The Consumer Guide to Industrial pH and ORP Instrumentation

Table of Contents

2.1 Definition of pH

2.2 Definition of Oxidation Reduction Potential (ORP)

2.3 Principle of Operation of Potentiometry

2.4 Principle of Operation of pH Measurements - Glass Membrane

2.5 Principle of Operation of pH Measurements - ISFET

2.6 Principle of Operation of ORP Measurements

2.7 Junction Potential

2.8 Calibration

2.9 Temperature Compensation for Measurement Half-Cell

2.10 Temperature Compensation for Solution Activity

2.11 Ionic Strength Effects

2.12 Solvent Effects

2.13 Acid Effects

2.14 Alkali Effects

2.15 Speed of Response

2.16 Calibration Intervals

2.17 Sensor Selection

2.18 Typical Applications

2.19 Additional Information

3.1 Measurement Half-Cell Technology

3.2 Reference Half-Cell Technology

3.3 Sensor Integration

3.4 Sanitary pH/ORP Sensors

3.5 Intrinsically Safe Sensors

4.1 pH/ORP Electronic Units

4.2 Power Supply

4.3 Sensor Diagnostics

4.4 Control Capability / Relay Contacts

4.5 Multi-Input and Multi-Parameter Electronic Units

4.6 HART Electronic Units

4.7 Fieldbus Electronic Units

5.1 Sensor Data

5.2 Electronic Unit Data

6.1 Sensor Data

6.2 Electronic Unit Data

8.1 Performance Statements

8.2 Calculating Performance Statements

8.3 Measurement Range

8.4 Data Analysis

9.1 pH and ORP Sensor Specifications

9.2 Electronic Unit Specifications

10.1 Temperature Effects

10.2 Other Effects

11.1 Resistance to High Temperature Degradation

11.2 Improved Ingress Protection

11.3 Inline Detection of Sensor Faults

11.4 Multi-Sensor Electronic Units to Reduce Cost

12.1 Fluid Characteristics

12.2 Piping and Hydraulic Considerations

12.3 pH/ORP Analyzer Installation

12.4 pH/ORP Analyzer Calibration

12.5 Ambient Conditions

13.1 Flow-Through Housing

13.2 Inline Cleaning Devices

13.3 Insertion/Removal Devices

13.4 Offline Automated Cleaning/Calibration Devices

15.1 Major Suppliers of pH and ORP Instrumentation

15.2 Other Suppliers of pH and ORP Instrumentation