Labman
Online pH Controller OPH11 (4–20mA Output, RS485 Communication)
Online pH Controller OPH11 (4–20mA Output, RS485 Communication)
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Online pH Controller OPH11 is designed for continuous pH monitoring and process control in industrial, environmental, and water treatment applications. The controller combines accurate pH measurement with reliable signal output and communication capability for real-time monitoring systems.
The instrument supports pH, mV, and temperature measurement with automatic temperature compensation to ensure stable and accurate readings across varying process conditions. It offers 1 to 3-point calibration with auto-buffer recognition using USA and NIST buffer standards for simplified setup and reliable calibration performance.
OPH11 includes a built-in electrode diagnosis function that helps users evaluate sensor condition and determine when probe replacement is required. Adjustable alarm settings and hysteresis control improve operational safety and process management in industrial environments.
The controller provides 4–20mA analog signal output and RS485 communication interface for integration with PLC systems, SCADA platforms, and industrial automation networks. Detachable screw terminal connections simplify installation and maintenance.
Its compact panel-mount design with LCD display allows easy operation and continuous monitoring in laboratories, water treatment systems, chemical plants, aquaculture, and industrial process applications.
Key Features
Continuous online pH monitoring and control
pH, mV, and temperature measurement
1 to 3-point calibration with auto-buffer recognition
Supports USA and NIST buffer standards
Automatic temperature compensation
Electrode diagnosis function
4–20mA analog signal output
RS485 communication interface
Configurable low and high alarm settings
Detachable screw terminal connections
Compact panel-mount design
Suitable for industrial automation systems
Technical Specifications
| Parameter | Specification |
|---|---|
| pH Range | -1.00 to 15.00 pH |
| pH Resolution | 0.01 pH |
| pH Accuracy | ±0.01 pH |
| Calibration Points | 1 to 3 Points |
| pH Buffer Options | USA (4.01/7.00/10.01) or NIST (4.01/6.86/9.18) |
| mV Range | ±1000 mV |
| mV Resolution | 1 mV |
| mV Accuracy | ±1 mV |
| Temperature Range | 0 to 100°C |
| Temperature Resolution | 0.1°C |
| Temperature Accuracy | ±1°C |
| Signal Output | 4–20 mA |
| Low / High Alarm | 0.00 to 14.00 pH (Selectable) |
| Communication Interface | RS485 |
| Connection Terminals | Detachable Screw Terminals |
| Temperature Compensation | 0 to 100°C, Automatic |
| Environmental Conditions | Ambient Temperature <50°C, Relative Humidity <70% |
| Power Supply | DC 24V |
| Dimensions (L×W×H) | 260 × 200 × 110 mm |
| Weight | 1 kg |
Applications
Industrial process pH monitoring
Water and wastewater treatment plants
Chemical processing industries
Aquaculture systems
Environmental monitoring
Food and beverage processing
Laboratory automation systems
