Product description
24
© SICK AG · Division Auto Ident · Germany · Subject to change without notice
8013796/UL20/2010-09-27
Operating Instructions
Laser Measurement Systems of the LMS500 Product Family
Chapter
3
In the example in
, the beam is fully incident on the object at least once during
each
scan. It will therefore be reliably detected if it has the necessary remission.
How to calculate the minimum object size:
Beam di distance between the measured points = minimum object size
For beam diameter and measured point spacing as a function of the distance from the
LMS see the diagram in
.
Important
•
In particular on the usage of the LMS for measured value output, it is necessary for a
reliable measurement that the beam is incident on the object several times. The
example shows the minimum size of an object. For a reliable measurement it is
important that the beam is incident on the object several times. Therefore an object
should be either larger than the minimum object size or the LMS as well as the object
should not move.
3.5.4
Contamination measurement
The LMS has an front screen for protection. This front screen can become contaminated.
The laser beam radiation emitted and received is reduced by the contamination. As a result
scanned objects are perceived with a lower remission than they actually have, or no longer
measured at all from a certain level of contamination.
For this reason the contamination is measured continuously while the device is in operation.
For a certain level of contamination, first a contamination warning is output; if the
contamination becomes worse, a contamination error is output and the LMS stops taking
measurements.
Depending on the application in which the LMS is used, you can choose between various
strategies for the contamination measurement.
P
ROJECT
TREE
, LMS…, P
ARAMETER
, C
ONTAMINATION
MEASUREMENT
.
•
inactive
No contamination measurement
•
highly available
Contamination warning and contamination error are only output on even contamination
of the front screen.
•
available
Contamination warning and contamination error are only output on partial
contamination of the front screen.
•
sensitive
Contamination warning and contamination error are output even with isolated
contamination.
Recommendation
The cleaner the application environment, the lower you can set the sensitivity for the
contamination measurement. The more exact the measured result must be, the higher you
should set the sensitivity of the contamination measurement.
Contamination warning and contamination error are indicated on the LEDs on the LMS (see
section 8.2 “Error displays of the LEDs” on page 65
). You can also read these states using
section 10.2.6 “Read contamination level” on page 86
and
).
A contamination error is also signalled on a digital or external output if this output is
configured for the status “Device Ready” (see
section 3.9.2 “Digital switching outputs” on
).
Summary of Contents for LMS500-20000 PRO Indoor
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