Gravity: Analog pH Sensor/Meter Kit V2 Overview

With this product, the main control board (such as Arduino), and the software library, you can quickly build the pH meter, plug, and play, no welding. DFRobot provides a variety of water quality ph analog 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.

The pH is a value that measures the acidity or alkalinity of the solution. It is also called the hydrogen ion concentration index. The pH is a scale of hydrogen ion activity in solution. The pH has a wide range of uses in medicine, chemistry, and agriculture. Usually, the pH is a number between 0 to 14. Under the thermodynamic standard conditions, pH=7, which means the solution is neutral; pH<7, which means the solution is acidic; pH>7, which means the solution is alkaline.

Calibrating an Analog pH Sensor (with Linear Algebra)

How to measure and indicate the pH of liquids with Arduino and LCD

   Attention：
1. The BNC connector and the signal conversion board must be kept dry and clean, otherwise, it will affect the input impedance, resulting in an inaccurate measurement. If it is damp, it needs to be dried.
2. The signal conversion board cannot be directly placed on a wet or semiconductor surface, otherwise, it will affect the input impedance, resulting in the inaccurate measurement. It is recommended to use the nylon pillar to fix the signal conversion board, allow a certain distance between the signal conversion board and the surface.
3. The sensitive glass bubble in the head of the pH probe should avoid touching with the hard material. Any damage or scratches will cause the electrode to fail.
4. After completing the measurement, disconnect the pH probe from the signal conversion board. The ph analog sensor probe should not be connected to the signal conversion board without the power supply for a long time.

• 3.3~5.5V wide voltage input
• Hardware filtered output signal, low jitter
• Gravity connector and BNC connector, plug and play, no welding
• Software library supports two-point calibration and automatically identifies standard buffer solution
• Uniform size and connector, convenient for the design of mechanical structures

Gravity: Analog pH Sensor/Meter Kit V2 TECH SPECS

• Supply Voltage: 3.3~5.5V
• Output Voltage: 0~3.0V
• Probe Connector: BNC
• Signal Connector: PH2.0-3P
• Measurement Accuracy: ±0.1@25℃
• Dimension: 42mm*32mm/1.66*1.26in

• Probe Type: Laboratory Grade
• Detection Range: 0~14
• Temperature Range: 5~60°C
• Zero Point: 7±0.5
• Response Time: <2min
• Internal Resistance: <250MΩ
• Probe Life: >0.5 years (depending on the frequency of use)
• Cable Length: 100cm

• pH Probe(Laboratory Grade)  x1
• pH Signal Conversion Board x1
• Gravity Analog Sensor Cable x1
• pH Standard Buffer Solution 4.0 x2
• pH Standard Buffer Solution 7.0 x2
• Waterproof Gasket x2
• Screw Cap for BNC Connector x1
• M3 * 10 nylon pillar x4
• M3 * 5 screws x8