KROHNE LS 4100 EN - Manual (Page 15)

03/2002 LS 4100/LS 4150 15
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5.1 Function test
LS 4100/LS 4150 are equipped with an
integrated test switch which can be activated
magnetically. Proceed as follows to test the
instrument:
•
Make sure that the tuning fork is
uncovered.
•
Hold the test magnet (accessory) to the
magnet symbol on the instrument housing
(see fig. 5.1). The test magnet simulates a
covering of the tuning fork. If the tuning fork
is uncovered, the signal lamp of the level
switch changes status. The electronics and
the switching output of the level switch are
checked now. Note that the connected
instruments will be activated during the
test.
If, despite several tests with the test magnet,
LS 4100/LS 4150 does not switch over, check
the plug connection and the connection cable
and test the instrument again. If there is no
switching function, the electronics is defective.
In this case you have to replace the electronics
(see "5.2 Replacement of the electronics") or
send the instrument to our repair department.
Note:
It is absolutely necessary that you remove the
test magnet after the test from the instrument
housing.
Fig. 5.1