VEGA D81 Hydrostatic pressure transmitter - Manual (Page 38)

38 Pressure transmitter D81
Max. 32 index markers (value pairs) can be
entered.
• Quit the menu with "
OK".
• Confirm the message with "
OK" and your
individual linearisation curve will be saved
in the sensor.
Again in the menu window " Conditioning" you
can enter a measured value integration with
the menu item "
Integration time". This is useful
for fluctuating product surfaces to smooth the
display and output of measured values. As a
standard feature, the integration time is pre-
set to 0 seconds.
• Quit the menu with "
OK".
You are again in the menu window " Instru-
ment data parameter adjustment".
300 mbar
= 5 liters
0 mbar
= 0 liters
700 mbar
= 35 liters
1000 mbar
= 100 liters
Vacuum
Saline
solution
Pressure
transmitter
Setup
In the field " Transfer measured value" the
current pressure as a percentage of the
adjusted span is displayed. The measuring
span has already been adjusted with the
min./max adjustment. In our example this is in
the range between 50 … 1000 mbar.
The user-programmable linearisation curve is
generated by index markers, consisting of
the value pairs "
Linearised" (volume in % or in
the selected unit) and " Percentage value"
(level or filling height in %).
Defining the linearisation curve by incre-
mental filling
In the characteristics of the example (evacu-
ated vessel), you see four index markers or
value pairs. There is always a linear interpola-
tion between the index markers.
• Click in the check box " Show scaled val-
ues", to have the selected unit of measure-
ment displayed on the y-axis (left bottom
part in the menu window).
Index marker 1 is at 0 % level or pressure
(percentage value [%]), corresponding to an
actual pressure of 0 mbar.
Index marker 2 is at 30 % level or pressure
and 5 % filling volume.
Index marker 3 is at 70 % level or pressure
and 35 % filling volume.
Index marker 4 is at 100 % level or pressure
and 100 % filling volume (100 litres).