pH and ORP Learning Handbook - TI12B00A20-01E - 1st edition

Oct 5, 2026

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pH and ORP Learning Handbook explains core principles for pH theory and oxidation-reduction potential (ORP) measurement. It covers the pH scale, potentiometric measurement concepts, hydrogen and reference electrode principles, glass electrode composition, temperature effects, insulation resistance, buffer solutions, and maintenance and calibration practices. It also introduces ORP theory, measuring circuits and electrode composition, compares standard ORP with pH-compensated ORP, and provides guidance on electrode lifespan, storage, and troubleshooting.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages72

Reading Time3 h 1 min

AccessFree to download

Introduction

Basics on pH theory

Concept of pH

The pH scale

Measuring the pH scale

Principle of potentiometric pH measurement

Hydrogen electrodes, the basic principle

Basics on ORP

Concept of ORP

The ORP Scale

Measuring the ORP Value

Standard ORP vs pH Compensated ORP

Product & Features

Electronics/Transmitters/Converters

Sensors/Electrodes

Lifespan & storage of electrodes

Troubleshooting and diagnostic

[www.yokogawa.com](www.yokogawa.com) pH and ORP Learning Handbook TI12B00A20-01E ©Copyright March 2014 1st edition [www.yokogawa. com](www.yokogawa. com) Table of Contents 1 Introduction ................................................................................................................... 4 2 Basics on pH theory .......................................................................................................4 2.1 Concept of pH .........................................................................................................................4 2.2 The pH scale ........................................................................................................................... 5 2.3 Measuring the pH scale ........................................................................................................... 6 2.4 Principle of potentiometric pH measurement ................................................................................ 7 2.5 Hydrogen electrodes, the basic principle .................................................................................... 7 2.5.1 Composition of the glass electrode ..................................................................................... 9 2.5.2 Composition of the reference electrode ............................................................................... 9 2.5.3 The measuring circuit with a glass and a reference electrode .............................................. 10 2.5.4 More information about the glass electrode ........................................................................ 11 2.5.5 More information about the reference system ..................................................................... 12 2.5.6 Construction of the temperature Electrode .......................................................................... 15 2.5.7 The combined pH sensors ................................................................................................ 15 2.6 The effect of temperature ....................................................................................................... 16 2.7 Isolation resistance ................................................................................................................. 18 2.8 Buffer solutions ...................................................................................................................... 18 2.9 Periodic maintenance and calibration of pH sensors .................................................................. 19 2.10 Differential electrodes ............................................................................................................. 23 3 Basics on ORP ..............................................................................................................28 3.1 Concept of ORP .................................................................................................................... 28 3.2 The ORP Scale ...................................................................................................................... 28 3.3 Measuring the ORP Value ....................................................................................................... 29 3.4 Composition of the Measuring Electrode .................................................................................. 31 3.5 Composition of the Reference Electrode .................................................................................... 32 3.6 The Measuring Circuit ............................................................................................................ 32 3.7 Standard ORP vs pH Compensated ORP .................................................................................. 32 3.8 Standard Maintenance and Calibration .................................................................................... 33 2 TI12B00A20-01E First Edition March 2014 Back to

FAQs

What topics are covered in the handbook’s pH theory section?

It explains pH concepts and the pH scale, how pH is measured, potentiometric measurement principles, hydrogen electrode fundamentals, glass and reference electrode compositions, temperature effects, insulation resistance, buffer solutions, and maintenance/calibration of pH sensors.

How does the handbook describe ORP measurement?

It covers ORP theory and its scale, measuring ORP value, measuring and reference electrode composition, the measuring circuit, and a comparison of standard ORP with pH-compensated ORP, including standard maintenance and calibration.

What troubleshooting issues and diagnostics does the handbook address?

It lists common error sources such as cracked membranes, fouling and poisoning of the reference electrode, issues from damped or shorted electrode cables and connections, stray voltage interference, and errors due to poor installation.

Oct 5, 2026

Uploaded by Blitz