JUMP TO ORP PRODUCTS

Oxidation Reduction Potential (ORP)

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.

Preparing chemical solutions?

Visit our pH calculator first.

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.

ORP

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

Shop All

Popular ProductsSensorex ORP Best Sellers

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 | $198.49

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

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 | $586.36

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 | $745.26

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 | $353.37

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 | $353.37

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 | $436.83

S8200-ORP – Modular In-line ORP Sensors

The S8200-ORP is a self-cleaning ORP sensor that delivers the most reliable online monitoring in a unique, modular package that…

Add to Cart | $576.73

Questions?

Thumbs up