Liquid Level Switches According to the Tuning Fork Principle measuring monitoring analysing N Repeatability: ± mm pmax: 45 bar tmax: 30 C, 50 C (for CIP process) Connections: Pipe screw joints, NPT, Flange, hygienic thread Material: Stainless steel.4404 Viscosity: max. 5000 mm /s No moving parts Insensitive to plant vibrations ATEX version 03-00 KOBOLD companies worldwide: ARGENTINA, AUSTRIA, BELGIUM, CANADA, CHILE, CHINA, COLOMBIA, CZECHIA, FRANCE, GERMANY, GREAT BRITAIN, INDIA, IRAN, INDONESIA, ITALY, MALAYSIA, MEXICO, NETHER LANDS, PERU, POLAND, SINGAPORE, SLOVAKIA, SPAIN, SWITZER LAND, THAILAND, USA, VENEZUELA, VIETNAM KOBOLD Messring GmbH Nordring -4 D-6579 Hofheim/Ts. +49(0)69 99-0 Fax +49(0)69 3398 E-Mail: info.de@kobold.com Internet: www.kobold.com Model: NWS 5
N Description The KOBOLD liquid level switch NWS is designed as a and 3-wire switch and can be universally used in vessels and pipelines. The NWS operates on the tuning fork principle in air at resonance frequency. A piezoelectric crystal is used for excitation of oscillations and for monitoring the actual oscillation frequency. When the fork is immersed in liquid, the frequency changes: this change is detected electronically and the output signal is changed. The NWS operates as a two-wire switch in series with the load. The simple electronic switch is operated by the liquid. The NWS can also be connected to a PLC through a third terminal. Special features The NWS has an output state indicator with an LED that can be seen though a lens in the cover. The LED flashes about once a second when the NWS has switched off and is permanently illuminated when the NWS is switched on. The LED is an optical confirmation that the NWS is working correctly and the condition of the wet side is correctly displayed. The NWS can be set as upper or lower limiter with a mode selector. Applications Oils Water Paints and transparent inks Sauces Milk Liquids containing carbon dioxide Foamed oils Technical Details Material Fork: stainless steel.4404 Process connection: stainless steel.4404 Electronic housing: NWS-...00: PAG, glass-fibre-reinforced cover with window, 330 rotatable all other types: stainless steel.430 Process connections: pipe thread DIN EN 06-, NPT thread, Tri-Clamp, pipe connection DIN 85 (sanitary connection), aseptic-connection DIN 864, DRD flange, flange B 5 PN 40 DN 57, flange B 50 PN 40 DN 57, flange ANSI B 6.5 - ", 300 lbs, flange ANSI B 6.5 - ", 300 lbs Protection: plastic housing: IP 65 (NWS-...00) stainless steel housing, plug connection: IP 67 stainless steel housing, cable connection: IP 68 Max. operating pressure: Max. medium temp.: Min. medium density: Ambient temperature: Min. immersion depth for switch points: Power supply NWS-...00..: 45 bar flange connection: see pressure steps 30 C (NWS-..00..) 90 C (for all other NWS) short-time 50 C for CIP (valid for all models NWS) 800 g/l (lower on request) -0 C...+70 C mm (marker on fork) 4...40 V DC / AC (50/60 Hz); -wire; 4 V DC, 3-wire NWS-...3/4/W/H..: 4 V DC, 3-wire The NWS is ideal for hygienic and sterile applications and for NWS-...E..(ATEX): Isolation Switching Amplifier to CIP cycles up to 50 C. IEC 60947-5-6 (Namur) necessary (for example: REL-6) ATEX version: Delay: s wet /dry s dry / wet Type of protection: intrinsically safe ia Designation: II G EEx ia II C T6 Viscosity: 5000 mm /s max. at 5 C (influence on the response time) To use in connection with intrinsically safe Isolation Switching Amplifier according to Hysteresis: 4 mm vertical, mm horizontal IEC 60947-5-6 Repeatability: ± mm Weight: 0.5 kg (for R 3 4 and 3 4 NPT) 5 www.kobold.com /07-00
Electrical connection NWS-...00... -wire 4-40 V AC/DC, serial Load, I max 500 ma NWS-...00... 3-wire, V S = 4 V DC Output PNP: U HIGH 6.5 V; U LOW.5 V; I max 500 ma 500 ma PE PE 500 ma N Last L V+ 4 N 3 V- 4 Load NWS-...3/4 (4 V DC ) NWS-...W/H (WHG in preparation) NWS-...E... (ATEX) GND (n.c.) + Vs (n.o.) + Vs E + S (n.o.) + Vs (n.c.) GND (n.o.) Switch out GND Switch out -S + S (n.c.) Wiring diagram Colour of core NWS-...3/4 NWS-...W/H Lead-/ Pinnumber NWS-...E (ATEX) brown blue black + Vs (n.o.) / GND + Vs GND / + Vs (n.c.) GND Swich out Swich out 3 4 + S (n.o.) Earth S + S (n.c.) Wiring examples NWS-...E... with Power supply unit acc. to IEC 60947-5-6 Plug Mx E + S (n.o.) + Isolation Switching Amplifier IEC 60947-5-6 (for example: REL-60xx) S + S (n.c.) Cable.5 m Lead No. (Lead No. 4) + Isolation Switching Amplifier IEC 60947-5-6 (for example: REL-60xx) Lead No. Lead No. 3 03-00 www.kobold.com 53
Order Details (Example: NWS-R0 00 0070) Connection Model Electrical connection Sensor version N R 3 4 male thread NWS-R0... R male thread NWS-R5...* 3 4 NPT male thread NWS-N0... Plastic housing 00 = 4...40 V AC/DC Cable gland/ terminal connection 0060 =60 mm (only for NWS-T / NWS-L / NWS-H) NPT male thread NWS-N5...* DIN flange DN 5 NWS-F5... DIN flange DN 50 NWS-F50...* " ANSI flange NWS-A5... " ANSI flange NWS-A50...* Tri-Clamp DN 40 NWS-T40... Tri-Clamp DN 50 NWS-T50... Sanitary conn. DN 40 (DIN 85) NWS-L40... Sanitary conn. DN 50 (DIN 85) NWS-L50... Aseptic conn. DN 50 (DIN 864) NWS-H50... DRD Ø 5 mm flange NWS-DZ... St. steel housing/plug connection 3S = 4 V DC, PNP, plug Mx 4S = 4 V DC, NPN, plug Mx WS***= 4 V DC, WHG, PNP, plug Mx HS***= 4 V DC, WHG, NPN, plug Mx ES= ATEX approval, plug Mx St. steel housing/cable connection 3F = 4 V DC, PNP,.5 m cable 4F = 4 V DC, NPN,.5 m cable WF***= 4 V DC, WHG, PNP,.5 m cable HF*** = 4 V DC, WHG, NPN,.5 m cable EF = ATEX approval,.5 m cable 0070 = 70 mm standard version, short (not for NWS-T / NWS-L) 07** = 7 mm extended 0300**= 300 mm sensor 0500**= 500 mm sensor 000**= 000 mm sensor XXXX**= please specify special length 4-position in mm (max. 3000 mm) Special connection NWS-YYY... **only models marked with * are available with sensors in extended version. ***WHG-approval in preparation. Dimensions NWS-...00 4...V AC/DC Plastic housing NWS-...3S/4S NWS-...WS/HS 4 V DC Plug connection NWS-...3F/4F NWS-...WF/HF 4 V DC Cable connection NWS-...ES ATEX Plug connection NWS-...EF ATEX, Cable connection 09 ø 80 ca. 84 3,5 ø 70 65 70 54 www.kobold.com 03-00
Dimensions (continued) NWS-...0070 (Standard, short) 0 3 NWS-R5...07 NWS-N5...07 (extended) 60 88 60 60 88 7 70 3 N 0 NWS-T... Tri-Clamp 0 NWS-F... / NWS-A... Flange version approx. 36 7 9 L 4 AF L3 L L 3 DN 5 / PN 40 DN 50 / PN 40 ANSI " 300 lbs ANSI " 300 lbs 8 approx. 47 0 7.5 approx. 95 approx. 4.4 approx. 9 NWS-L... Sanitary connection (DIN 85) 0 NWS-H... Aseptic connection (DIN 864) 03-00 www.kobold.com 55
For Temperature Measurement and Temperature Monitoring... N... please refer to our brochure»t+t«kobold Manufacturer for Innovative Instrumentation 56 www.kobold.com 03-00