levelprox
non-invasive ultrasonic level sensor
LPRE-M30-AP6X2-H1141
Short description
levelprox
sensors detect liquids through the wall of a container. They generate a high
frequency ultrasonic pulse whose echo is detected and evaluated by the sensor. The
sensor compares the detected echo curve with the curves taught during teach-in,
representing a filled and an empty container and sets its output accordingly.
Two operation modes can be adjusted via the TEACH line or the TEACH adapter
VB2-SP1:
1. In the
reverberation mode,
the reflection of the inner container wall adjacent to the
sensor is evaluated. Air bubbles or solid particles in the medium hardly affect the
sensor, whereas residues on the inner container wall will induce the sensor to switch.
2. In the
echo mode
, the sound reflected by the inner container wall opposite the
sensor is evaluated. Residues on the interior of the container do not affect the sensor.
However, if the container incorporates stirring devices or if the medium is
contaminated or contains air bubbles, problems can occur in this mode.
Sensing conditions
Container
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– Min. wall thickness:
1 mm
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–
–
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– Max. wall thickness:
15 mm
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–
–
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– Min. container diameter:
100 mm
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– Max. container diameter: any (reverberation mode)
2000 mm (echo mode)
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– Material:
steel, stainless steel, glass, other materials on request
Media
Water, aqueous solutions, oils (e.g. hydraulic oil), other media on request
Sensor mounting via the holding device LP-MZ-M30-SB
For sensor mounting use the holding device that can either be welded or attached to the
container wall via the retaining straps (see accessories shown below). Effective and low-
loss coupling of the ultrasound to the container wall is a precondition for error-free sensor
function. This can only be ensured, if the coupling point on the container wall is clean.
Therefore it is necessary to remove old paint, rust or grease prior from this point prior to
mounting the sensor.
1. Weld or attach the holding device to the container wall using the retaining straps.
2. Attach a thin layer of the silicone grease OKS 1110 to the sonic transducer of sensor
(see drawing).
3. Turn the sensor into the holding device manually until the sonic transducer touches the
container wall (you will feel a slight resistance).
4. In order to ensure a constant pressing force, the spring mounted sonic transducer
must be pressed into the sensor. For this, continue to screw-in the sensor until the
rigid frame of the transducer touches the counter wall (you will experience a stronger
resistance). Stop turning in the sensor to prevent damage.
Connection and mounting accessories
– LP-MZ-M30-SB
Ident.-no. 6900377
weldable holding device
– LP-MZ-M30-B250
Ident.-no. 6900378
retaining strap 2.5 m incl. 2 turnbuckles
– LP-MZ-M30-B500
Ident.-no. 6900379
retaining strap 5 m incl. 2 turnbuckles
– LP-MZ-M30-B1000
Ident.-no. 6900380
retaining strap10 m incl. 2 turnbuckles
– WAK4-2/P00
Ident.-no. 8007046
connector M12 x 1
– VB2-SP1
Ident.-no. 6999084
Teach adapter
36/5
67
79
LED
M30 x 1,5
15
7
M12 x 1
+
ext. teach
2 WH
4 BK
1 BN
3 BU
M30 x 1,5
30
10,5
50
42,5
50
70
4
retaining strap
levelprox
sensor
holding device
Sonic
transducer
