LS 5000 series Vibration Level Switch for liquids

Transcription

1 Vibration Level Switch for liquids Set-up without adjustment Integrated fault monitoring Unaffected by product variations in density, conductivity, dielectric constant or viscosity Insensitive to foam, pressure and temperatures variations Insensitive to external vibrations Operating temperature up to 250 C (optional) Status: 10/99

2 Vibration Level Switch for liquid Overfill or dry-run protection Suitable for applications in confined spaces (fork length only 40mm) Electronics replaceable under process conditions Operating Principle The tuning fork is piezoelectrically energised and vibrates at its mechanical resonance frequency of approx Hz. The piezoelectric elements are fastened mechanically and are therfore not subject to temperature shock limitations. When the tuning fork is immersed in the product, the frequency changes. This change is detected by the integrated oscillator and converted into a switching command. The models LS 5100 and LS 5150 are short versions without extension, whereas LS 5200 and LS 5250 can be ordered with extension tubes. The level switches LS 5150 and LS 5250 have a polished surface especially suitable for applications in hygienic industries. Housing Aluminium (plastic coated) plastic Process connection Thread G 3 /4 A, 3/4 NPT, G 1 A and 1 NPT Flanges from DN 25 or ANSI 1 Hygienic fittings LS 5200/5250 Electronics Non-contact switch Floating relay output Floating transistor output Two-wire current output Two-wire current output acc. to NAMUR LS 5100/5150 Tube extension up to 4000 mm length Tuning fork material Stainless steel (316L) also polished up to Ra 0,5 µm Hastelloy C4 (2.4610) ECTFE coated Enamelled 2

3 The responsibility as to the suitability, intended use and corrosion-resistance of the materials used in their construction rests solely with the purchaser. Technical data Process conditions Product temperature ( / Hastelloy C4) C ( F) Product temperature with temp. adapter of (option) LS 5000 series of / Hastelloy C C ( F) LS 5000 series enamelled C ( F) LS 5000 series ECTFE coated C ( F) Operating pressure max 64 bar (928 psi) Dep. on mechanical connection Product viscosity (dynamic) mpas Product density g/cm 3 Materials Housing PBT (Polyester), Aluminium (plastic coated) Tuning fork (316L) or (Hastelloy C4), Hastelloy C4 enamelled, with ECTFE coated Flanges , with Hastelloy C4 plated, enamelled steel, ECTFE coated Extension tube (316L) or (Hastelloy C4), Hastelloy C4 enamelled, with ECTFE coated Adapters Temperature adapter Gastight leadthrough (option) / glass (not ExD) Length Tuning fork 40 mm Extension tube (LS 5200 / 5250) Steeel , (Hastelloy C4) mm Hastelloy C4 enamelled mm ECTFE coated mm Surface quality (option) Standard (LS 5100 / 5200) Ra approx. 3.0 µm Polished (LS 5150 / 5250) Ra 1.5 µm Hygienic version (3A/FDA) (LS 5150 / 5250) Ra 0.5 µm Process connection Thread G 3 /4 A, 3 /4 NPT, G1A or 1 NPT PN 64 Flange DIN DN 25, ANSI 1 Hygienic fittings Bolting DN 40 PN 40 Tri-Clamp 1, 1 1 /2 PN 10 Cone DN 25 PN 40 Tuchenhagen Varivent DN 50 PN 10 Electronics SW 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 ma Output Two-wire NAMUR output Current consumption Characteristics falling 2.2 ma uncovered/ 1 ma covered Characteristics rising 1 ma uncovered/ 2.2 ma covered Fault signal 1 ma SW E60Z (EX) Supply voltage V DC (via signal conditioning instrument SU 501) Output Two-wire output Current consumption Approx. 8 ma empty/ approx. 16 ma full SW E60C,R,T (EX) Supply voltage V AC, 50/ 60 Hz or V DC Output Contactless electronic switch Internal current Requirement approx. 3 ma (via load circuit) Load current Min. 10 ma; max. 400 ma Protection class DIN IP 66 / IP 67 Approvals As overfill protection in conformity with WHG (Germany) Accessories Welding socket For thread of with O-ring in front, optionally with welding mark for defined fork alignment. 3

4 Mounting instructions Vertical installation from top, from bottom Horizontal installation Switching point Switching point with lower density Switching point approx. 13 mm Switching point with higher density Switching point recommended installation position for adhesive products: Switching point Top marking Vibrations Lateral load Extreme vibrations and shocks can cause the extension tube to vibrate. Therefore provide a fastening or straining directly above the tuning fork to fasten the extension tube. Make sure that the vibrating element is not subjected to lateral forces. Mount the instrument at a location in the vessel where no interfering effects can occur. The surface of the tuning fork should be parallel to the product movement. Moisture Turn the cable entries of horizontally mounted instruments downwards to avoid moisture ingress. For this purpose the plastic housing can be rotated by approx For vertically installed instruments, loop the cable connected to the instrument housing downwards so that rain and condensation water can drain off. Marking of welded socket Marking Thread starting point is defined. Remove therefore the supplied seal from the thread. This seal is not required when using a welded socket. Screw the level switch into the welded socket. The welded socket has a notch. Weld this socket with the notch facing upwards, or in the case of pipelines, aligned with the direction of flow. 4

5 Electrical connection Two-wire NAMUR output (SW E60N) SW E60N Ex Two-wire output (SW E60Z) SW E60Z Ex NAMUR (IEC ) + 0,5 g / cm V DC 0,5 g / cm ,7 g / cm ,7 g / cm Switching ampfifier acc. to NAMUR (IEC ) 1 A Contactless electrical switch (SW E60C) Floating realy output (SW E60R) SW E60C SW E60R + L V AC/DC max 400mA + L N N A 12 0,5 g / cm V DC V AC + L N A B 0,5 g / cm 3 0,7 g / cm B 0,7 g / cm Power supply: V AC, 50/60 Hz V DC (for further information, see installation manual) Power supply: V AC, 50/60 Hz V DC (for further information, see technical data) 1 2 5

6 Floating transistor output (SW E60T) V DC SW E60T PNP NPN + + out max 400mA A 0,5 g / cm 3 The responsibility as to the suitability, intended use and corrosion-resistance of the materials used in their construction rests solely with the purchaser. Power supply: V DC (for further information see the following connection examples as well as the technical data) B 0,7 g / cm 3 For direct control of relays, contactors, magnet valves, warning lights, horn, as well al PLC inputs Connection examples NPN action PNP action NPN action PNP action NPN action PNP action The transistor switches the supply voltage of the oscillator to the binary input of a PLC or to an electrical load. Trough different connection of the cunsumer (load). PNP or NPN action can be preset. Control of alternating current loads The transistor switches a second, galvanically isolated voltage source to the binary input of a PLC or to an electrical load. Trough different connection of the cunsumer (load). PNP or NPN action can be preset. The transistor switches a second voltage source with the same reference potential to the binary input of a PLC or to an electrical load. Trough different connection of the cunsumer (load). PNP or NPN action can be preset. The transistor switches a galvanically separated alternating voltage V AC to a load. 6

7 Dimensions LS 5000 series 7

8 Dimensions LS 5000 series 8

9 Dimensions LS 5000 series 9

10 Ordering Code LS 5100/5200 Vibrating level switch for liquids for LS 5100 for LS

11 Length of the extended probe for the LS 5200 only Total length in mm Length (L) mm (min. 150 mm; max mm) Table: Process Connection Type / Process Connection Size / Process Connection and fork material for LS 5100/

12 Ordering Code LS 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

13 Length of the extended probe for the LS 5250 only Total length in mm Length (L) mm (min. 150 mm; max mm) Table 1: Process Connection Type / Process Connection Size / Process Connection and fork material for LS 5150/