RS485 4-20mA Digital pH Sensor with 2-12 pH Range and 0-80°C Temperature for Water Quality Monitoring

This digital pH sensor is engineered for general industrial processes and agricultural water-fertilizer machinery systems. Featuring a double salt bridge design and dual-layer permeable interface, it effectively resists medium backflow. The ceramic porous electrode exudation interface minimizes clogging, while the PTFE large-ring diaphragm ensures long-term electrode durability for reliable water quality monitoring.

• Spherical sensing bulb: Enlarged sensitive area for faster response and stable signal output
• PA+GF housing: Withstands high temperatures from 0-60°C
• Quad-core shielded cable: High-quality dedicated wiring ensures precise signal transmission
• Dual salt bridge system: Enhanced resistance to medium backflow
• Ceramic sand core liquid junction: Reduced clogging for consistent performance

The pH electrode operates on the Nernst equation principle, utilizing a galvanic cell system that converts chemical reaction energy into electrical energy. This system consists of two half-cells: a measuring sensor with potential related to specific ion activity, and a reference sensor connected to the measurement solution and instrument.

Before use, unscrew the electrode protective cap and install with appropriate mounting brackets or accessories.

• Sidewall Installation: Ensure interface tilt angle exceeds 15 degrees
• Top Flange Installation: Note flange dimensions and electrode insertion depth
• Pipe Installation: Consider pipe diameter, flow velocity, and pressure
• Flow-Through Installation: Monitor flow velocity and pressure parameters
• Submersion Installation: Adjust bracket length as required for application

• Before use, unscrew protective cap and immerse electrode bulb and liquid junction in sample
• Rinse with water if salt crystals form near electrode tip
• Check for air bubbles in glass bulb by shaking electrode vertically
• Keep glass membrane hydrated for fast response - rinse thoroughly after measurement
• Add storage solution (3 mol/L KCl) to protective cap after calibration
• Ensure terminal connections remain dry; clean with anhydrous alcohol if contaminated
• Avoid prolonged immersion in distilled water, protein solutions, or contact with silicone grease
• For aged electrodes with cloudy membranes, soak in 10% HCl then rinse thoroughly
• Regularly clean and calibrate electrode; replace if calibration fails after maintenance

With proper maintenance, electrodes typically last over 12 months under normal conditions. Unused electrodes have a shelf life of 12-24 months when stored correctly. Exposure to strong acids, bases, high temperatures, or corrosive liquids may shorten lifespan. Note that electrodes are consumables and generally not covered by warranty.

• Use fresh pH/ORP standard buffer solutions of appropriate concentrations
• Remove protective cap and rinse electrode with distilled water
• Set instrument to calibration mode (refer to instrument manual)
• After calibration, proceed with actual sample measurements