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The Consumer Guide to
Industrial pH and ORP Instrumentation

Guide Description

A completely independent guide to industrial pH and ORP instrumentation ranked by performance and supplier (limited to twelve major world-wide manufacturers of pH and ORP instruments) with foreword by Greg McMillan (author of "Advanced pH Measurement and Control").

The guide contains technical information about evaluating and applying pH and ORP instruments with pointers for installation. Tables include the types of pH and ORP instruments and selected features that are available from each supplier, along with their country of origin or source.

This guide is indispensable for designers, engineers, owners and end users of pH and ORP instruments. See where your instrument ranks and use this guide to help you choose your next pH and ORP instruments.

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Table Of Contents
  • Foreword by Gregory K. McMillan
  • 0.0   Disclaimer
  • 1.0   Executive Summary
  • 2.0   pH and ORP Measurement
    • 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
  • 3.0   Sensor Design
    • 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
  • 4.0   Electronic Unit Design
    • 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
  • 5.0   Supplier Data
    • 5.1   Sensor Data
    • 5.2   Electronic Unit Data
  • 6.0   Supplier Data Analysis
    • 6.1   Sensor Data
    • 6.2   Electronic Unit Data
  • 7.0   Summary of Analysis
  • 8.0   pH and ORP Sensor Performance
    • 8.1   Performance Statements
    • 8.2   Calculating Performance Statements
    • 8.3   Measurement Range
    • 8.4   Data Analysis
  • 9.0   Reference Performance
    • 9.1   pH and ORP Sensor Specifications
    • 9.2   Electronic Unit Specifications
  • 10.0   Actual Performance
    • 10.1   Temperature Effects
    • 10.2   Other Effects
  • 11.0   Supplier Claims
    • 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
  • 12.0   Installation Considerations
    • 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
  • 13.0   Accessories
    • 13.1   Flow-Through Housings
    • 13.2   Inline Cleaning Devices
    • 13.3   Insertion/Removal Devices
    • 13.4   Offline Automated Cleaning/Calibration Devices
  • 14.0   Explanation of Attachments
  • 15.0   pH and ORP Analyzer Supplier Profiles
    • 15.1   Major Suppliers of pH and ORP Instrumentation
    • 15.2   Other Suppliers of pH and ORP Instrumentation
  •  
  • Attachments
    •   Availability of Selected Features (pH and ORP Sensors)
    •   pH Sensor - Reference Performance
    •   ORP Sensor - Reference Performance
    •   Availability of Selected Features (pH and ORP Electronic Units)
    •   pH Electronic Unit - Reference Performance
    •   ORP Electronic Unit - Reference Performance
  •  
  • About the Authors
Spitzer and Boyes, LLC
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