21
7 Set up with the integrated display and adjustment unit
VEGAMET 342 • 4 … 20 mA
63731-EN-221107
•
Flow measurement flume/weir
•
Density
•
Pressurized vessel
•
Overflow basin
Information:
An overview of the available applications and functions can be found
in the appendix
The main menu is divided into four areas with the following functions:
•
Measuring point:
Includes settings for adjustment, linearization,
scaling, relay outputs, …
•
Display:
Contains settings for display of measured values
•
Extended functions:
Includes settings for fail safe relay, access
protection, reset, …
•
Diagnosis
Includes information on device type/status, …
7.4.1 Measurement loop
The VEGAMET 342 is designed for the connection of two independ-
ent sensors. Thus two independent measurements can be carried out.
Furthermore, a third measuring point can be used to calculate a new
value between the two input values.
With the menu item "
Sensor input
" you can determine which of the
two inputs is assigned to measurement loop 1 or measurement loop
2. The following assignment is factory set:
•
Measuring point 1 -> Sensor input 1
•
Measuring point 2 -> Sensor input 2
If measuring point 2 is not used, it can be deactivated using this func-
tion. This has the advantage that no fault signal is issued if the sensor
input is not connected.
To suppress fluctuations in the measured value display, e.g. caused
by an agitated product surface, a damping can be set. This time can
be between 0 and 999 seconds. Remember that the reaction time of
the entire measurement will then be longer and the sensor will react
to measured value changes with a delay. In general, a period of a few
seconds is sufficient to smooth the measured value display.
A linearisation is necessary for all vessels in which the vessel volume
does not increase linearly with the level, for example a horizontal
cylindrical or spherical tank. Corresponding linearisation curves are
preprogrammed for these vessels. They represent the correlation
between the level percentage and vessel volume. By activating the
appropriate curve, the volume percentage of the vessel is displayed
correctly. If the volume should not be displayed in percent but e.g. in l
or kg, a scaling can be also set.
When setting up a flow measurement, a linearization curve suitable
for the structural conditions must be selected. Corresponding curves
such as venturi, triangular overflow, … are available here. In addition,
Main menu
Allocate sensor input
Deactivate measuring
point 2
Damping
Linearisation
