EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Instrukcja Obsługi Pobierz pdf (Strona 44)

Instruction manual αlpha DO 2000

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.

88 90

RELAY OFF

HYSTERESIS BAND

FORWARD DIRECTION

REVERSE DIRECTION

SP1

SP2

RELAY ON

SP1 Set to LO

SP2 Set to HI

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EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Instrukcja Obsługi Strona 44