EUTECH INSTRUMENTS alpha-pH 2000D Manuel d'instructions Page 46

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Instruction Manual αlpha-pH2000D
- 40 -
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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