IFM Electronic LK81-Serie Bedienungsanleitung Seite 27

Functional overview
• The unit can be installed in tanks of different sizes. Mounting ele-
ments may also be placed in the active measurement zone. Please
adhere to the mounting instructions (→ page 29).
• The sensitivity and the mode of detection of the unit can be set in
order to adjust to different media. This allows the reliable detection
of media with a very low dielectric constant (e.g. oil).
• The automatic adjustment serves for easy and secure set-up. By
means of the adjustment operation (→ page 35) the unit can be
adjusted to the tank being monitored.
Please note:
The adjustment operation is compulsory to ensure the reliable oper-
ation of the level sensor! Without adjustment,
the unit will not change into the operating mode!
• The unit features an integrated, independent overflow
protection. A measuring segment of the sensor probe (measuring
segment OP) is selected as overflow protection point OP via the
user menu and assigned to the output OUT-OP. The response time
for the overflow alarm: typ. 450 ms, max. 720 ms.
The selected measuring segment is at the same time used for
adjustment. Therefore, please adhere to the required minimum dis-
tances of this segment to the tank wall, tank cover and mounting
adapter (→ page 29).
• The unit displays the current level and switches the outputs in
accordance with the set output configuration
The sensor offers 2 evaluation modes:
A Switching mode (factory preset)
B Binary mode
- A: In the switching mode the unit signals values that exceed or
do not reach the limit values set via the operating switching
outputs (OUT1, OUT2, OUT3). The switching function, switch
point and reset point can be set via the user menu.
- B: In the binary mode the outputs OUT1 ... OUT4 indicate the
level as a 8-4-2-1 binary code. Thus a 16-step quasi-analogue
evaluation with a resolution of max. 6.25% of the measuring
range is available (table of values → page 42).
is displayed and
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