ABB AX400 Series User Manual page 22

Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468
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4.O1pH
Set Buffer 1
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9.18pH
Set Buffer 2
Set Auto Buffers
20
Set Buffer 1
Set the pH value of the buffer 1 solution – see Appendix A for pH tables.
Set Buffer 2
Set the pH value of the buffer 2 solution.
Note. The solution selected for buffer 2 must be at least 2 ph greater than that
selected for buffer 1, e.g. if buffer 1 is set to 7 pH, buffer 2 must be set to at least 9 pH.
4 Setup
IM/AX4PH Rev. P