Labman
Online Conductivity Controller OCM21 (4–20mA Output, RS485 Communication)
Online Conductivity Controller OCM21 (4–20mA Output, RS485 Communication)
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Online Conductivity Controller OCM21 is designed for continuous conductivity and TDS monitoring in industrial water treatment, environmental systems, and process control applications. The controller delivers stable online measurement performance with integrated communication and signal output capability for automated monitoring systems.
The instrument supports conductivity and TDS measurement across a wide measuring range with selectable cell constants, temperature coefficients, and TDS conversion factors for flexible application use. Automatic temperature compensation ensures accurate readings under varying process conditions.
OCM21 features 1 to 3-point calibration with automatic recognition of conductivity standards, simplifying setup and calibration procedures while maintaining measurement reliability. Adjustable alarm settings and hysteresis control improve process monitoring and operational safety in industrial environments.
The controller provides 4–20mA analog output and RS485 communication interface for integration with PLC, SCADA, and industrial automation systems. Its compact panel-mount design with LCD display allows easy operation and real-time monitoring in water quality applications.
With conductivity, TDS, and temperature monitoring capability, OCM21 is suitable for industrial water treatment, cooling towers, boiler systems, wastewater monitoring, aquaculture, chemical processing, and laboratory automation applications.
Key Features
Continuous online conductivity and TDS monitoring
Wide auto-ranging conductivity measurement
1 to 3-point conductivity calibration
Automatic conductivity standard recognition
Selectable cell constant and TDS conversion factor
Automatic temperature compensation
4–20mA analog signal output
RS485 communication interface
Configurable high and low alarm limits
Compact panel-mount controller design
Suitable for industrial automation systems
Integrated conductivity and TDS monitoring
Technical Specifications
| Parameter | Specification |
|---|---|
| Conductivity Range | 0.01 to 20.00, 200.0, 2000 µS/cm, 20.00, 200.0 mS/cm |
| Conductivity Resolution & Accuracy | 0.001, 0.01, 0.1, 1, Accuracy ±1% F.S. |
| Calibration | 1 to 3 Points (10 µS / 84 µS / 1413 µS / 12.88 mS / 111.8 mS) |
| TDS Range | 0 to 10.00, 100.0, 1000 ppm, 10.00, 200.0 ppt |
| TDS Resolution & Accuracy | 0.01, 0.1, 1, Accuracy ±1% F.S. |
| TDS Conversion Factor | 0.1 to 1.0 (Default 0.5) |
| Temperature Range | 0 to 100°C / 32 to 212°F |
| Temperature Resolution & Accuracy | 0.1°C/°F, Accuracy ±1°C / ±1.8°F |
| Temperature Coefficient | 0.0 to 10.0%/°C |
| Offset Calibration | 1 Point, Reading ±10°C |
| Signal Output | 4–20 mA |
| Load | Maximum 500 Ω |
| High/Low Limit Alarm | 0.02 µS/cm to 20.0 mS/cm (Selectable) |
| Communication Interface | RS485 |
| Power Supply | DC 24V |
| Dimensions (L×W×H) | 290 × 230 × 155 mm |
| Weight | 1 kg |
Applications
Industrial water treatment systems
Cooling tower monitoring
Boiler water conductivity control
Wastewater treatment plants
Aquaculture and hydroponics
Chemical process industries
Online TDS and conductivity monitoring
