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8
4.2 Switching output
OUTx changes its switching status if it is above or below the set switching limits
(flow or temperature)� Hysteresis or window function can be selected�
Example of volumetric flow monitoring:
Hysteresis function
Window function
SP
rP
FL
FH
SP = set point
rP = reset point
HY = hysteresis
Hno / Fno = NO (normally open)
FH = upper limit
FL = lower limit
FE = window
Hnc / Fnc = NC (normally closed)
When the hysteresis function is set, the set point (SP) is defined first and
then the reset point (rP) which must have a lower value� If only the set point
is changed, the reset point is changed automatically; the difference remains
constant�
When set to the window function, the upper limit value (FH) and the lower
limit value (FL) have a fixed hysteresis of 0�25 % of the final value of the
measuring range� This keeps the switching status of the output stable if the
volumetric flow varies slightly�