ORP-100 Digital ORP Probe

Overview

The ORP-100 is an advanced digital ORP (Oxidation-Reduction Potential) electrode designed for general environmental applications including water treatment, aquaculture, swimming pools, and industrial process monitoring. This intelligent probe features built-in digital processing for superior accuracy, stability, and noise immunity compared to traditional analog ORP sensors.

Key Features

• Digital Technology: Superior accuracy and stability with digital signal processing
• Dual Output Options: Supports both RS485 Modbus RTU and 4-20mA current output
• Wide Measurement Range: -2000 to +2000 mV for comprehensive redox monitoring
• Wide Temperature Range: Operates from -10.0 to 130.0°C
• Automatic Temperature Compensation: Integrated PT1000 sensor for precise measurements
• Direct Connection: Connect directly to computer or PLC without additional instrumentation
• Industrial Grade Construction: ABS exterior with NPT 3/4” thread for robust installation
• High Protection: IP68 waterproof rating ensures reliable operation

Applications

• Swimming pool and spa disinfection monitoring
• Drinking water treatment plants
• Wastewater treatment facilities
• Aquaculture and fish farming
• Cooling tower water treatment
• Industrial process water monitoring
• Environmental water quality assessment
• Disinfection system optimization
• Chemical dosing control

Technical Specifications

The ORP-100 delivers exceptional accuracy with ±1 mV precision across the full -2000 to 2000 mV range. The integrated PT1000 temperature sensor provides automatic temperature compensation with ±0.3°C accuracy from -10.0 to 130.0°C, ensuring reliable measurements in varying environmental conditions.

Digital signal processing eliminates noise and interference common in industrial environments, providing stable and reliable ORP measurements even in electrically noisy conditions with pumps, motors, and controllers nearby.

Connectivity and Integration

With its RS485 Modbus RTU interface, the ORP-100 seamlessly integrates into modern SCADA systems, IoT networks, and industrial automation platforms. The 4-20mA current output option ensures backward compatibility with traditional industrial controllers, PLCs, and chemical dosing systems.

The probe operates on 9-24V DC power supply, making it compatible with standard industrial power systems.

Installation Notes

The NPT 3/4” threaded design provides secure installation in tanks, pipes, and process equipment. The larger Φ28mm diameter accommodates the digital electronics while maintaining a compact profile. The 5-wire/BNC connection ensures secure signal transmission and reliable operation.

Understanding ORP in Water Treatment

ORP (Oxidation-Reduction Potential) is a critical parameter for:

• Disinfection Control: Positive ORP values (typically 650-750 mV) indicate effective chlorine disinfection in pools and drinking water
• Water Quality: Monitoring oxidizing vs. reducing conditions in water bodies
• Chemical Process Control: Optimizing chemical dosing in treatment processes
• Safety Monitoring: Detecting changes in water chemistry that may affect water quality

Advantages of Digital Technology

Unlike analog ORP sensors, the ORP-100’s digital design offers:

• Superior noise immunity in electrically harsh environments
• Enhanced long-term stability and minimal calibration drift
• More accurate temperature compensation
• Simplified installation with reduced wiring complexity
• Better repeatability and precision
• Real-time diagnostics and status reporting

Maintenance and Calibration

The digital design reduces maintenance requirements through enhanced stability and self-diagnostics. The probe can be easily calibrated using standard ORP reference solutions (typically 220 mV and 470 mV buffers).