NBK-04 Over-Head Level Indicator

Brand: KOBOLD Instruments, Inc.

Kobold over-head level indicators are used for continuous measurement, display and monitoring of liquid levels.

The float inside the tank is attached by means of a connecting rod to the magnet carrier in the over-head tube. The magnet fitted in the magnet carrier operates, in a non-contacting manner, the display and monitoring devices fitted outside tube.
Features
  • Measuring length: maximum 4000 mm
  • Maximum pressure: PN 16 / Class 150
  • Maximum temperature: 120° C
  • Viscosity: maximum 200 mm²/s
  • Connection: DIN EN 1092-1 flange DN 50 / 65, ASME B 16.5 flange 2", 2-1/2"
  • Material: stainless steel 1.4571
  • Insensitive magnet roller display or ball display without auxiliary energy
  • Limit contacts
  • Analog output, HART®, Profibus-PA®, Foundation Fieldbus®

Specifications

Accuracy

  • ± 0.039" (± 1 mm)

Ambient Temperature Range

  • -40° to 145° C (-40° to 293° F)

Applications

  • Aggressive Media
  • Mixing Vessels
  • Storage Tanks
  • Water Tanks

Approvals & Certifications

  • ATEX

Ball Material

  • Brown Anodised Aluminum - Support Rail
  • Ultramid & Ultramid B

Cable Entry

  • M16 × 1.5
  • M20×1.5

Cable Length

  • 9.84 feet (3 metres)

Cable Material

  • Nickel-Plated Brass
  • PVC

Communication

  • FOUNDATION Fieldbus ITK 4.51
  • HART
  • Loop Link 5905A
  • PROFIBUS PA (EN 50170 Standard)

Consumption

  • < 11 mA

Display

  • LCD & LED

Electrical Connectors

  • Cable Entry
  • Cable Gland

Electrical Contacts

  • Bistable Changeover Contact
  • Normally Closed & Normally Open

Electrical Rating

  • 0.1 A at 24 Vdc
  • 230 Vac/dc, 1 A, 60 W/VA
  • 250 Vac/dc / 1 A / 80 VA
  • 400 Vdc / 250 Vac, 0.5 A, 5 W

Enclosure, Body Material

  • Aluminum Pressure-Cast
  • Polycarbonate

Environmental Protection

  • IP54
  • IP65
  • IP66
  • IP67

Fill Material

  • Silicone Oil

Flange Size - 2" (DN 50)

  • 2" (DN 50) - 150# ASME
  • 2" (DN 50) - PN 16

Flange Size - 2-1/2" (DN 65)

  • 2-1/2" (DN 65) - 150# ASME
  • 2-1/2" (DN 65) - PN 16

Hysteresis

  • 0.27" to 0.59" (7 to 15 mm)

Isolation

  • 1.5 kVac / 50 Vac - Isolation Voltage, Test/Operation

Length

  • 1.96 to 13.12 feet (600 to 4,000 mm) - Measuring Length

Load

  • 500 ohms, Maximum

Materials of Construction

  • 304L Stainless Steel - Carrier Frame
  • 316Ti Stainless Steel - Connecting Rod
  • Borosilicate Glass - Sight Tube
  • Makrolon - Sight Tube
  • Plexiglass - Display, Sight Tube
  • Polypropylene - Roller
  • Titanium - Float, Connecting Rod

Operating Pressure

  • Maximum

Operating Temperature

  • -50° to 120° C (-58° to 248° F)

Operating Voltages

  • 15-400 Vdc
  • 250 Vac

Output

  • 4-20 mA
  • FOUNDATION Fieldbus & PROFIBUS PA

Output Noise

  • Minimum 60 dB - Signal to Noise Ratio

Plug Material

  • 304L Stainless Steel - Sealing Plug
  • Aluminum - Sealing Plug

Power Requirement

  • 8-35 Vdc
  • Loop Powered

Process Temperature

  • -50° to 120° C (-58° to 248° F)

Resistance

  • 0 to 10,000 ohms - Input Linear Resistance
  • 1 kiloohms - On
  • 11 kiloohms - Off

Resolution

  • 0.39" (10 mm)

Response Time

  • 1 second

Scale Panel Material

  • 304L Stainless Steel
  • Hard PVC

Seat / Seal Material

  • Seal: FKM
  • Seal: NBR

Sensor, Probe Type

  • NAMUR Sensor
  • Reed Switch

Supply Voltage

  • 24 Vdc, Maximum
  • 9-32 Vdc

Switch Type

  • Transistor: Normally Open & Normally Closed, Bistable

Temperature Range

  • 80° C (176° F) - Maximum

Update Time

  • 135 milliseconds

Voltage Drop

  • 2.5 V, Maximum
  • 3.3 V at 4 mA - LED
  • 3.7 V at 20 mA - LED

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