pH Sensor

  • Established on 5 continents
  • More than 20 sensors
  • Energy efficient digital sensors
  • Sensors compatible with our transmitters, portable devices, loggers

Elevate your water analysis with Aqualabo’s PHEHT probe. Engineered for the toughest conditions, it masters the measurement of pH, ORP, and temperature parameters. Its robust design thrives in environments ranging from crystal-clear waters with low conductivity to challenging wastewater with high conductivity. Our pH probe incorporates Plastogel® PONSEL technology, ensuring an extended sensor life without the need for refilling

French Design and Manufacture for more than 70 years
Technical Support and Internal Service
Global presence, network of distributors
ISO 9001 certified company

Digital sensor for extreme reliability of measurements

Our pH sensors can be integrated on any system offering an RS485 or SDI12 input and on our transmitters, portable equipment or datalogger.


pH and Temperature sensor

The PHEHT cutting-edge sensor excels in measuring pH, ORP, and temperature parameters. Engineered for challenging conditions, it boasts a long-life electrode, digital technology, and Modbus RS485 protocol for seamless integration.

Why measure pH and ORP in water?

Analysis of pH and ORP levels in water is pivotal for addressing various challenges. pH, indicating acidity or alkalinity, directly influences chemical reactions. Fluctuations can disrupt aquatic ecosystems, impact nutrient availability, and compromise industrial processes. ORP potential, reflecting the water’s oxidative state, is crucial for measuring the efficiency of wastewater treatment and influencing microbial activity. By monitoring these parameters with precision, our pH/ORP/Temperature probe aids in averting environmental imbalances, optimizing industrial processes, and ensuring water quality compliance. It’s an essential control parameter for proactive problem-solving and maintaining the delicate balance of aquatic systems.

Main applications of pH and ORP measurement in water

Aqualabo’s pH probe finds versatile applications crucial for water management across diverse settings. In environmental monitoring, it plays a pivotal role in safeguarding the health of rivers and lakes, ensuring that pH levels support aquatic life. In industrial processes, precise pH and ORP measurements are vital for optimizing chemical reactions, preventing corrosion, and maintaining efficient production. Wastewater treatment benefits from the sensor’s ability to gauge ORP potential, ensuring the effectiveness of treatment processes. Whether it’s ensuring compliance with regulatory standards or preserving the delicate balance of aquatic ecosystems, the pH/ORP probe delivers reliable insights for a range of applications.

Measurement principles of Aqualabo’s pH probe for water quality analysis

Our sensor uses advanced technology with a combined electrode of special glass and a reference of Ag / AgCl in a saturated KCl electrolyte in the form of a plasticized electrolyte “PLASTOGEL”® for pH and ORP measurements. A platinum-tipped electrode provides ORP measurements, while an NTC sensor provides accurate temperature readings for reliable data. The electrolyte communicates directly with the external environment without any capillary or porous intermediary, so there is no risk of clogging or defusing the reference.

Why use and trust Aqualabo’s pH and ORP probe?

Our probe is characterized by its robust design. Highly resistant materials of construction combined with a reliable measurement principle make it the best choice for both spot and on-line applications. The open and universal Modbus RS-485 communication allows seamless integration with third party equipment, while the built-in transmitter ensures interference-free measurement and allows temperature compensation inside the sensor. Easy to use and maintain, the replaceable combined electrode cartridge keeps your probe running easily and cost effectively. Rely on PHEHT for high-performance pH and ORP monitoring and optimum process control in water treatment.


FAQ pH Sensor

Absolutely. Engineered for handheld and in situ use, the pH/ORP probe excels in challenging conditions, offering quick response, minimal flow dependence, and low power consumption.

Cleansing is performed by immersing the electrode in a special cleaning solution. The electrode must be kept clean, and the calibration checked regularly and adjusted over time. When the electrolyte is depleted (typically in 12 to 18 months), simply swap the replaceable cartridge with a new one and you are good to go!

Yes, the probe uses the open and universal Modbus RS485 protocol, allowing easy connectivity with a range of devices, including dataloggers, controllers, PLCs, and remote systems.

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