Hysteresis function (Hno, Hnc) (fig. 1):
The hysteresis keeps the switching state of the output stable if the
level of the medium varies about the preset value.
With the level rising, the output switches when the switch-on point
has been reached (SPx). With the level falling, the output does not
switch back until the level falls below the reset point rPx.
The hysteresis for SPx can be adjusted: First the switch-on point is set,
then the switch-off point with the requested distance.
Window function (Fno, Fnc) (fig 2)
The window function enables the monitoring of a defined acceptable
range. When the level of the medium varies between the switch-on
point (SPx) and the switch-off point (rPx), the output is switched (win-
dow function / NO) or not switched (window function / NC).
The width of the window can be set by means of the difference
between SPx and rPx. SPx = upper value, rPx = lower value.
39
ENGLISH
t
L
SP
rP
1
0
1
0
t
L
SP
rP
1
0
1
0
Hno
hysteresis
Fno
acceptable range
Fnc
L = level
1
2
Hnc
