KOBOLD Instruments Inc • 1801 Parkway View Drive • 15205 Pittsburgh, PA • Tel: +1 412 788 2830 • E-mail: Please activate JavaScript • visit koboldusa.com

nws-fuellstand.png: Tuning Fork Level Switch NWS

Tuning Fork Level Switch NWS

For liquids

Contact: 1 electronic switch
G ¾, G1 male thread, ¾" NPT, 1" NPT male thread,
Tri-Clamp® DIN 32676, hygenic DIN 11851,
DIN-flange DN25, DN50, ANSI-flange 1", 2"
Material: stainless steel 1.4404
pmax: 45 bar
tmax: 130°C (150°C CIP-cleaning)
Viscosity: up to 5000 mm²/s
Certificates: ATEX (NWS-...2EF/NWS-...2ES)



NWS-...2EF - Cable Connection

NWS-...2EF - Cable Connection

NWS-...2ES - Plug Connection

NWS-...2ES - Plug Connection


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698 KB

Operating Instructions

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NWS - Operating Instructions

925 KB


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BVS 03 ATEX E 119

II 1G Ex ia IIC T6 Ga

10,7 MB
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IECEx BVS 13.004

Ex ia IIC T6 Ga

4,2 MB


The KOBOLD liquid level switch NWS is designed as a 2 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 2-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.

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KOBOLD Instruments Inc.

1801 Parkway View Drive
15205 Pittsburgh PA
United States of America

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