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Representation of
General Instructions
Controller Settings
Thermo Scientific Alpha pH 560
1.800.561.8187
Index: Error! No text of specified style in document.
Appendix 2
The relay of the pH Controller activates when the set-point is reached
(forward direction). In the reverse direction, it does not de-activate
Graphical
when the value reaches the set-point. Instead, it continues to be active
till the value reaches the amount set by the Hysteresis band.
the Function of
Hysteresis
Example: You have set your high set point at pH 10.0 and your
hysteresis value at pH 0.5. If your measured value overshoots pH 10.0,
the pH Controller's relay activates. The actions of the external device
will cause the solution's pH to drop. The relay will deactivate, when the
pH value drops below 9.5 pH.
Appendix 3
Control characteristics of pH Controller used as a limit value switch
Concerning
Figure 0–28.
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