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About pH

pH, commonly used for water measurements, is a measure of acidity and alkalinity, or the caustic and base present in a given solution. It is generally expressed with a numeric scale ranging from 0-14. The value 7 represents neutrality. The numbers on the scale increase with increasing alkalinity, while the numbers on the scale decrease with increasing acidity.

Each unit of change represents a tenfold change in acidity or alkalinity. The pH value is also equal to the negative logarithm of the hydrogen-ion concentration or hydrogen-ion activity. pH values for some common solutions are listed in the table to the right.

pH sensors are essential instruments used across various industries and research fields to measure the acidity or alkalinity of solutions. These sensors employ different technologies, such as glass electrodes and reference electrodes, to detect the concentration of hydrogen ions in a solution, which determines its pH value. Whether in laboratory settings or industrial processes, pH sensors enable precise monitoring and control, ensuring product quality, environmental safety, and regulatory compliance. With their ability to provide real-time data and withstand challenging conditions, pH sensors play a critical role in numerous applications, from chemical manufacturing and water treatment to food production and environmental monitoring.

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How Are pH Measurements Used?

pH measurements are widely used to control processes, ensure product quality and safety.

pH neutralization of effluent in industrial manufacturing environments

Cooling tower and boiler control

Environmental monitoring

Odor scrubbers

Food and beverage quality control and safety

Upstream protection of filtration membranes

Water pre-treatment for manufacturing processes

Swimming pool control

Pulp and paper manufacturing

Pharmaceutical research & development and manufacturing

Blood-gas analysis in medical devices

Custom pH Sensor Design and Manufacturing

In addition to our standard products, Sensorex designs and manufactures pH sensors for over 250 OEM partners. Whether you are looking to private label sensors and instrumentation or incorporate pH sensors as part of the design for your water treatment product, our team of engineers and application specialists can help you meet your goals. We provide custom branding on our standard products and can design custom pH sensors to meet various design specifications.

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pH Sensors

Our extensive line of pH products provide options for almost any application.

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Popular ProductsSensorex pH Best Sellers

S8300 – Modular pH Sensors for In-line

In heavily contaminated wastewater or chemical processing applications, an inline pH probe typically wears out fast. Constantly replacing an inline pH…

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Complete Modular Submersion/Inline* pH Smart Sensors

Sensorex 8000 series Smart Sensors can be configured in countless variations to meet our exact needs. This is one of…

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S272CD – Process pH Sensor

The S272CD online process pH sensor delivers reliable online monitoring for in-line or submersion installation configuration. This sensor is designed…

Add to Cart | $214.80

TX2000 – Intelligent pH & ORP Transmitter/Controller

Our TX2000 is an intelligent pH and ORP transmitter/controller for reading pH and ORP sensors and programmable process controls. The large…

Add to Cart | $1,083.64

S175CD/BNC – pH Sensor, Spear Tip

Looking to measure the pH of substrate, soil, meat, or cheese? A standard pH sensor with bulb shaped glass won't…

Add to Cart | $159.83

SG354/SG355 Glass-Body Flat Surface pH and ORP Electrodes

SG354/SG355 sensors feature a special high molarity reference design for stability, reliability and maximum service life in demanding pool and…

Add to Cart | $239.05

S200CD/BNC – pH Sensor, Laboratory and General Use, Extended Life

Applications such as environmental and wastewater sampling involve some uncertainty about what samples may contain. When dealing with unknown or…

Add to Cart | $112.62

S200CD/10/BNC – Process pH Sensor, Light Duty

The S200CD/10/BNC is a light duty pH probe for continuous monitoring of surface water and ground water, including environmental and…

Add to Cart | $123.05


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