BERTHOLD LB 471 User Manual
PROCESS CONTROL
Level Switch
Mini-Switch LB 471
2
Application
The BERTHOLD level switch is used in all branch-
es of industry, including the food industry. This
measurement system is applicable where one or
more alarm levels of liquids or bulk solids have to
be monitored. In fact, the BERTHOLD level switch
is suitable for installation on all types of vessels or
bunkers like storage tanks, hot-storage bunkers,
vessels with agitators, high-pressure reactors, cy-
clones or feeder chutes.
The Function
The operation of the measuring system is based on
the application of the radiometric measuring
principle, i.e. the physical law of absorption of
gamma radiation as it passes through matter.
This measuring principle has been proved suc-
cessful on the most difficult applications for many
years now.
Benefits
contactless
n
no abrasion
n
maintenance free
n
fail safe
n
long life time
n
no mechanical modifications
to the vessel required
1
Engineering data
Dimensions of the vessel at the
measuring position
n
Thickness and density of
each wall to be irradiated
n
Density of the product
to be measured
n
Gas density under operating condi-
tions in high pressure systems
n
Max. ambient temperature
outside the vessel
n
Dimensional drawings of agitators
or other internals in the vessel
n
required Ex-proof class
3
2
An arrangement of a level alarm switch is shown
in picture 1. The shielded radiation source is in-
stalled outside the vessel at the height at which the
alarm must be indicated. The radiation detec-
tor , is mounted at the same height on the op-
posite side of the vessel. The detector signal is
transmitted via a two-core standard cable to the
evaluation unit .
3
2
1
Picture 1
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