Hach MP-4 User Manual page 5

Appendix D Additional information on pH and ORP (MP-6
and MP-6p models)
D.1 pH ............................................................................................................. 55
D.1.1 pH as an indicator .......................................................................... 55
D.1.2 pH units .......................................................................................... 55
D.1.3 pH sensor ....................................................................................... 55
D.1.4 Sources of error ............................................................................. 56
D.1.5 Temperature compensation ........................................................... 57
D.2 Oxidation Reduction Potential/Redox (ORP) .............................. 57
D.2.1 ORP as an indicator ....................................................................... 57
D.2.2 ORP units ....................................................................................... 57
D.2.3 ORP sensor ................................................................................... 57
D.2.4 Sources of error ............................................................................. 57
......................................................................................... 55
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