KROHNE LS-4100 User Manual
Installation and
operating instructions
LS 4100/LS 4150
“Level-Safe”
Vibrating Level Switch
©
KROHNE 03/2002 7.02241.21.00
GR
Variable area flowmeters
Vortex flowmeters
Flow controllers
Electromagnetic flowmeters
Ultrasonic flowmeters
Mass flowmeters
Level measuring instruments
Communications engineering
Engineering systems & solutions
Switches, counters, displays and recorders
Heat metering
Pressure and temperature
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Safety information 2
Product liability and warranty 2
CE / EMC / Standards / Approvals 2
1 Product description 3
1.1 Function and configuration 3
1.2 Principle of operation 3
1.3 Technical data 4
1.4 Dimensions 6
2 Mounting 8
2.1 Mounting instructions 8
3 Electrical connection 10
3.1 Connection instructions 10
3.2 Wiring plan 11
4 Setup 14
4.1 Switching status 14
4.2 Switching point 14
4.3 Functions chart 14
5 Diagnostics 15
5.1 Function test 15
5.2 Replacement of the electronics 16
5.3 Maintenance 16
If you need to return a device for testing
or repair to KROHNE 17
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Please read this manual carefully, and also take note of country-specific installation standards
(e.g. the VDE regulations in Germany) as well as prevailing safety regulations and accident
prevention rules. For safety and warranty reasons, any internal work on the instruments, apart
from that involved in normal installation and electrical connection, must be carried out only by
qualified KROHNE personnel.
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Responsibility for suitability and intended use of these instruments rests solely with the operator.
Improper installation and operation of the instruments may lead to loss of warranty.
In addition, the ”General conditions of sale” forming the basis of the purchase contract are
applicable.
If instruments need to be returned to KROHNE, please note the information given on the last-butone page of these Instructions. KROHNE regret that they cannot repair or check your instrument
unless accompanied by the completed form sheet.
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LS 4100/LS 4150 meet the protection requirements of
conjunction with
and
93/68/EEC
2
LS 4100/LS 4150
EN 50081-1
in conjunction with
(1992) and
EN 61010-1,
EN 50082-2
and also bear the
Directive 89/336/EEC
(1995), and
Directives 73/23/EEC
CE symbol
in
.
03/2002
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1.1 Function and configuration
LS 4100/LS 4150 detect levels of liquids with a viscosity of 0.2 up to 10.000 mPa s and a density
of ≥ 0.6 g/cm3. Modular construction enables their use in machines, plants, vessels and pipelines,
even in applications severely limited in space. Typical applications are overfill and dry run
protection.
LS 4100 is optionally available with threads G 1 A and 1" NPT. The stainless steel housing
(1.4571) is in protection class IP 67.
LS 4150 is mainly suitable for level detection in the food processing and pharmaceutical industry.
Due to the polished sensor surface (Ra ≤ 0.5 µm or Ra ≤ 1.5 µm) bacteria have no chance to
collect. LS 4150 is also suitable for CIP and SIP cleaning. Many different hygienic fittings such as
cone with compression nut, Tri-Clamp 1" and 2", bolting, Tuchenhagen VARIVENT or special
hygienic connections are available.
Due to the simple and rugged measuring system, LS 4100/LS 4150 is virtually unaffected by the
chemical and physical properties of the liquid. They work even under unfavourable conditions
such as turbulence, air bubbles, foam generation, build-up or varying products. An adjustment to
the medium is not necessary.
The electronics can be exchanged without problems. LS 4100/LS 4150 must not be removed.
LS 4100/LS 4150 has an integrated test switch which can be activated magnetically. It tests the
sensor electronics and the connected instruments.
1.2 Principle of operation
The tuning fork is piezoelectrically energised and vibrates at its mechanical resonance frequency
of approx. 400 Hz. This frequency is transferred to the electronics of LS 4100/LS 4150. When the
tuning fork is submerged in the product, the frequency changes. This change is detected by the
integrated oscillator and converted into a switching command.
By changing of poles of the supply voltage, the switching condition can be defined (max.
detection/min. detection). With the transistor version, PNP or NPN action can be preset by a
different connection of the consumer (load).
The integrated fault monitoring detects:
interruption of the connection cable to the piezo elements
•
extreme wear on the tuning fork
•
break of the tuning fork
•
no vibration
•
If one of the stated failures is determined or in case of voltage loss, the electronics takes on a
defined switching condition, e.g. the output transistor blocks.
LS 4100/LS 4150 3
03/2002
1.3 Technical data
Housing
Housing material stainless steel 1.4571/ 316Ti
Protection IP 67
Torque on the hexagon 80 Nm
Plug connection 4-pole plug
with status indication (illuminated ring)
Terminals max. 1 x 1.5 mm
Process connection
LS 4100
- thread G 1 A or 1" NPT
- material 1.4571 (316Ti)
LS 4150
- thread G 1 A or 1" NPT
- cone DN 25
- Tri-Clamp 1" or 2"
- bolting DN 40 or DN 50
- Tuchenhagen Varivent
- hygienic connection with compression nut F40 PN 25
- hygienic connection with tension flange DN 32 PN 25
Tuning fork
Material 1.4581 (stainless steel)
Weight
Total weight approx. 0.4 kg
Ambient conditions
Ambient temperature on the housing -40…+70°C
Storage and transport temperature -40…+70°C
Product temperature -40…+150°C
Ambient temperature on
the housing
2
Product
temperature
Operating pressure
max. 40 bar
Product
Viscosity 0.2…10.000 mPa s
Density
4
LS 4100/LS 4150
> 0.6 g/cm3
03/2002
Electronics - General
Integration time approx. 0.5 s
Measuring frequency approx. 400 Hz
Hysteresis approx. 4 mm with vertical installation
Control lamp illuminated ring with two-colour
LED for status indication
green – output conductive
red – output blocks
Electronics - Transistor output (SW E72 T)
Power supply 10 … 55 V DC
Power consumption max. 0.5 W
Output floating transistor output
NPN/PNP selectable
Load current max. 400 mA (output - overload and
permanently short-circuit proof)
Voltage loss max. 1 V
Turn-on voltage max. 55 V DC
Blocking current < 10 µA
Protection class II
Overvoltage category III
Mode A - max. detection or overfill protection
B - min. detection or dry run protection
A/B-mode by polarisation of the power supply
Electronics - contactless electronic switch (SW E72 C)
Power supply 20 … 250 V AC, 50/60 Hz or 20 … 250 V DC
Output contactless electronic switch
Internal current requirement approx. 3 mA (via the load circuit)
Load current min. 10 mA
max. 400 mA
(at I > 300 mA the ambient temperature can be
max. 60°C) max. 4 A up to 40 ms
Protection class I
Overvoltage category III
Modes A/B-mode by electrical connection
in the connection plug
A - max. detection, overfill protection
B - min. detection, dry run protection
CE conformity
LS 4100/LS 4150 vibrating level switches meet the protective regulations of EMC
(89/336/EWG) and NSR (73/23/EWG). Conformity has been judged acc. to the following
standards:
EMC Emission EN 50 081 - 1: 1992
Susceptibility EN 50 082 - 2: 1995
NSR EN 61 010 - 1: 1993
LS 4100/LS 4150 5
03/2002
1.4 Dimensions
LS 4100
Ø 40
265
Ø 29
129
100
25
30,5
Ø 60
SW41
G1A or 1”NPT
Optional with weld mark
Front side
O-ring seal
6
LS 4100/LS 4150
03/2002
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