Intro to pH and ORP
For the non-scientist or engineer, pH and ORP are the most well known analytical measurements. People often get their first experience measuring the pH of acids and bases by using litmus paper in school chemistry classes. Later they may hear references to oxidation with household cleaners or even the paint fading on their automobile.
The articles listed below are compiled from common questions Hamilton has received from our users. They cover topics from basic sensor functionality to questions about the installation, usage, calibration, and care of pH and ORP probes. We hope you will find them useful in your daily work with these measurements.
Ever wonder how pH sensors actually work? This video goes through the basic design and functionality of the standard glass membrane combination pH sensor.
Topics Within the Video:
• What is pH actually measuring?
• The relationship with hydrogen ion concentration and millivolt output of the sensor.
• Measurement electrode versus reference electrode.
• Zero point (offset) and slope values.
• What are the effects of temperature on pH measurement?
ORP is an abbreviation for “Oxidation Reduction Potential” and is commonly referred to as a “Redox” as the sensor is used to measure redox reactions.
• How Do ORP Sensors Work?
• What is the ORP unit of Measure?
• What effect does temperature have on ORP?
• What effect does pH have on ORP?