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Vibracon LVL-B1
Technical Information
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Pepperl+Fuchs Vibracon LVL-B1, Vibracon LVL-B2 Technical Information

Technical Information TI 389O/98/en/09.05 188839 09/05 00
Vibracon LVL-B1, LVL-B2
Level limit switch Robust vibration limit switch for bulk solids, also for dust incendive hazard areas
Application
The various designs means the device has a wide range of applications. Certificates are also available for use in dust incendive hazard areas.
LVL-B1 compact design (250 mm (10 in)) as vibrating rod for installation in any direction
LVL-B2 vibrating rod with extension pipe (500 mm/1000 mm/1500 mm/20 in/40 in/ 60 in) for installation in any direction
Typical applications: cereals, coffee beans, sugar, animal feed, rice, detergents, dye powder, chalk, gypsum, cement, sand, plastic granules.
Features
• No calibration: easy commissioning (plug and play)
• Insensitive to build-up: maintenance­free operation
• No mechanically moving parts: no wear, long operating life
• Sensor material 316L: hardly any abrasion even with building materials
• F16 plastic housing with cover with sight glass: switch status visible from outside
• F18 aluminium housing also available
• Insensitive to external vibration and flow noises
• Also available with explosion protection ATEX II 1/3 D, FM or CSA approval
Table of contents
Vibracon LVL-B1, LVL-B2
Function and system design. . . . . . . . . . . . . 3
Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Cable specifications. . . . . . . . . . . . . . . . . . . . 4
Cable entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Measured variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Measuring range (application) . . . . . . . . . . . . . . . . . . . . . 4
Input signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Measuring frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Galvanic isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Switch behaviour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power-on behaviour. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Fail-safe mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Switching delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ex specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electronic insert FEM 22 (E5) . . . . . . . . . . . . 5
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connectable load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electronic insert FEM 24 (WA) . . . . . . . . . . . 6
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connectable load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating conditions. . . . . . . . . . . . . . . . . . . 7
Installation instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . 7
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Climate class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . 7
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal shock resistance . . . . . . . . . . . . . . . . . . . . . . . . . 8
Limiting medium pressure range. . . . . . . . . . . . . . . . . . . . 8
State of aggregation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Grain size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Bulk density. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lateral load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mechanical construction . . . . . . . . . . . . . . . . 9
Design, dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Human interface . . . . . . . . . . . . . . . . . . . . . . 11
Display elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating elements of electronic inserts. . . . . . . . . . . . . 11
Sediment detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Certificates and approvals. . . . . . . . . . . . . . 12
CE mark, declaration of conformity. . . . . . . . . . . . . . . . . 12
Ex approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Type of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Other standards and guidelines . . . . . . . . . . . . . . . . . . . 12
Ordering information . . . . . . . . . . . . . . . . . . 13
Product structure LVL-B1 . . . . . . . . . . . . . . . . . . . . . . . . 13
Product structure LVL-B2 . . . . . . . . . . . . . . . . . . . . . . . . 13
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . 14
High pressure sliding sleeve . . . . . . . . . . . . . . . . . . . . . . 14
Sliding sleeve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Supplementary documentation. . . . . . . . . . 15
Operating instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safety informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Directive conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Supplementary informations . . . . . . . . . . . . . . . . . . . . . . 15
Date of issue 09/29/05 188839
2
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Vibracon LVL-B1, LVL-B2

Function and system design

Function and system design
Measuring principle A piezoelectric drive excites the vibrating rod of Vibracon LVL-B1, LVL-B2 to its resonance
frequency. If medium covers the vibrating rod, the rod's vibrating amplitude changes (the vibration is damped). Vibracon’s electronics compare the actual amplitude with a target value and indicates whether the vibrating rod is vibrating freely or whether it is covered by medium.
A
t
A = amplitude
Measuring system Vibracon LVL-B* is a compact electronic switch.
Thus, the entire measuring system only consists of:
• Vibracon LVL-B1 or LVL-B2 with FEM 22 (E5) or FEM 24 (WA) electronic insert
• a supply point and
• the connected control systems, switching units, signalling systems (e. g. lamps, horns, PCS, PLC, etc.)
X
E
A
t
E
X
…
+–
U –
Date of issue 09/29/05 188839
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
U –
~
3

Cable specifications

Cable specifications
Use a shielded cable in the event of strong electromagnetic radiation.
Immunity to temperature change of connec ti ng cable
The connecting cables must withstand the ambient temperature +15 K.
Cable entries M20 x 1,5 (cable gland); ½ NPT; G½

Input

Measured variable Level (according to the mounting location and the overall length)
Vibracon LVL-B1, LVL-B2
Measuring range (application)
Input signal Probes covered
Measuring frequency 700 Hz ... 800 Hz
The measuring range depends on the mounting location of Vibracon LVL-B* and the length of the pipe extension selected. The pipe extension is available in the following lengths: 500 mm, 1000 mm, 1500 mm, 20 in, 40 in, 60 in.
! small amplitude
Probe not covered
! large amplitude

Output

Galvanic isolation FEM 22 (E5): between sensor and power supply
FEM 24 (WA): between sensor, power supply and load
Switch behaviour binary
Power-on behaviour When switching on the power supply the output is set to "signal on alarm".
After a maximum of 3 s it switches to the correct output signal.
Fail-safe mode Minimum/maximum quiescent current safety can be switched at electronic insert.
Max. = maximum safety: When the vibrating rod is covered, the output switches in the direction of the signal on alarm. Used for overfill protection for example.
Min. = minimum safety: When the vibrating rod becomes exposed, the output switches in the direction of the signal on alarm. Used for empty running protection for example.
Switching delay 0.5 s when the sensor is covered, 1 s when the sensor is exposed
Ex specifications FEM 22 (E5), FEM 24 (WA):
Explosion protection for explosive dust-air mixtures: Dust-Ex, DIP
4
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Date of issue 09/29/05 188839
Vibracon LVL-B1, LVL-B2

Electronic insert FEM 22 (E5)

Electrical connection Three-wire direct current connection
Preferred in conjunction with programmablelogic controllers (PLC), DI modules as per EN 61131-2.
Positive signal at electronics switch output (PNP); Output blocked at level limit.
Electronic insert FEM 22 (E5)
FEM 22 (E5)
13
F
0.5 A
2
(+)
R
e. g. Relay PLC
–
L+ L–
…
U – 10 V ... 45 V (DC)
Output signal
I
L
< 100 µA
= load current
(switched throuht)
= residual current
(blocked)
Safety connection
Max.
Level Output signal LEDs
L+ +
1 3
< 100 µA
1 3
= lit
= not lit
Min.
L+ +
1 3
< 100 µA
1 3
Signal on alarm Output signal on power failure or in the event of device failure: < 100 µA
Connectable load • Load switched via transistor and separate PNP connection
• Load current: max. 45 V (cyclical overload and short-circuit protection), continuous max. 350 mA
• Residual current: < 100 µA (for blocked transistor)
• Capacitive load: max. 0.5 µF for 45 V, max. 1.0 µF for 24 V
• Residual voltage: < 3 V (for transistor switched through)
green yellow
I
L
I
L
Power supply DC voltage 10 V … 45 V
Ripple max. 5 V, 0 Hz … 400 Hz Current consumption max. 15 mA Power consumption max. 0.68 W Reverse polarity protection Separation voltage: 2.2 kV Overvoltage protection: overvoltage category III
Date of issue 09/29/05 188839
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
5

Electronic insert FEM 24 (WA)

Electronic insert FEM 24 (WA)
Electrical connection Universal current connection with relay output
Power supply: Please note the different voltage rangesfor AC
and DC. Output: When connecting a device withhigh inductance,
provide a spark arresterto protect the relay contact.
A fine-wire fuse (depending on theload connected) protects the relaycontact in the event of a short-circuit.
Both relay contacts switch simultaneously. DPDT (double pole double throw)
* When jumpered, therelay output works with
NPN logic.
** see below "Connectable load"
F
0.5 A
Vibracon LVL-B1, LVL-B2
FEM 24 (WA)
12 345 6 78
*
!
Note!
Please note the different voltage ranges for direct and alternating current.
U ~ 19 V ... 253 V (AC)
Output signal
= relay energised
Safety connection
= relay de-energised
= lit
Max.
= not lit
Min.
Signal on alarm Output signal in event of power failure: relay de-energised
NO
C
a
u
L1
NL–PE
L+
(Ground)
…
Level Output signal LEDs
**
U – 19 V ... 55 V (DC)
435 768
435 768
435 768
435 768
NC r
…
NO
C
a
u
**
green yellow
NC r
Connectable load • Loads switched via 2 floating change-over contacts.
• I~ max. 6 A, U~ max. 253 V; P~ max. 1500 VA, cos ϕ = 1, P~ max. 750 VA, cos ϕ > 0.7;
• I– max. 6 A to 30 V, I– max. 0.2 A to 125 V.
• The following applies when connecting a functional extra-low voltage circuit with double insulation as per IEC 1010: sum of voltages of relay output and power supply max. 300 V
Power supply Alternating voltage 19 V… 253 V, 50/60 Hz or DC voltage 19 V … 55 V
Power consumption max. 1.3 W Reverse polarity protection Separation voltage: 2.2 kV Overvoltage protection: overvoltage category III
6
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Date of issue 09/29/05 188839
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