pH Sensor

KH.SZ-PHG Industrial Online pH Sensor for Water Quality Monitoring with RS-485 Modbus RTU

Product Introduction

The KH.SZ-PHG Industrial Online pH Sensor is a high-precision digital pH meter designed for continuous monitoring of water quality in environmental, industrial, and chemical process applications. Utilizing the glass electrode method combined with a single-chip microcomputer digital circuit, the sensor provides accurate pH readings with automatic temperature compensation. The sensor’s robust IP68-rated design allows submersion up to 60 meters, making it ideal for rivers, reservoirs, chemical tanks, and wastewater monitoring systems. Real-time pH data can be transmitted via RS-485 Modbus RTU for seamless integration with PLC, DCS, industrial controllers, or SCADA systems.

Key Features
• High-precision measurement: Glass electrode method ensures accurate pH readings across the full 0–14 pH range.
• Automatic temperature compensation: Maintains accuracy between 0–60°C for stable and reliable results.
• Fast response: Sensor reaches stable readings within 30 seconds.
• Excellent repeatability and low drift: pH drift ±0.1 pH, resolution 0.01 pH.
• Long-term reliability: MTBF ≥720 hours per cycle; calibration interval up to 6 months.
• Durable and waterproof: IP68-rated, suitable for immersion up to 60 meters.
• Easy integration: RS-485 Modbus RTU output compatible with PLC, DCS, SCADA, and industrial monitoring systems.

Application Scenarios
• Environmental water quality monitoring in rivers, lakes, and reservoirs
• Industrial process control in chemical, pharmaceutical, and food production
• pH measurement in acid, alkaline, and salt solutions
• Water treatment plants and wastewater monitoring
• Laboratory and tank monitoring for industrial operations

Technical Specifications

Parameter	Specification
Measurement Method	Glass Electrode Method
pH Range	0–14 pH, adjustable
Accuracy	±0.1 pH
Repeatability	≤0.1 pH
Resolution	0.01 pH
pH Drift (pH=4,7,9)	±0.1 pH
Temperature Compensation	Automatic, 0–60°C, ±0.1 pH
Response Time	<30 s
MTBF	≥720 hours per cycle
Voltage Stability	±0.1 pH variation in reading
Calibration Cycle	6 months
Protection Rating	IP68, submersion up to 60 meters
Communication Interface	RS-485 (Modbus RTU)
Power Supply	12–24 V DC
Housing Material	ABS/PC Alloy
Installation	Submersible, 3/4 NPT
Cable Length	Standard 5 m, customizable