Operating instructions

8 Application exa mples
8.1 Interface measurement with VEGAFLEX 67
In an interface measurement, there are two different media
which do not mix, e.g. water and oil or solvents. To detect the
volume of both products, it is necessary to detect the height of
the upper liquid (level) and the interface between the two
products. A VEGAFLEX 67 is necessary as a transmitter which
delivers the distance to the upper medium as well as the
distance to the interface. Via the adjustment in VEGAMET 625
the level, interface and layer thickness of the upper medium
can be calculated and displayed.
The following steps are necessary:
l Selection of the application
- Select under "Device settings – Application" the entry
"Interface measurement" and confirm with [OK]. Via the
[–>] key you reach the next step.
l Assignment of the inputs and measurement loops
- Select "Input – Change input". Now an automatic
sensor search is started and, if there is a proper
connection, VEGAFLEX 67 will be displayed. Accept
the settings with [OK] and move to the DK value input
with [–>]. The input variables are automatically assig-
ned to the following measurement loops:
- Meas. loop 1: Interface (level of the lower medium)
- Meas. loop 2: Level (total level of both products)
- Meas. loop 3: Layer thickness (thickness of the upper
medium)
l Input of the DK value
- Enter the exact DK value of the upper medium. For
further information on the DK value, see the operating
instructions manual of VEGAFLEX 67.
l Adjustment
- Each VEGAFLEX 67 is supplied with default settings.
The values of this adjustment are automatically trans-
ferred to VEGAMET 625 when creating an interface
measurement. Normally, a manual adjustment is not
necessary. Should the instrument get a special
adjustment, this adjustment can be carried out under
"Meas. loops – Adjustment". Keep in mind that this
adjustment must be carried out for all three measure-
ment loops separately.
42 VEGAMET 625 - Double channel Hart signal conditioning instrument
Application examples
28970-EN-050616