This Online pH Controller is an industrial water quality monitoring and control device, used for continuous real-time detection of pH, ORP and water temperature.It matches various online pH/ORP sensors, features high measurement accuracy, stable performance, automatic calibration and strong anti-interference.
Equipped with RS485 Modbus-RTU, 4-20mA analog output and relay control output, it can automatically control dosing pumps and dosing valves.Widely applied in wastewater treatment, drinking water, aquaculture, chemical industry, electroplating, circulating water and environmental water quality monitoring.
Online pH Controller Main Function
- Real-time pH & ORP continuous monitoring
- High & low limit alarm, automatic dosing control
- Digital temperature compensation
- Data lock, one-point / two-point calibration
- RS485 Modbus RTU / analog signal output
- Waterproof dustproof industrial grade housing
Key Advantages
- Dual pH/ORP integrated monitoring
- Automatic dosing control and high/low limit alarm
- Standard RS485 remote transmission, easy IoT connection
- Isolated 4-20mA output, compatible with PLC/DCS
- Industrial anti-interference design, suitable for harsh site
- One-key calibration, easy operation and maintenance
SEO Keywords
Online pH Controller, pH ORP Controller, Industrial pH Meter, Water Quality pH Monitor, Automatic Dosing Controller, RS485 pH Controller, Online ORP Analyzer.
Technical Parameters
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Parameter |
Specification |
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Measurement Range |
0–14 pH |
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Temperature Range |
0–100°C |
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Pressure Range |
0–3 Bar, 6 Bar MAX |
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Temperature Compensation |
NTC2.252K, NTC5K, NTC10K, NTC22K, NTC30K, PT100, PT1000 (optional) |
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Factory Slope |
Better than 95% |
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Membrane Resistance |
< 250 MΩ |
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Zero Potential |
< ±10 mV |
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Response Time |
< 10 s |
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Salt Bridge Type |
Special porous ceramic core |
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Reference Electrolyte |
PCG polymer gel (standard type) |
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Reference Type |
Double salt bridge reference |
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Installation Thread |
Upper/lower 3/4 NPT pipe thread |
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Housing Material |
Polytetrafluoroethylene (PTFE) |
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Length |
140 mm |
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pH Sensitive Membrane |
Acid/alkali-resistant sensitive membrane (HA) |
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Cable Connection |
Integrated direct-connection type |
Technical Specifications
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Parameter |
Specification
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Measurement Parameters |
pH, ORP, Temperature |
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pH Range |
-2.00 to 16.00 pH |
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ORP Range |
-1999 to 1999 mV |
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Temperature Range |
-30.0 to 130.0°C |
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Resolution |
pH: 0.01, ORP: 1 mV, Temp: 0.1°C |
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Accuracy |
pH: ±0.01 ±1 Digit, ORP: ±0.1% ±1 Digit, Temp: ±0.2°C ±1 Digit |
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Temperature Compensation |
NTC22K / PT1000 / PT100 / Manual Mode |
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Calibration |
Single-point, Two-point, or Three-point |
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Input Impedance |
> 10¹² Ω |
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Current Outputs |
2× Isolated 4–20mA (Max load: 500Ω each) |
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Relay Output |
240VAC 3A (ON/OFF control) |
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Display |
LCD (240×160 or 256×128 dot matrix) |
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Operating Temp. |
0 to 50°C |
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Storage Temp. |
-10 to 70°C |
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Power Supply |
100–240VAC ±10%, 50/60Hz, 5W |
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Installation |
Wall-mounted / Pipe-mounted / Panel-mounted |
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Dimensions (H×W×D) |
96 × 96 × 125 mm |
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Panel Cutout Size |
93 × 93 mm |
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Weight |
0.8 kg |
Application Fields
Municipal wastewater treatment plants
Industrial circulating cooling water system
Aquaculture water quality management
Chemical, electroplating and pharmaceutical water
Swimming pool & drinking water disinfection system
Environmental online monitoring stations
Product Application
