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Seite 9
Changing code
Value setting
Storing
7sec
4-20
mA
0-20
mA
Analog output
choosing
4.5. Main Menu Items
Switching point
The switching point is entered in menu item "
SPo, SP1, SP2
". A value in the
range 000 to 999 may be chosen. A decimal point position is also assigned to this
value. The position of the decimal point can be set after the first, second or last
position (no decimal point). If the indicated value exceeds the set switching point,
then the electronics switches and energizes the LED.
If the hysteresis is equal to zero and the window point is de-activated, the
electronic switches back whenever the indicated value falls below the switching
point.
Hysteresis
After the switching point, hysteresis can be entered as a negative value in the
menu "
HYS
". The default hysteresis value is zero. However this can lead to
confused switching, when the measuring signal fluctuates around the switching
point or window point. This problem can be cured by increasing the hysteresis.
The hysteresis is based on the switching point and the window point (switching
point minus hysteresis; window point plus hysteresis).
Example: switching point 100 l/min; hysteresis: -2.5 l/min
The electronics switches when 100 l/min is exceeded and switches
back when the flow rate falls below 97.5 l/min.
Window point (duo point)
A window point "
duo
" (duo point) can be defined in addition to the switching
point. The window point must be greater than the switching point. The measured
value can be monitored within a set range by means of the window point and
switching point. The switching point marks the lower end of the range of values
and the window point the upper end.
