Product Introduction
Online pH monitoring sensor for membrane separation produced water, ultra-high precision, RS485 communication
I. Product overview of the online pH monitoring sensor for membrane separation produced water, ultra-high precision, RS485 communication
High Precision pH The sensor adoptsComposite glass electrode principle(indicating electrode + Ag/AgCl Reference electrode+ built-in temperature compensation), follows the Nernst equation, collects the hydrogen ion activity of the solution in real time, and has a built-in microprocessor that directly digitizes the signal, achieving high-precision, stable and continuous online pH monitoring. The product integrates automatic temperature compensation (ATC), greatly eliminating measurement deviation caused by temperature, supporting long-term immersion installation, suitable for industrial processes, environmental water quality, food and pharmaceuticals, etc.pH scenarios with strict accuracy requirements, can be directly connected toPLC、DCS、data acquisition terminal, is the core sensing unit for automated water quality control.
II. Working principle of the online pH monitoring sensor for membrane separation produced water, ultra-high precision, RS485 communication
When the sensitive glass membrane contacts the solution to be measured, the hydrogen ion concentration difference on both sides of the membrane generates a potential difference; the reference electrode provides a stable reference potential; built-in NTC/PT1000 The temperature element synchronously collects liquid temperature, and the algorithm automatically compensates for temperature drift, converting the potential signal into standardpH value; digital probe completes signal conversion locally, reducing electromagnetic interference in long-line transmission.
III. Core features of the online pH monitoring sensor for membrane separation produced water, ultra-high precision, RS485 communication
- High measurement accuracy：Range 0~14pH，Accuracy ±0.02pH，分辨率0.01pHgood repeatability, suitable for precision process control and laboratory-grade online monitoring
- Automatic temperature compensation ATC：Built-in temperature sensing, full-temperature-range correction, stable data under high and low temperature conditions
- Excellent anti-interference：Built-in high-impedance amplifier circuit, digital RS485 Modbus-RTU output, strong anti-electromagnetic interference, signal does not attenuate over long-distance transmission; some models have electrical isolation
- Corrosion-resistant structure：PPS Engineering plastic housing,PTFE Porous liquid junction, not easy to clog, resistant to weak acids and weak bases; optional sanitary-grade and special anti-corrosion electrodes
- Intelligent storage：Onboard memory, saves calibration parameters, not lost after power failure; supports reading electrode diagnostic information (slope, zero point, contamination status)
- Easy installation: Standard G3/4 orNPT3/4 Threaded, supports multiple installation methods such as flow cell, immersion, and pipe insertion; protection ratingIP68can be used immersed in water for a long time
- Technical parameters
| Item |
Parameter |
| Measurement Range |
0 ~ 14 pH |
| Measurement accuracy |
±0.02 pH（25℃） |
| 分辨率 |
0.01 pH |
| Temperature range |
0 ~ 60℃ (optional high-temperature model) |
| Temperature Accuracy |
±0.3℃ |
| Power supply |
5~24VDC |
| 信号输出 |
RS485 Modbus-RTU / 4-20mA analog optional |
| Housing material |
PPS (optional 316L stainless steel) |
| Liquid junction |
PTFE porous diaphragm |
| Withstand Pressure |
≤3bar |
| 防护等级 |
IP68 |
| Response time |
≤10s (95% stable value) |
V.Application fields
Environmental protection industry：Sewage plant inlet and outlet water, surface water, river water quality, discharge outlet online monitoring ✅
Water treatment：Pure water / Ultrapure water, circulating cooling water, reverse osmosis processpH Precision control✅
Chemical metallurgy：Reactor pH monitoring, acid-base neutralization process ✅
Food and pharmaceuticals：Beverages, fermentation, biopharmaceuticals, sanitary processes pH monitoring (sanitary electrode)✅
Aquaculture：Aquaculture water pH Real-time monitoring✅
Laboratories, scientific research equipment, water quality online monitoring stations
Six,Usage and maintenance tips
- Factory pre-calibrated; before on-site use, it is recommended to use standard buffer solution (4.01、6.86、9.18) two-point calibration
- The glass sensitive membrane must not be stored dry; for long-term disuse, it must be soaked in protective solution
- For sewage and high-turbidity conditions, regularly clean the diaphragm to prevent drift caused by scaling and clogging
- Avoid prolonged immersion of the glass bulb in strong hydrofluoric acid or high-concentration strong alkali
Main Application Areas
- Membrane Separation Produced Water — Continuous pH monitoring of permeate and concentrate streams in reverse osmosis, nanofiltration, and ultrafiltration systems to ensure process efficiency and water quality.
- Industrial Wastewater Treatment — Real-time pH control in neutralization, precipitation, and biological treatment stages to meet discharge regulations and optimize chemical dosing.
- Power Plant Water Chemistry — Monitoring pH in boiler feedwater, condensate, and cooling water to prevent corrosion and scaling in high-purity water systems.
- Pharmaceutical and Biotechnology — pH measurement in purified water production, fermentation, and separation processes where precision and hygiene are critical.
- Food and Beverage Processing — pH monitoring in membrane filtration for juice, dairy, and beverage production to maintain product consistency and safety.
Keywords：online pH sensor, RS485 pH probe, membrane separation pH monitoring, ultra high precision pH sensor, industrial pH electrode, water quality pH meter, digital pH transmitter, pH sensor for water treatment
