EUTECH INSTRUMENTS alpha-pH 2000D Manual de Instruções descarregar pdf (Página 48)

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Thermo Scientific Alpha pH 560 43

The relay of the pH Controller activates when the set-point is reached

(forward direction). In the reverse direction, it does not de-activate

when the value reaches the set-point. Instead, it continues to be active

till the value reaches the amount set by the Hysteresis band.

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.

Control characteristics of pH Controller used as a limit value switch

Figure 0–28.

Appendix 2

Graphical

Representation of

he Function of

Hysteresis

Appendix 3

General Instructions

Concerning

Controller Settings

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EUTECH INSTRUMENTS alpha-pH 2000D Manual de Instruções Página 48