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MODEL 3081 pH/ORP TABLE OF CONTENTS
TABLE OF CONTENTS CONT’D
13.0 pH MEASUREMENTS............................................................................................. 114
13.1 General .................................................................................................................... 114
13.2 Measuring Electrode................................................................................................ 115
13.3 Reference Electrode ................................................................................................ 115
13.4 Liquid Junction Potential.......................................................................................... 116
13.5 Converting Voltage to pH ......................................................................................... 116
13.6 Glass Electrode Slope ............................................................................................. 117
13.7 Buffers and Calibration ............................................................................................ 117
13.8 Isopotential pH......................................................................................................... 118
13.9 Junction Potential Mismatch .................................................................................... 118
13.10 Sensor Diagnostics .................................................................................................. 119
13.11 Shields, Insulation, and Preamplifiers...................................................................... 119
14.0 ORP MEASUREMENTS.......................................................................................... 120
14.1 General .................................................................................................................... 120
14.2 Measuring Electrode................................................................................................ 121
14.3 Reference Electrode ................................................................................................ 121
14.4 Liquid Junction Potential.......................................................................................... 121
14.5 Relating Cell Voltage to ORP................................................................................... 122
14.6 ORP, Concentration, and pH.................................................................................... 122
14.7 Interpreting ORP Measurements ............................................................................. 123
14.8 Calibration................................................................................................................ 124
15.0 THEORY - REMOTE COMMUNICATIONS ............................................................. 126
15.1 Overview of HART Communications........................................................................ 126
15.2 HART Interface Devices........................................................................................... 126
15.3 AMS Communication ............................................................................................... 127
16.0 GLOSSARY............................................................................................................. 128
17.0 RETURN OF MATERIAL......................................................................................... 134