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NBK-31 Bypass Level Indicator
Brand: KOBOLD Instruments, Inc
Kobold bypass level indicators are used for continuous measurement, display and monitoring of liquid levels. The bypass tube is attached onto the side wall of the vessel. According to the law of communicating tubes the level in the bypass tube equals the level in the vessel.
A float with embedded circular magnets in the bypass tube follows the liquid level and transfers it in a non-contacting manner to a display fitted outside the tube or to a monitoring device.
Features- Measuring Length: Single-Part Maximum 5,500 mm, over 5,500 mm Two-Part or Multipart
- Pressure: Maximum PN 320
- Temperature: -40° to 400° C
- Viscosity: Maximum 200 mm²/s Standard (Option: 460 mm²/s, only NBK-03)
- Connection: DIN Flange DN15 to DN50, ANSI Flange 1/2" to 2", R and NPT Threads, Welding Nipple DN15 to DN32
- Material: Stainless Steel 1.4571
- Insensitive Magnet Roller or Ball Display Without Auxiliary Energy
- Limit Contacts
- Analog Output, HART®, Profibus® PA, Foundation Fieldbus
Specifications
Brand
Accuracy
- ± 0.039” (± 1 mm)
Ambient Temperature Range
- -40° to 350° C (-40° to 662° F)
Applications
- Agitator Vessel
- Storage Tanks
- Tanks on Ships
- Water Tanks
Approvals & Certifications
- ATEX
- CE
- GL
Ball Material
- Ultramid & Ultramid B
Bandwidth
- 60 dB - Min. Signal/Noise Ratio
BSP Connection
- 1” BSPT
- 1/2” BSPT
- 1-1/4” BSPT
- 3/4” BSPT
Cable Entry
- M16 x 1.5
Cable Length
- 10 feet (3 metres)
Cable Material
- Brass Nickel-Plated
- PVC
Communication
- FOUNDATION Fieldbus
- HART
- Loop Link 5905A
- PROFIBUS PA
Consumption
- < 11 mA
Current
- 0.5 A, Max.
Dimensions
- Ø 1.73” x 0.80” (Ø 44 x 20.2 mm)
Display
- LED, LCD Display
Electrical Connectors
- Cable Gland M20 x 1.5 (PVC)
Electrical Contacts
- Bistable
- Normally Open
Electrical Rating
- 230 Vac/Vdc at 1 A, 60 W/VA - Max.
- 250 Vac/Vdc at 1 A, 80 VA - Max.
Enclosure / Body Material
- Aluminum Pressure-Cast
- Polycarbonate
Environmental Protection
- IP54
- IP65
- IP66
- IP67
Flange Material
- 316Ti Stainless Steel
Flange Size - 1” (DN 25)
- 1” (DN 25) - 900#
- 1” (DN 25) - PN 160
Flange Size - 1/2” (DN 15)
- 1/2” (DN 15) - 900#
- 1/2” (DN 15) - PN 160
Flange Size - 3/4” (DN 20)
- 3/4” (DN 20) - 900# ASME
- 3/4” (DN 20) - PN 160
Flange Type
- RTJ - Ring Typical Joint
Function
- 2 Analog
Gasket Material
- Klinger SIL
- PTFE
Hysteresis
- 0.28” (7 mm)
Isolation
- 1.5 kVac / 50 Vac
Length
- Maximum
Load Impedance
- (Vsupply-9 V)/0.02 ohms
- ≤ (Vsupply-8 V) / 0.023 ohms
Materials of Construction
- 304L Stainless Steel - Carrier Frame
- 316Ti Stainless Steel - Valve
- Aluminum Brown Anodised - Carrier Frame Material, Ball Support Rail
- Borosilicate Glass - Display Glass, Sight Tube
- Ceramic - Roller
- Makrolon - Sight Tube
- Plexiglass - Display Glass, Sight Tube
- Polypropylene - Roller
Maximum System Pressure
- psi: 4,641 (kPa: 32,000, bar: 320)
NPT Connection
- 1” NPT Female
- 1/2” NPT Female
- 1-1/4” NPT Female
- 3/4” NPT Female
Operating Temperature
- -105° to 100° C (-157° to 212° F)
Output
- 4-20 mA
Output Format
- Analog Output
Output Load
- 500 ohms, Max.
Power Requirement
- 5 W
- 8-35 Vdc
Process Temperature
- -40° to 400° C (-40° to 204° F) - Ceramic Rollers
Programming
- Loop Link
Resistance
- 0 to 10,000 ohms - Input Linear Resistance
- 0.7 to 7 kiloohms - Total Resistance
- 20 milliohms to 11,000 ohms
Resolution
- 0.39” (10 mm)
Response Time
- 1 second
Scale Panel Material
- 304L Stainless Steel
- Hard PVC
Seat / Seal Material
- 304L Stainless Steel
- Aluminum
- FPM
- Per Buna-N
Sensor / Probe Connection
- 2-Wire
Sensor / Probe Type
- NAMUR Sensor
- Reed Switch
Supply Voltage
- 2.5-400 V
- Loop Powered
Update Time
- 135 milliseconds