15
UK
Hysteresis function:
The hysteresis keeps the switching state
of the output stable if the system pressure
varies about the preset value With the
system pressure rising, the output switches
when the switch-on point has been reached
(SPx) With the system pressure falling
the output does not switch back until the
switch-off point (rPx) has been reached
The hysteresis can be adjusted: First the
switch-on point is set, then the switch-off
point with the requested distance
t
P
SP
rP
1
0
1
0
Hno
Hnc
1
Hysteresis
1:
Window function:
The window function enables the
monitoring of a defined acceptable range
When the system pressure varies between
the switch-on point (SPx) and the switch-off
point (rPx), the output is switched (window
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
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Fnc
Fno
Acceptable range
1:
Scaling the measuring range (analogue output)
With the parameter “Analogue start point” (ASP) the measured value at which
•
the output signal is 4 mA or 0 V is defined
With the parameter “Analogue end point” (AEP) the measured value at which
•
the output signal is 20 mA or 10 V is defined
Minimum distance between ASP and AEP = 25 % of the final value of the
measuring range (scaling factor 4)
