Kobold BGN Variable Area Flow Meter

General

Kobold BGN Variable Area Flow Meter from bottom to top through the meter tube of the flowmeter. The float is lifted until an annular gap between the meter ring and the cone-shaped float is produced which corresponds to the flow. The forces acting on the float are in equilibrium.

The forces that are mainly acting on the float comprise buoyancy according to the principle of Archimedes, the flow force of the medium and the weight force. Each position of the float corresponds to a flow value measured during calibration, which is transferred to a scale. The BGN variable area flowmeter consists of a meter tube with connections, a meter ring, and a conical float.

By means of a magnet, the position of the float is transferred to an encapsulated follow magnet, which has been fitted to a pointer axle. The position of a second annular follow magnet fitted on the pointer axle is transferred to the scale by means of the pointer.

Description

Kobold BGN Variable Area Flow Meter Applications

The KOBOLD-BGN meter is suitable for flow measurement of liquid or gaseous products in pipes. It shows the current flow rate in volume or mass per unit in time.

Applications:

• Fflow measurement,
• Dosing,
• Monitoring,
• Adjusting and control of liquid and gaseous products.
• The meter’s design makes it ideal for processes under difficult and adverse operating conditions.

Flow measurement, monitoring, adjusting and control of liquid and gaseous products. The meter’s design makes it ideal for processes under difficult and rough operating conditions. The devices are available with additional electrical equipment for process monitoring and control.

Features

• A large spectrum of wetted materials
• Magneto-resistive signal transmission
• Gas- or liquid damping (option)
• Special design for high-pressure and high-temperature applications
• Excellent heat tracing technology (option)
• Double eddy current damping (special version)
• Self draining (special version)
• Backflow stop (special version)
• Flow Controller (special version)

Measuring principle

• The measuring element consists of a sharp-edged measuring ring  and a conical float
•  A medium flows from the bottom to the top through the measuring ring, lifting the float until the buoyancy force and the weight of the float  establish equilibrium.
• As the height of the float varies, an annular clearance proportional to the flow appears between the float and the measuring ring.
• The height of the float in the measuring ring is a measure of the flow.
• The permanent magnet embedded in the float then transmits this measure to the scale and the optional electronic evaluators through a magnet tracking indicator system

System design

The meter consists of a cylindrical fitting pipe with flange connections on both sides. For the measuring range from 5 to 50 l/h, a measuring ring is inserted in the tube in which a conical float can move with vertical freedom.  For small measuring ranges of up to 4–40 l/h, the measuring cell consists of a conical measuring tube with cylindrical float.

The height of the float resulting from the flow rate is transmitted in a rotary motion by a built-in permanent magnet through a magnet tracking indicator system in a rotation to the pointer axis of the analog indicator unit.

Kobold BGN Variable Area Flow Meter Technical Details

Designed for applications that require high pressure capability, high temperature operation, low pressure loss.

Specification

• Measuring ranges:
  • Water; (0.0022 to 0.022) up to (57.24 to 572.2) GPM
  • Air; (0.008 to 0.08) up to (64.74 to 647.4) SCFM
• Accuracy liquid:
  • ±1.6% of Full Scale (BGN-S/H)
  • ±2.0% of Full Scale (BGN-P)
• Accuracy gas:
  • ±1.8% of Full Scale (BGN-S/H)
  • ±2.2% of Full Scale (BGN-P)
• Connection:
  • 1/2″ to 6″ ANSI
  • 1/4″ to 2″ NPT
• Materials: SST, Hastelloy C-22, PTFE
• A large spectrum of wetted materials
• Magneto-resistive signal transmission
• Gas- or liquid damping (option)
• Excellent heat tracing technology (option)

Fitting

• Wetted parts: st. st. 1.4404 (316 L) / 1.4571 (316 Ti), Hastelloy® C-22/C4, PTFE
  other materials on request
• Process connection: Flanges acc. EN 1092-1 ASME B16.5, DIN 2512, JIS, NPT, screw pipe
  connection, special connections on request
• Nominal pressure: PN 40, ASME Cl150 / 300 (standard) (BGN-S/H) PN 16, ASME Cl150 (standard) (BGN-P) higher pressure rates optional (max. 600 bar)
• Process temperature:
  -40°C…+200°C
  (BGN-S/H without electr. output)
  -40°C…+150°C
  (BGN-S/H with electr. output)
  -40°C…+350°C
  (BGN-S/H with option V/ H / W)
  -40°C…+125°C (BGN-P
• Ambient temperature: -40°C …+80°C

Accuracy

• Liquid:
  ±1.6% of full scale (BGN-S/H)
  ±2.0% of full scale (BGN-P)
• Gas:
  ±1.8% of full scale (BGN-S/H)
  ±2.2% of full scale (BGN-P)
• Additional inaccuracy through transmitter (ES): ±0.2%
• Repeatability: ±0.5% of full scale
• Protection:
  IP 65 (aluminium housing)
  IP 67 (stainless steel housing)

Certification

• Explosion protection: BVS 03 ATEX H/B 112
• CE-Marking: Pressure Equipment Directive 97/23/Eg

Download Datasheet: Kobold BGN Variable Areaowmeter

Reference : kobold.com

Another Article:

• Heinrichs BGN Variable Area Flow Meter
• Apollo Valves 10-100 or 300 Series Safety Relief Valves
• UTS Kobold Variable Area Flowmeter
• Kobold Variable Area Flowmeter / Switch V31
• Kobold Variable Area Flowmeter – Class Cone