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12.3 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 1 0 . 0

7.0

R E L A Y O F F

H Y S T E R E S I S B A N D

( D E F A U L T = 0 . 5 p H )

F O R W A R D D I R E C T I O N

R E V E R S E D I R E C T I O N

S P 1

S P 2

R E L A Y O N

S P 1 S e t t o L O

S P 2 S e t t o H I

1 2 ... 32 33 34 35 36 37 38 39 40 41 42

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EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Bedienerhandbuch Seite 37