnd – Gnd for the board (can also come from Arduino GND pin) ==> Arduino GND
- VCC – 5V DC (can come from Arduino 5V pin) ==> Arduino 5V pin
- POT 1 – Analog reading offset (Nearest to BNC connector)
- POT 2 – PH limit setting
Package Includes:
- 1 x pH Probe
- 1 x pH sensor board
Specifications:
| Operating voltage | 5±0.2V (AC - DC) |
| Working current | 5-10mA |
| The detection concentration range | PH0-14 |
| The detection range of temperature |
0-60 centigrade
|
| Response Time |
≤ 5S
|
| Stability time |
≤ 120S
|
| Power consumption |
≤ 0.5W
|
| Size |
42mm x 32mm x 20mm
|
| Weight |
25g
|
1. What is pH sensor used for?
- A pH sensor is one of the most essential tools that’s typically used for water measurements. This type of sensor is able to measure the amount of alkalinity and acidity in water and other solutions. When used correctly, pH sensors are able to ensure the safety and quality of a product and the processes that occur within a wastewater or manufacturing plant.
2. How to calibrate the pH sensor?
- The pH sensor can be calibrated by shorting the Vin and GND terminals at the probe side, thereby emulating a signal of pH 7. The onboard potentiometer near the BMC probe connector can then be adjusted to give an output of 2.5V between the Po and GND pin. Alternatively, you can also use analogRead() on the Arduino to calibrate it to 2.5V. For detailed instructions, please check out our pH sensor blog linked below.
