BERTHOLD TECHNOLOGIES LB 480, User Manual

Page: 103 / 450

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
1 – 103
Volume 1 7 Functional Safety
1
7.9.1.1
Limit Switch Application
The function in the Limit Switch application can be checked by con-
trolling the response level in the course of a filling process. If filling
is not feasible, the measuring system must be triggered to respond
by an appropriate simulation of the level or the physical measuring
effect.
7.9.1.2
Level Application
In the Level application, the function can be checked in the following
manner:
1. Source open, container empty ? it must be possible to check
the zero point.
2. Source closed, container empty ? measured value of the initial
start-up must be reached under the same conditions.
7.9.1.3
Density Application
In the Density application, the function can be checked only by a
reference liquid where we know the density. An example would be
filling the measuring path with water. If this is not possible, a ref-
erence sample must be analyzed in the laboratory and its result has
to be compared with the results of the measuring device.
In general, a 2-point tests leads to a higher safety level. A second
point should have a fairly large distance from the first point. We rec-
ommend a difference between both points of >30% of the measur-
ing range.
7.10
Repair
Repairs of the SENSseries LB 480 may be carried out at the manu-
facturer's works only.
7.10.1 Software Update
A software update must be carried out only by personnel authorized
by BERTHOLD TECHNOLOGIES.