Instruction Manual
D
lpha-CON 560
37
10.2 Appendix 2
Graphical Representation of the Function of Hysteresis
100
RELAY OFF
Forward Direction
Reverse Direction
SP1
SP2
RELAY ON
SP1 = 100
& Set to LO
SP2 = 1900
& Set to HI
μ
S
μ
S
μ
S
120
1880
1900
H
Y
ST
E
R
ES
IS B
AN
D
Defa
u
lt =
2
0
μ
S
H
Y
ST
E
R
ES
IS B
AN
D
Defa
u
lt =
2
0
μ
S
The relay of the conductivity controller activates when the set-point is
reached (forward direction). 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.
Example:
You have set your high set point at 1900
μ
S and your hysteresis
value at 20
μ
S. If your measured value overshoots 1900
μ
S, the controller’s
relay activates. The actions of the external device will cause the solution’s
conductivity to drop. The relay will deactivate, when the conductivity value
drops below 1880
μ
S.
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