GR

© KROHNE 06/2002 7.02395.22.00

LS 5000 seriesVibration Level Switch

for liquids

Status: 10/99

Variable area flowmeters

Vortex flowmeters

Flow controllers

Electromagnetic flowmeters

Ultrasonic flowmeters

Mass flowmeters

Level measuring instruments

Communications technology

Engineering systems & solutions

Switches, counters, displays and recorders

Heat metering

Pressure and temperature

� Set-up without adjustment

� Integrated fault monitoring

� Unaffected by product variations in density, conductivity, dielectricconstant or viscosity

� Insensitive to foam, pressure and temperatures variations

� Insensitive to external vibrations

� Operating temperature up to 250°C (optional)

2

LS 5000 seriesVibration Level Switchfor liquid

Operating Principle

The tuning fork is piezoelectrically energisedand vibrates at its mechanical resonancefrequency of approx. 1200 Hz. The piezoel-ectric elements are fastened mechanicallyand are therfore not subject to temperatureshock limitations. When the tuning fork isimmersed in the product, the frequencychanges. This change is detected by theintegrated oscillator and converted into aswitching command.

The models LS 5100 and LS 5150 are short versions without extension, whereas LS 5200 and LS 5250 can be ordered withextension tubes.

The level switches LS 5150 and LS 5250have a polished surface especially suitablefor applications in hygienic industries.

Housing� Aluminium

(plastic coated)

� plastic

Electronics

� Non-contact switch� Floating relay output� Floating transistor

output� Two-wire current

output� Two-wire current

output acc. toNAMUR

� Overfill or dry-run protection

� Suitable for applications in confined spaces (fork length only 40mm)

� Electronics replaceable under process conditions

LS 5200/5250

LS 5100/5150

Process connection

� Thread G 3/4” A,3/4” NPT, G 1 Aand 1” NPT

� Flanges from DN 25or ANSI 1”

� Hygienic fittings

Tube extension

� up to 4000 mmlength

Tuning fork material

� Stainless steel 1.4435 (316L) also polished up toRa ≤ 0,5 µm

� Hastelloy C4 (2.4610)� ECTFE coated� Enamelled

3LS 5100 / LS 5200

LS 5000 series

Technical dataProcess conditionsProduct temperature (1.4435 / Hastelloy C4) -50....+250°C (-50....+302°F)Product temperature with temp. adapter of 1.4435 (option)• LS 5000 series of 1.4435 / Hastelloy C4 -50....+250°C (-50....482°F)• LS 5000 series enamelled -50....+200°C (-50....392°F)• LS 5000 series ECTFE coated -50....+150°C (-50....302°F)Operating pressure max 64 bar (928 psi)

Dep. on mechanical connectionProduct viscosity (dynamic) 0.2....10.000 mPasProduct density 0.7....2.5 g/cm3

MaterialsHousing PBT (Polyester), Aluminium (plastic coated)Tuning fork 1.4435 (316L) or 2.4610 (Hastelloy C4),

Hastelloy C4 enamelled, 1.4435 with ECTFE coatedFlanges 1.4435, 1.4435 with Hastelloy C4 plated,

enamelled steel, 1.4435 ECTFE coatedExtension tube 1.4435 (316L) or 2.4610 (Hastelloy C4),

Hastelloy C4 enamelled, 1.4435 with ECTFE coatedAdapters• Temperature adapter 1.4435• Gastight leadthrough (option) 1.4435 / glass (not ExD)LengthTuning fork 40 mmExtension tube (LS 5200 / 5250)• Steeel 1.4435, 2.4610 (Hastelloy C4) 150...4000 mm• Hastelloy C4 enamelled 150...1200 mm• 1.4435 ECTFE coated 150...3000 mmSurface quality (option)Standard (LS 5100 / 5200) Ra approx. ≤ 3.0 µmPolished (LS 5150 / 5250) Ra ≤ 1.5 µmHygienic version (3A/FDA) (LS 5150 / 5250) Ra ≤ 0.5 µmProcess connectionThread G 3/4 A, 3/4” NPT, G1A or 1” NPT PN 64Flange DIN ≥ DN 25, ANSI ≥ 1”Hygienic fittings• Bolting DN 40 PN 40• Tri-Clamp 1”, 11/2 ” PN 10• Cone DN 25 PN 40• Tuchenhagen Varivent DN 50 PN 10ElectronicsSW E60N (EX)Supply For connection to separator acc. to NAMUR, approx. 8.2 V• Open circuit voltage Approx. 8.2 V• Short-circuit current Approx. 8.2 mAOutput Two-wire NAMUR outputCurrent consumption• Characteristics falling ≥ 2.2 mA uncovered/ ≤1 mA covered• Characteristics rising ≤ 1 mA uncovered/ ≥ 2.2 mA covered• Fault signal ≤ 1 mASW E60Z (EX)Supply voltage 12...36 V DC (via signal conditioning instrument SU 501)Output Two-wire outputCurrent consumption Approx. 8 mA empty/ approx. 16 mA fullSW E60C,R,T (EX)Supply voltage 20...253 V AC, 50/ 60 Hz or 20...253 V DCOutput Contactless electronic switchInternal current Requirement approx. 3 mA (via load circuit)Load current Min. 10 mA; max. 400 mA Protection classDIN 40 050 IP 66 / IP 67Approvals As overfill protection in conformity with WHG (Germany)AccessoriesWelding socket For thread of 1.4435 with O-ring in front, optionally with

welding mark for defined fork alignment.

The responsibility as to the suitability, intended use and corrosion-resistance of the materials used intheir construction rests solely with the purchaser.

LS 5000 series

LS 5100 / LS 52004

Mounting instructions

Vertical installation from top, from bottom

Vibrations

Horizontal installation

Lateral load

Moisture Marking of welded socket

Switching point

Switching point

Top marking

Switching pointwith higherdensity

Switchingpoint

Switchingpoint

approx.13 mm

Switching pointwith lower density

recommended installation position for adhesive products:

Extreme vibrations and shocks cancause the extension tube to vibrate.Therefore provide a fastening or straining directly above the tuning fork to fasten the extension tube.

Make sure that thevibrating element is notsubjected to lateral for-ces. Mount the instru-ment at a location inthe vessel where nointerfering effects canoccur.The surface of thetuning fork should beparallel to the productmovement.

Turn the cable entries ofhorizontally mountedinstruments downwards toavoid moisture ingress.For this purpose the plastichousing can be rotated byapprox. 330°.For vertically installedinstruments, loop the cableconnected to the instru-ment housing downwardsso that rain and conden-sation water can drain off.

Thread starting point is defined. Remove therefore thesupplied seal from the thread. This seal is not requiredwhen using a welded socket.Screw the level switch into the welded socket. The welded socket has a notch. Weld this socket with thenotch facing upwards, or in the case of pipelines,aligned with the direction of flow.

Marking

5LS 5100 / LS 5200

LS 5000 series

Electrical connection

Two-wire NAMUR output(SW E60N)

SW E60N Ex

N A M U R( I E C 6 0 9 4 7 - 5 - 6 )

+

1 2

0,5 g / cm3

0,7 g / cm3

SW E60Z Ex

+

1 2

0,5 g / cm3

0,7 g / cm3

11-29V DC

Two-wire output(SW E60Z)

+ -

+ -

1 2

Switching ampfifieracc. toNAMUR(IEC 60947-5-6)

4321

A

1

+

2

-

Contactless electrical switch(SW E60C)

SW E60C

2 0 - 2 5 0 V A C / D Cm a x 4 0 0 m A

A

B

LN

L N

1 2

1 2

0,5 g / cm3

0,7 g / cm3

++

SW E60R

2 0 - 2 5 0 V A C2 0 - 7 2 V D C

A

BL N

1 2 3 4 5 6 7 8

0,5 g / cm3

0,7 g / cm3

3 4 5 6 7 8

+

Floating realy output(SW E60R)

1 2

Power supply:20 ... 253 V AC, 50/60 Hz20 ... 253 V DC(for further information, seeinstallation manual)

Power supply:20 ... 253 V AC, 50/60 Hz20 ... 72 V DC(for further information, seetechnical data)

6

LS 5000 series

LS 5100 / LS 5200

The responsibility as to the suitability, intended use and corrosion-resistance of the materials used intheir construction rests solely with the purchaser.

Floating transistor output(SW E60T)

SW E60T

1 0 - 5 5 V D C

1 PNP2 3 4 1 NPN2 3 4

A

B

0,5 g / cm3

0,7 g / cm3

m a x 4 0 0 m Ao u t

1 2 3 4

+

+ +

Power supply:10 … 55 V DC (for further information see the following connection examples as well as the technical data)

For direct control of relays, contactors,magnet valves, warning lights, horn, aswell al PLC inputs

NPN action PNP action

The transistor switches a second,galvanically isolated voltage source tothe binary input of a PLC or to anelectrical load. Trough differentconnection of the cunsumer (load).PNP or NPN action can be preset.

Connection examples

NPN action PNP action

The transistor switches the supply voltage ofthe oscillator to the binary input of a PLC or toan electrical load. Trough different connectionof the cunsumer (load). PNP or NPN actioncan be preset.

The transistor switches a second voltage source with the same referen-ce potential to the binary input of aPLC or to an electrical load. Troughdifferent connection of the cunsumer(load). PNP or NPN action can be preset.

NPN action PNP action

Control of alternating current loads

The transistor switches a galvanicallyseparated alternating voltage 10 … 42 V AC to a load.

LS 5100 / LS 5200

LS 5000 series

7

Dimensions – LS 5000 series

LS 5000 series

LS 5100 / LS 52008

Dimensions – LS 5000 series

LS 5100 / LS 5200

LS 5000 series

9

Dimensions – LS 5000 series

LS 5000 series

LS 5100 / LS 520010

Ordering CodeLS 5100/5200 Vibrating level switch for liquids

for LS 5100

for LS 5200

LS 5100 / LS 5200

LS 5000 series

11

Length of the extended probe for the LS 5200 only

Total length in mm

Length (L) mm(min. 150 mm; max. 4000 mm)

Table: Process Connection Type / Process Connection Size / Process Connection and fork material – for LS 5100/5200

LS 5000 series

LS 5100 / LS 520012

Ordering CodeLS 5150/5250 Vibrating level switch for liquids and for hygienic applications

Fork surface roughness : Ra < 1.5 µm or RA < 0.5 µm

for LS 5150

for LS 5250

LS 5100 / LS 5200

LS 5000 series

13

Length of the extended probe for the LS 5250 only

Total length in mm

Length (L) mm(min. 150 mm; max. 4000 mm)

Table 1: Process Connection Type / Process Connection Size / Process Connection and fork material – for LS 5150/5250