NWS Liquid Level Switch

Brand: KOBOLD Instruments, Inc.

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.

Specifications

Ambient Temperature Range

  • -20° to 70° C (-4° to 158° F)

Applications

  • Liquids Containing Carbon Dioxide
  • Milk
  • Oil & Foamed Oils
  • Paints & Transparent Inks
  • Sauces
  • Water

Approvals & Certifications

  • ATEX
  • CE
  • Ex
  • IEC 60947-5-6
  • IEC Ex
  • NAMUR

BSP Connection

  • 1" BSPT Male
  • 3/4" BSPT Male

Cable Length

  • 5 feet (1.5 metres)

Connectors

  • Pipe Screw Joints

Current

  • < 3.5 mA - Leakage Current in Off State

Delay Time

  • 1 second

Electrical Connectors

  • Cable Connection
  • Cable Gland
  • Plug Connector M12×1
  • Terminal Connection

Enclosure / Body Material

  • Glass Reinforced Polyamide (PAG)
  • Plastic
  • Stainless Steel

Environmental Protection

  • IP65
  • IP67
  • IP68

Flange Size - 1" (DN 25)

  • 1" (DN 25) - ANSI Class 300
  • 1" (DN 25) - PN 40

Flange Size - 2" (DN 50)

  • 2" (DN 50) - ANSI Class 300
  • 2" (DN 50) - PN 40

Hysteresis

  • 0.039" (1 mm) Horizontal
  • 0.157" (4 mm) Vertical

Input

  • ≤ 400 mA - Maximum

Length

  • Minimum 0.472" (12 mm) - Immersion Depth for Switch Points

Materials of Construction

  • 316 Stainless Steel

Maximum System Pressure

  • psi: 652.7 (kPa: 4,500, bar: 45)

NPT Connection

  • 1" NPT Male
  • 3/4" NPT Male

Output

  • -16.5 V, High - Output PNP
  • 2.5 V, Low - Output PNP

Power Requirement

  • 24-240 Vac/dc, 50/60 Hz

Process Connection Material

  • 316 Stainless Steel

Process Temperature

  • -20° to 130° C (-4° to 266° F)

Repeatability

  • ± 0.039" (± 1 mm)

Rotation

  • 330°

Sensor / Probe Connection

  • 2-Wire
  • 3-Wire

Supply Voltage

  • 24 Vdc

Switch Type

  • PNP & NPN

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