Switching Output - TESTO 6457 Instruction Manual

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4.3.2 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 flow monitoring:
Hysteresis function
Note
Note
16
OFF (output switched to high impedance)
Pulse output
SP = Switching point
rP = Reset point
HY = Hysteresis
Hno / Fno = NO (normally open)
When the hysteresis function is set, the switching point (SP) is
defined first, then the reset point (rP), which must be a lower value.
If only the switching point is changed, the reset point is changed
automatically, the previously set gap remains constant.
When set to the window function, the upper limit value (FH) and
lower limit value (FL) have a fixed hysteresis of 0.25% of the full
scale value. This keeps the switching status of the output stable if
the flow fluctuates very slightly.
Window function
FH = Upper limit value
FL = Lower limit value
FE = Window
Hnc / Fnc = NC (normally closed)