Hach 6120118, User Manual, Page: 4 / 52

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Table of Contents
7.3 Troubleshooting the pH or ORP Sensor ............................................................................................................ 35
Section 8 Replacement Parts and Accessories.................................................................................................. 37
8.1 Replacement Items, Accessories, and Reagent and Standards ....................................................................... 37
Section 9 How to Order ......................................................................................................................................... 39
Section 10 Repair Service..................................................................................................................................... 40
Section 11 Limited Warranty ................................................................................................................................ 41
Section 12 Compliance Information .................................................................................................................... 43
B.1 pH Measurement Theory ............................................................................................................................ 47
B.2 PID Controller Basics ................................................................................................................................. 48