DFRobot Gravity 7/24 Industrial Analog pH Sensor Meter Kit for Arduino

DFRobot Gravity 7/24 Industrial Analog pH Sensor Meter Kit Technical Information

Overview

The DFRobot Gravity 7/24 Industrial Analog pH Sensor Meter Kit is a professional-grade analog pH measurement system designed for continuous (24/7) liquid monitoring.

• Measures:

  • pH level (acidity/alkalinity)

   

• Range:

  • 0 to 14 pH

   

• Output:

  • Analog voltage (linear)

   

• Designed for:

  • Long-term industrial and environmental monitoring

   

It combines an industrial glass electrode + signal conditioning circuit.

Working Principle

Electrochemical pH Measurement

1. Glass Electne electrode

When immersed in liquid:

• Hydrogen ion concentration (H) creates a potential difference

2. Reference Electrode System

• Uses Ag/AgCl reference electrode with electrolyte (KCl solution)

• Provides a stable reference voltage

3. Voltage Generation

• pH value produces a small voltage:

  • Acidic higher positive potential

  • Alkaline lower potential

   

4. Signal Conditioning

• Internal circuit amplifies and converts signal linear analog output

Output voltage corresponds directly to pH value (014)

Measurement Characteristics

• pH Range: 0 14 pH

• 1 minute

• Output: Linear analog voltage

Stability Features

• Good reproducibility

• Low drift

• Excellent thermal stability

Electrical Characteristics

• Supply voltage: 5V

• Output type: Analog (to ADC/microcontroller)

• Low noise signal conditioning

Interface & Connectivity

• BNC connector pH probe connection

• PH2.0 connector analog output interface

• Compatible with:

  • Microcontrollers (ADC input required)

   

Plug-and-play style connection system.

Internal Features

Industrial Glass Electrode

• Low impedance glass membrane

• Fast /ul

  Anti-Pollution Design

  • PTFE ring membrane:

    • Prevents clogging

    • Suitable for long-term use

     

  Stable Reference System

  • Ag/AgCl electrolyte bridge ensures:

    • Stable voltage

    • Reliable readings

     

  Gain Adjustment

  • Onboard potentiometer:

    • Used for calibration tuning

     

  Power Indicator

  • LED indicates module operation

  Operating Behavior

  Continuous Monitoring (7/24)

  • Designed for long-term online measurement

  • Electrode lifespan:

    • ~1 year (typical)

     

   

  Calibration Requirement

  • Requires two-point calibration:

    • Typically using buffer s

    • pH 7.0

     

   

Analog Output Processing

• Requires:

  • ADC conversion

  • Software mapping to pH value

   

Environmental Characteristics

• Operating temperature:

  • 0C to 60C

   

Suitable Liquids

• Water

• Aqueous solutions

• Non-corrosive liquids

Limitations

• Requires:

  • Regular calibration

   

• Electrode:

  • Must be kept moist (KCl solution)

   

• Sensitive to:

  • Temperature variation

  • Contamination

   

• Analog output:

  • Needs proper filtering and ADC for accuracy

   

Typical Pin Configuration

• trong>GND Ground

• AOUT Analog pH signal

Functional Role

The kit acts as a:

• pH measurement system

• Liquid quality monitoring sensor

• Industrial chemical sensing device

Summary

The DFRobot Gravity 7/24 Industrial pH Sensor Kit is a high-reliability pH sensing solution that:

• Uses glass electrode electrochemical sensing

• Measures full pH range (014)

• Provides linear analog output

• Supports continuous 24/7 monitoring

• Offers high accuracy (0.1 pH)