DVZ
DVZ B06/1122
page 13
If the window point (duo-point) is less than or equal to the switching
point, an error report (Er4) will be indicated on the display and its
value is deleted and its function is invalid (in the case that the
window point and switching point out of adjustment).
The value is set in the same way as the switching point.
The window point is needed for process, monitoring of a certain temperature
range.
Example:
Switching point: 10 L/min; window point: 20 L/min; hysteresis: -1 L/min
The electronic switches when 10 L/min is exceeded.
If the switching value remains between 9 L/min (10-1) and 21 L/min (20+1), the
contact will also remain in active switching condition (LED on). If it exceeds
21 L/min or is below 9 L/min the electronic switches back.
Switching behaviour
The following diagram clarifies the switching behaviour of the electronic switch.
The contact closes (contact type: no) when it drops below the switching point or
the window point. It only opens again if the window point plus hysteresis is
exceeded or if it drops below the switching point minus hysteresis. An
LED
indicates the switching condition of the switching point.
Time / t
Display
bar (°C)
Hysteresis
LED on
Time / t
Display
bar (°C)
Switchpoint
Hysteresis
LED on
Hysteresis
Window point
LED on
Flow
Flow
