How It Works: Electrochemical pH Detection

The SS316L pH sensor operates based on the electrochemical principle, utilizing a glass pH electrode and a reference electrode to measure hydrogen ion (H⁺) activity in water.

1. pH-Sensitive Glass Membrane – Reacts with H⁺ ions, generating a small voltage.

2. Reference Electrode – Provides a stable potential for comparison.

3. NTC Temperature Sensor – Compensates for temperature variations to ensure accuracy.

4. Signal Conversion – The voltage difference is converted into a 4-20mA or digital (RS-485) output for easy integration with controllers and data loggers.

The Modbus/RTU protocol allows seamless communication with SCADA, PLC, or IoT systems, enabling remote monitoring and control.

How to Measure pH with This Sensor?

1. Calibration (Required for Accuracy)

• Use pH 4.0 and pH 7.0 (or pH 10.0) buffer solutions.

• Immerse the sensor in each buffer and adjust readings via the connected controller.

2. Measurement Process

• Installation: Mount the sensor using the 3/4" NPT threaded connection (immersion or flow-cell setup).

• Stabilization: Allow 1-2 minutes for the reading to stabilize.

• Data Collection: The sensor transmits real-time pH data via 4-20mA or RS-485.

3. Maintenance

• Rinse with distilled water after use.

• Store in pH 4.0 or KCl storage solution to prolong electrode life.