SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
1 – 97
Volume 1 7 Functional Safety
1
7.5.2 General Notes and Limitations
• The user-specific limits must be observed and the technical
specifications must not be exceeded. See operating instruc-
tions.
• The container geometry on which the source-detector calcula-
tion is based must not differ from the one at the mounted mea-
suring point. If there are any deviations, please contact
BERTHOLD TECHNOLOGIES.
• Only the analog 4-20mA current output signal may be used for
safety functions.
• The measuring signal may only be used by the control system
when the Safety Mode is enabled.
• The RS485 interface must be used exclusively for the mas-
ter-slave communication.
•The HART
®
multidrop mode is not allowed.
• If there are magnetic fields in the immediate vicinity of the
measuring point, then you have to make sure through appro-
priate tests that the magnetic field intensity does not affect the
measuring signal.
• Use only radiation sources with the isotope Co-60 or Cs-137.
• Only shieldings made by Berthold may be used.
• During operation, the source shielding may not be
–closed
– be changed in their position or removed
• It must be prevented that no additional absorber (e.g. steel
plates) get into the beam path, which were not considered for
commissioning.
• Any influence of adjacent radiometric measuring points should
be avoided. If in doubt, the measuring point arrangement has
to be discussed with BERTHOLD TECHNOLOGIES.
• Several detectors may be interconnected into a multi-detector
system. In an interconnection, only one detector may be con-
figured as a master detector.
• In a multi-detector system, the time constant must be
> 2 seconds.
• The user is responsible for the validation of the safety function.
• The following types of detectors can only be used when all
count rates within the measuring range are above 1000 cps.
– LB 480-13 (CrystalSENS 40/35)
– LB 480-14 (CrystalSENS 40/35 with water cooling)
– LB 480-15 (CrystalSENS 25/25)
– LB 480-16 (CrystalSENS 25/25 with water cooling)
These detectors can be operated only with detector code "0".
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