EUTECH INSTRUMENTS alpha-pH 2000D Manual de Instruções descarregar pdf (Página 46)

Instruction Manual αlpha-pH2000D

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11.3 Appendix 3 – Simple explanation on the function of hysteresis

The controller relay activates when the set-point is reached. 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.

4.0

4.5

9.5 10.0

RELAY OFF

HYSTERESIS BAND

(DEFAULT = 0.5 pH)

FORWARD DIRECTION

REVERSE DIRECTION

SP1

SP2

RELAY ON

SP1 Set to LO

SP2 Set to HI

7.0

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EUTECH INSTRUMENTS alpha-pH 2000D Manual de Instruções Página 46