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Ppendix, Imple explanation on the function of hysteresis, Hysteresis band (default = 0.5 ph) – Thermo Fisher Scientific Alpha pH 2000D User Manual

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11.3

Appendix 3 – Simple explanation on the function of hysteresis


SP1 Set to LO

SP2 Set to HI

RELAY ON

RELAY OFF

4.5

9.5

10.0

4.0


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

.











HYSTERESIS BAND
(DEFAULT = 0.5 pH)

FORWARD DIRECTION

SP1

SP2

REVERSE DIRECTION

7.0

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