BERTHOLD TECHNOLOGIES LB 480, User Manual, Page: 403 / 450

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
3 – 403
Volume 3 5 Calibration
3

Select Live Display .
– The Operating Mode must show RUN .
– At Level or Density , the current target value must be dis-
played and must be alive *
– At Current OUT , the current target value must be dis-
played and must be alive *
*) Alive = the display must fluctuate around a mean
5.3.3 Test Run with Product
This test will give you the highest level of security, as it is performed
under real conditions. The test should be performed under operat-
ing conditions, if possible; i.e. any existing stirrer should run and a
gas pressure existing during operation should also be present
during the test. However, often this involves a lot of effort, so that
the options on site and the need have to be clarified first. In many
cases, water rather than product may be used for a test run and a
possible gas pressure can often be simulated with nitrogen. The dif-
fering density between the product and the substitute product used
for the test has to be taken into account.
Level

Fill the container. Move the container under operating condi-
tions from empty to full.

Record the measurement signal and verify this.
Substitute procedures such as closing the source when the con-
tainer is empty can be used only to a limited extent as a functional
test.
If substitute procedures are chosen, the restrictive conditions must
be carefully evaluated.
Limit switch

Control the limit level under operating conditions.

Record the response of the measurement and verify it.
Substitute procedures such as closing the source when the con-
tainer is empty can be used only to a limited extent as a functional
test.
If substitute procedures are chosen, the restrictive conditions must
be carefully evaluated.
Density measurement
A density measurement is best tested using sample values. To this
end, samples distributed over the measuring range should be taken
and these should be compared with the display value.
If the measuring area also covers the density of 1g/cm
3
, then water
may also be used for the test. If it is not possible to control different
densities within the measuring range, a one-point calibration can
alternatively be performed. Since only one point within the measur-
ing range is tested, it must be clarified whether this test is sufficient
for the application.
If in doubt, please ask the BERTHOLD TECHNOLOGIES Service for
support.