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Industrial Digital pH / ORP Sensor for Continuous Process Control
The Instrava pH / ORP sensor is designed for continuous, reliable measurement of acidity, alkalinity, and oxidation-reduction potential in industrial and environmental applications.
Built for long-term stability, the sensor integrates high-accuracy electrodes with digital RS485 (Modbus RTU) communication, ensuring strong anti-interference performance and seamless integration with PLC, DCS, and water quality analyzers.
It is widely used in water treatment, chemical processing, power generation, food & beverage, and environmental monitoring, where stable pH and ORP control is critical to process safety and efficiency.
Transmitters & Sensors Description
pH / ORP Sensor Key Features
High-precision pH & ORP measurement
Accurate monitoring across a wide pH and ORP range for demanding industrial processes.Digital RS485 Modbus RTU output
Stable long-distance transmission with no signal drift, ideal for harsh electrical environments.Industrial-grade electrode design
Fast response, strong resistance to contamination, and long service life.Low maintenance with optional automatic cleaning
Reduces manual intervention in wastewater and chemical applications.Wide compatibility
Fully compatible with Instrava multifunction water quality analyzers and third-party control systems.
pH/ORP Sensor Applications
Industrial water and wastewater treatment
Chemical and petrochemical processes
Power plant water systems
Environmental water monitoring
Food and beverage process water
General industrial online pH and ORP measurement
pH ORP Sensor Measurement Principle
pH Measurement
The pH sensor measures hydrogen ion activity using a glass electrode and reference electrode.
The potential difference generated between the electrodes varies proportionally with the pH value of the solution.
ORP Measurement
ORP measurement is based on detecting the oxidation or reduction potential of the solution.
The sensor outputs a millivolt (mV) signal representing the solution’s ability to gain or lose electrons.
Both signals are digitally processed and transmitted via RS485 for stable and accurate readings.
pH ORP Sensor Installation & Integration
Immersion, pipeline, or flow-cell installation
Plug-and-play with Instrava water quality analyzers
Compatible with PLC, SCADA, and DCS systems
Suitable for continuous online monitoring
Transmitters & Sensors Parameter
Technical Specifications – pH / ORP Sensor
| Parameter | pH Sensor | ORP Sensor |
|---|---|---|
| Measurement Range | 0 ~ 14 pH | -1999 mV ~ +1999 mV |
| Operating Temperature | 0 ~ 80 ℃ | -10 ~ 100 ℃ |
| Operating Pressure | ≤ 0.6 MPa | ≤ 0.8 MPa |
| Measurement Accuracy | pH: ±0.05 pH Temperature: ±0.5 ℃ | ORP: ±1 mV Temperature: ±0.5 ℃ |
| Temperature Sensor | NTC 2.252K | NTC 2.252K |
| Wetted Material | ABS, Glass | ABS, Glass |
| Protection Class | IP65 | IP65 |
| Sensor Dimensions | Ø26.7 × 160 mm Ø12 × 120 mm | Ø26.7 × 160 mm Ø12 × 120 mm |
| Process Connection | 3/4″ NPT, PG13.5 | 3/4″ NPT, PG13.5 |
| Signal Cable Length | 5 m standard Up to 20 m customizable | 5 m standard Up to 20 m customizable |
Instrava OEM/ODM
Reliable Instruments. Solutions That Fit Your Application.
Instrava is focused on delivering reliable industrial solutions through carefully curated products, application-driven optimization, and flexible customization. We select proven instruments from trusted manufacturers to ensure consistent quality, optimize solutions based on real working conditions to solve practical challenges, and provide tailored configurations to meet specific application needs.
By combining selection expertise with application understanding, Instrava helps customers reduce risk, improve efficiency, and achieve dependable results in complex industrial environments.
What is the typical service life of a pH or ORP electrode in industrial applications?
Under normal industrial water conditions, the typical service life of a pH or ORP electrode is 12–18 months. Actual lifespan depends on water quality, temperature, chemical composition, and maintenance practices.
How often should the pH ORP sensor be calibrated?
For stable industrial water, calibration is usually recommended once per month. In harsh or fluctuating process conditions, more frequent calibration (every 1–2 weeks) helps maintain measurement accuracy.
What factors most commonly reduce electrode lifespan on site?
Electrode lifespan can be shortened by high temperature, strong acids or alkalis, oil contamination, solids abrasion, and improper cleaning. Regular inspection and correct cleaning procedures significantly extend sensor life.
Can the pH ORP sensor be used directly in wastewater with suspended solids?
Yes. The sensor is suitable for wastewater applications; however, regular cleaning is recommended to prevent fouling on the glass membrane, which may affect response time and accuracy.
Is the sensor compatible with different transmitters or controllers?
The pH ORP sensor is compatible with most standard industrial pH/ORP transmitters and analyzers that support glass electrode inputs and NTC temperature compensation.
How can stable measurement be ensured in long-term online operation?
Stable long-term operation is achieved through proper installation, correct calibration, regular cleaning, and suitable electrode selection based on process conditions. Using compatible transmitters with temperature compensation further improves measurement stability.
Why Choose Instrava
Built on Consistency, Not Claims
Focused on Industrial Applications
We specialize in industrial analysis and detection, with a clear understanding of real-world operating environments and requirements.
Strict Product Selection Criteria
Every instrument is evaluated based on performance, stability, and application suitability—not just specifications or pricing.
Reliable Supply & Quality Consistency
We work with trusted manufacturers to ensure stable supply, consistent quality, and dependable delivery.
Practical, Experience-Based Support
Our recommendations are grounded in application understanding, helping customers avoid common issues and achieve reliable results.
Instrava is built to reduce uncertainty—so every decision you make is clearer, safer, and more reliable.
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