DVZ
page 12
DVZ B06/1122
8.5 Main menu items
8.5.1
Switching point
The switching point is entered in the menu item "
Spo
". A setting value between
000 and 999 can be selected. This value can also include a decimal point. The
decimal point can be set at two points (e.g. 10.0 or 1.00). If the measuring value
is the set switch point, the electronic is activated and is signalised by a lightning
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.
8.5.2
Hysteresis
After the setting of switching point, the hysteresis can be entered as a negative
value in the "
HYS
" menu. The standard hysteresis value is zero. In operation
condition this can lead to ambiguous switching behaviour if the reading fluctuates
around the switching point or window point. Aid can be given here by increasing
the hysteresis. The hysteresis relates to the switching point and the window point
(switching point minus hysteresis; window point plus hysteresis).
Example:
Switching point 20 L/min; Hysteresis: -2.5 L/min
The electronic switches when 20 L/min is exceeded and switches back
when the reading drops below 17.5 L/min.
8.5.3
Window point (duo-point)
As well as the switching point, it is also to define a "
duo
" (duo-point), the window
point. This must be higher than the switching point. Using the window point and
the switching point it is possible to monitor the measurement value in a certain
range. The switching point limits the measurement range to smaller values and
the window point to larger values.
Changing code
Value setting
Storing
7sec
4-20
mA
0-20
mA
Analog output
choosing
