Instruction manual

MODEL XMT-P pH/ORP TABLE OF CONTENTS
TABLE OF CONTENTS CONT’D
ii
8.0 CALIBRATION — TEMPERATURE........................................................................ 79
8.1 Introduction .............................................................................................................. 79
8.2 Calibrating Temperature........................................................................................... 79
9.0 CALIBRATION — pH ............................................................................................. 81
9.1 Introduction .............................................................................................................. 81
9.2 Procedure — Auto Calibration ................................................................................. 82
9.3 Procedure — Manual Two-Point Calibration............................................................ 84
9.4 Procedure — Standardization .................................................................................. 85
9.5 Procedure — Entering a Known Slope Value .......................................................... 86
9.6 ORP Calibration ....................................................................................................... 87
10.0 TROUBLESHOOTING ........................................................................................... 88
10.1 Overview .................................................................................................................. 88
10.2 Troubleshooting When a Fault or Warning Message is Showing ............................ 89
10.3 Troubleshooting When No Fault Message is Showing — Temp.............................. 92
10.4 Troubleshooting When No Fault Message is Showing — HART............................. 92
10.5 Troubleshooting When No Fault Message is Showing — pH .................................. 92
10.6 Troubleshooting Not Related to Measurement Problems ........................................ 95
10.7 Simulating Inputs — pH ........................................................................................... 95
10.8 Simulating Temperature ........................................................................................... 96
10.9 Measuring Reference Voltage.................................................................................. 97
11.0 MAINTENANCE ...................................................................................................... 98
11.1 Overview .................................................................................................................. 98
11.2 Replacement Parts .................................................................................................. 98
12.0 pH MEASUREMENTS............................................................................................. 99
12.1 General .................................................................................................................... 99
12.2 Measuring Electrode ................................................................................................ 100
12.3 Reference Electrode ................................................................................................ 100
12.4 Liquid Junction Potential .......................................................................................... 101
12.5 Converting Voltage to pH ......................................................................................... 101
12.6 Glass Electrode Slope ............................................................................................. 102
12.7 Buffers and Calibration ............................................................................................ 102
12.8 Isopotential pH ......................................................................................................... 103
12.9 Junction Potential Mismatch .................................................................................... 103
12.10 Sensor Diagnostics .................................................................................................. 104
12.11 Shields, Insulation, and Preamplifiers...................................................................... 104
continued on following page