SICK LFV200 Manual De Instrucciones página 13

2.2 Principle of operation
Application area
LFV200 is a point level sensor with tuning fork
for point level detection.
It is designed for industrial use in all areas of
process technology and is used in liquids.
Function monitoring
The electronics module of LFV200 continuously
monitors the following criteria via frequency
evaluation:
•
Strong corrosion or damage on the tuning
fork
•
Loss of vibration
•
Line break to the piezo drive
If a malfunction is detected or in case of voltage
supply, the electronics takes on a defined swit-
ching status, i.e. the output is open (safe state).
Functional principle
The tuning fork is piezoelectrically energised
and vibrates at its mechanical resonance
frequency of approx. 1100 Hz. When the tuning
fork is submerged in the product, the frequency
changes. This change is detected by the integ-
rated electronics module and converted into a
switching command.
2.3 Storage and transport
Packaging
Your instrument was protected by packaging
during transport. Its capacity to handle normal
loads during transport is assured by a test
based on ISO 4180.
The packaging consists of cardboard. This
material is environment-friendly and recyclable.
Dispose of the packaging material via specia-
lised recycling companies.
3 Mounting
3.1 General instructions
Switching point
Generally, LFV200 can be mounted in any posi-
tion. Just install the instrument so that the tuning
fork is at the height of the requested switching
point. Keep in mind that the switching point can
vary depending on the installation position.
The switching point refers to the medium water
LFV200 • IO-Link
(1 g/cm³/0.036 lbs/in³). Please keep in mind that
the switching point of the instrument shifts when
the medium has a density differing from water.
2
1
3
Abb. 9: Vertical mounting
1 Switching point in water
2 Switching point with lower density
3 Switching point with higher density
1
2
Abb. 10: Horizontal mounting
1 Switching point
2 Switching point (recommended mounting position,
particularly for adhesive products)
Moisture
Abb. 11: Measures against moisture ingress
Handling
Do not hold LFV200 on the tuning fork. Bending
the vibrating element will destroy the instrument.
3.2 Mounting instructions
Welded socket
For threaded versions of LFV200 in combination
3 Mounting
13