Thermo Fisher Scientific Alpha pH 800 - Manual (Page 28)

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7.3.3 Choosing High or Low set points
Select a “lo” to activate relay when the pH/ORP value undershoots the set point;
select a “Hi” to activate relay when the value overshoots the set point. Using
both SP1 and SP2, the following configuration for the set points can be selected:
lo/lo, lo/hi, hi/lo, or hi/hi.
1) Follow directions in 7.3.1 to enter Control Relay mode.
2) Press ENTER key until upper display shows Lo or Hi and lower display
shows SP1 (SP2).
3) Press
Δ or ∇ keys to select low (lo) or high (hi) set point for SP1 (SP2).
4) Press ENTER key to confirm.
5) Proceed to 7.3.4 step 3, or return Measurement mode by pressing
Δ and ∇
keys simultaneously (escape).