PH4502C Liquid pH Value Detection Sensor Module

PH4502C Liquid pH Value Detection Sensor Module

The PH4502C is an affordable analog pH sensor module designed for measuring the pH value of liquids (acidity or alkalinity) in the range of 0-14. It features a BNC connector for the pH electrode probe and screw terminals for easy connection to microcontrollers like Arduino or ESP32. The module includes onboard potentiometers for calibration (offset adjustment for pH 7 and limit setting), a digital output (DO) for threshold alerting, and an analog output (PO) for precise voltage readings that can be converted to pH values. It is widely used in DIY projects for water quality monitoring, hydroponics, aquaculture, environmental testing, and educational purposes. The module requires two-point or three-point calibration using standard buffer solutions (e.g., pH 4.00, 7.00, 10.00) for accurate results. Note: The electrode probe needs proper storage in solution and periodic recalibration for longevity.

Key Features:

• Analog voltage output for continuous pH monitoring.
• Adjustable calibration via onboard potentiometers.
• Digital threshold output (DO) for high/low pH alerts.
• BNC connector for replaceable pH electrode.
• Compatible with Arduino, Raspberry Pi (with ADC), and other MCUs.
• Compact design with mounting holes.

Specifications:

• Measuring range: pH 0-14
• Operating voltage: 5V ± 0.2V DC
• Working current: 5-10 mA
• Response time: ≤ 5 seconds
• Stabilization time: ≤ 60 seconds
• Power consumption: ≤ 0.5 W
• Operating temperature: -10°C to 50°C (nominal 20°C)
• Probe temperature range: 0-80°C  
• Working humidity: ≤ 95% RH
• Module dimensions: 42 mm × 32 mm × 20 mm
• Weight: Approx. 25 g
• Output: Analog voltage (PO), Digital (DO)
• Service life: Approx. 3 years (with proper care)

Note: Accuracy depends on proper calibration; the probe is sensitive and should be stored in KCl solution when not in use.

What is included:
1x PH4502C module (the pH probe is not included)
4x screws