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JUMP TO ORP PRODUCTS

Oxidation Reduction Potential (ORP)

ORP

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

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Popular ProductsSensorex ORP Best Sellers

Hydroponics & Agriculture
Online Sensors
S272CD-ORP-MA and S272CD-ORP-MB – Smart ORP Sensors, Online Process

Moderately contaminated water, such as industrial source water or natural water resources, may contain chemicals and debris that damage ORP…

Add to Cart | $673.73

Controllers & Transmitters
Hydroponics & Agriculture
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 | $1,328.40

Lab Sensors
Laboratory & Analytical
Double-junction, Plastic Body Flat pH and ORP Electrodes with DIN 13.5 Cap

Our S354CD electrodes have a rugged flat measurement surface, which breaks less easily when it comes in contact with hard…

Add to Cart | $241.89

Calibrations & Maintenance
Chlorine
Sensorex Smart Sensor User Interface Software

Sensorex Smart Sensor User Interface Software is the perfect partner for your Sensorex Smart Probe or Smart Probe modular system.…

Add to Cart | $0.00

Controllers & Transmitters
ORP
TX105 – pH/ORP Transmitter, Loop Powered 4-20mA

Our TX105 is a fully-featured ORP/pH transmitter for use with pH and ORP sensors. The large display shows pH/ORP value simultaneously…

Add to Cart | $913.78

Conductivity
ORP
EM805-EC – Smart Conductivity Modules (4-20mA or MODBUS/RS485) for S8000 Series

The EM805-EC is our most cost-effective solution for connecting our S8000 series Contacting Conductivity sensors to a PLC or SCADA…

Add to Cart | $433.38

ORP
pH
EM805 – Smart modules (4-20mA or MODBUS/RS485) for S8000 Series

The EM805 is our most cost-effective solution for connecting our S8000 series pH and ORP sensors to a PLC or…

Add to Cart | $406.02

Online Sensors
ORP
S8100 – Process ORP Sensor, Submersion

Our S8000 series ORP sensors deliver the most reliable online ORP monitoring in a unique, modular package that minimizes total…

Add to Cart | $545.32

What is ORP?

Oxidation reduction potential (ORP), also known as REDOX, is a measurement that reflects the ability of a molecule to oxidize or reduce another molecule:

  • Oxidation is the loss of electrons, so oxidizers accept electrons from other molecules
  • Reduction is the gain of electrons, so reducers donate electrons to other molecules

Oxidation reduction potential is measured as a single voltage in millivolts (mV). Oxidizers have a positive ORP value, while reducers have a negative ORP value.

Why is ORP Measurement Needed?

ORP measurements are a cost effective method used to monitor a variety of processes. Common applications include disinfection using chlorine, ozone, and bromine. All of these species are strong oxidizers, so ORP is used as an indicator of sanitizing activity. ORP is also used in process applications to monitor destruction of chromate or cyanide, as well as in bleach production and wet scrubbers.

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How is ORP used?

Oxidation-Reduction Potential (ORP) is widely used in industrial, municipal wastewater, and laboratory settings to monitor and control chemical reactions, disinfection, and treatment processes.

Industrial Water Treatment

ORP is used in cooling towers, boilers, and manufacturing processes to control oxidation-reduction reactions, preventing corrosion, scaling, and biofouling. It ensures proper dosing of oxidizing agents like chlorine and ozone, optimizing water quality and equipment longevity.

Municipal Wastewater Treatment

Wastewater treatment plants use ORP to monitor biological processes such as nitrification and denitrification, ensuring efficient removal of ammonia and other contaminants. By maintaining appropriate ORP levels, operators can optimize aeration and chemical dosing to improve treatment efficiency and reduce environmental pollution.

Drinking Water Disinfection and Chlorination Control

ORP monitoring helps regulate disinfectants like chlorine and ozone in municipal drinking water systems to ensure safe and effective pathogen removal. By maintaining ORP within the ideal range (typically 650-800 mV), water treatment plants prevent microbial contamination while minimizing harmful byproducts.

Laboratory Liquid Analysis and Quality Control

In laboratories, ORP is used to study oxidation-reduction reactions, assess water quality, and ensure chemical stability in industries like pharmaceuticals and food processing. It helps researchers and quality control analysts detect contaminants, verify disinfectant effectiveness, and maintain product integrity.

How is ORP Measured?

ORP is measured using an electrochemical sensor called an ORP or REDOX sensor. Similar to to pH sensors, the most common type of ORP sensor is a combination sensor with a measuring electrode and a reference electrode. The measuring cell, typically a noble metal like platinum or gold, detects changes in REDOX potential, while the reference provides a stable comparison signal.

Like a pH measurement, an ORP measurement is not a direct indicator of concentration, but rather an indicator of activity. However, in solutions with one active species, like pool water containing chlorine, ORP correlates to concentration.

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