Durchfluss

All-Metal Variable Area Flow Meter

Type: BGN

The BGN Variable Area Flow Meter is a durable, all-metal device intended for accurate and dependable measurement of liquids, gases, and steam in many industrial applications. The BGN flow meter, based on the principle of variable area flow measurement. The device delivers precise measurements, even in the most demanding conditions. It is a long-lasting asset for sectors where measurement accuracy is critical due to its robust design and premium materials.

→ Downloads

Operational mode and system design

Measuring Ring Float Magnet Tracking System Scale Magnet Flow

The BGN flow meter operates based on a simple yet effective measuring principle. The medium flows upward through a sharp-edged measuring ring, lifting the conical float. As the float rises, it creates a gap between itself and the ring that is proportional to the flow rate. The balance between buoyancy force and the float’s weight determine the float’s position, which a magnet tracking system transmits to the scale for precise flow measurement.

  • Use a conical float inside a tube for flow rates between 5 and 50 l/h; use a cylindrical float for lower ranges up to 40 l/h.
  • A permanent magnet in the float transmits its position to the analog indicator or optional electronic evaluators.
  • The meter’s design includes flange and thread connections for simple installation.
  • The scale displays the rotary motion of the float for an accurate reading.
  • This design makes the BGN flow meter a reliable solution for a wide range of applications.

Key Features of the BGN Variable Area Flow Meter

Feature

Description
Durable All-Metal ConstructionThis flow meter is constructed entirely from high-grade metals, ensuring exceptional performance and reliability for challenging industrial applications. Its endurance allows it to survive extreme temperatures and pressures, making it an ideal choice for such environmental demands.
High-Precision MeasurementWith its improved float design and visible 90° scale, the BGN flow meter provides precise, reproducible flow measurements. For mass and volume flow rates an accuracy of ±1.6% to ±2.2% at 50% of the flow rate (qg) is achieved. This high-precision attribute is critical for applications where minor variations can greatly affect production quality and safety.
Versatile Application RangeHighly versatile, this flow meter can measure liquids, gases, and steam in a variety of industries, including petrochemical, oil and gas, and chemical. This adaptability guarantees its capacity to fulfill various industrial requirements, rendering it an effective choice for numerous applications.
Resilience to Temperature and PressureThe BGN flow meter has been designed to perform effectively in challenging environments. The design allows an operation at temperatures reaching 350 °C and pressures up to 600 bars. This robustness renders it appropriate for severe settings where reliability is essential for operational safety and performance.
Electrical Integration for Enhanced Process ControlThe BGN flow meter is compatible with multiple electrical output signals, including HART, Profibus, and Foundation Fieldbus, to improve process control. This connectivity facilitates real-time data acquisition, enabling operators to oversee and modify processes with enhanced accuracy.
Optional Damping and Heating JacketThe BGN provides optional gas or liquid damping to improve performance. By stabilizing the float during the start-up process of the system, it guarantees precise readings. An optional heating jacket is provided, enabling the meter to sustain fluid temperatures, which is advantageous for temperature-sensitive processes.

Benefits of the BGN Variable Area Flow Meter

  • Long-Term Durability: The BGN flow meter improves operational efficiency by extending service intervals and reducing maintenance costs due to its robust all-metal construction.
  • Operational Versatility: The BGN is an extremely versatile instrument for a wide range of industrial applications. Due to its capacity to measure different fluids (liquids, gases, and steam), it is suitable for industrial sectors such as chemical, petrochemical, and oil and gas.
  • Enhanced Process Control: The BGN’s compatibility with modern electrical integration systems like HART, Profibus, and Foundation Fieldbus makes real-time data collection and process optimization possible, which increases accuracy and productivity.
  • Customizable for Specific Needs: With optional features like a heating jacket and gas/liquid damping, the BGN can be customized to meet particular operational needs.
  • Minimal Downtime and Maintenance: The self-draining design simplifies maintenance and prevents fluid collection, reducing downtime and keeping the meter running smoothly with little intervention.
  • Reliable Performance: With its ability to withstand high-pressure environments, the BGN flow meter ensures reliable, accurate performance even in challenging industrial conditions.

Installation and Operational Details

The BGN Variable Area Flow Meter is ideal for vertical pipeline installations with bottom-to-top flow. Regular inspections are essential to ensure smooth float movement and prevent blockages.

To facilitate maintenance, the optional self-draining feature effectively clears residual fluids, extending the service life of the meter. In high-temperature applications up to 350°C, an optional heating jacket helps maintain the fluid at the required temperature for precise measurement. The all-metal construction ensures durability and reliability in high-pressure environments up to 600 bars.

Details

Applications
Flow measurement of liquid or gaseous products and steam in pipes. Indication of momentary volume- or mass flow per time unit. The areas of application include a variety of:

Chemical and petrochemical industry: Using an all-metal construction is advantageous in environments where corrosion is a concern. Chemical processes in the industry may involve corrosive substances that could degrade non-metallic materials. In the petrochemical industry, processes often involve high temperatures. Metal flow meters can withstand elevated temperatures better than some non-metallic alternatives. Petrochemicals may include corrosive substances, and the use of an all-metal flow meter ensures corrosion resistance, maintaining the integrity of the meter over time. Variable area flow meters provide visual flow rate indications and can offer high accuracy and precision in measuring fluid flows.

The oil and gas industry: These sectors are involving harsh environments with varying temperatures, pressures, and often corrosive substances. An all-metal construction enhances the durability and resilience of the flow meter, allowing it to withstand these challenging conditions. Oil and gas processes may involve corrosive substances. The corrosion-resistant properties of metal flow meters make them suitable for use in environments where corrosion is a concern.

Special features
The BGN flow meter is equipped with several features
  • The BGN flow meter is equipped with several features
  • Clear 90° Scale: Enables precise and easy reading of the flow rate.
  • Extreme Temperature Capability: Operates effectively at temperatures up to 350 °C, ideal for high-temperature processes.
  • High-Pressure Resistance: It withstands pressures up to 600 bar, making it suitable for high-pressure applications.
  • Versatile Wetted Materials: Available in stainless steel, Hastelloy and with PTFE coating to ensure compatibility with different fluids and industrial processes.
  • Gas or liquid damping (optional): stabilizes the float during the start-up process of the system for accurate readings.
  • Heating Jacket (optional): Maintains fluid temperature for consistent measurement in temperature-sensitive applications.
  • Self-Draining Design (optional): Facilitates easy maintenance and prevents the accumulation of residual fluids.
Technical data

Body:

  • Materials:
    • 1.4404 (316 L) / 1.4571 (316 Ti)
    • Hastelloy C-22,
    • PTFE
    • others on request
  • Process connection:
    • Flanges acc. EN 1092, ASME B16.5, DIN2512, JIS
    • Thread: G, NPT
    • Special connections
  • Nominal pressure:
    • PN 40
    • ASME Cl150 / 300 (Standard)
    • Optional: pressures up to 600 bar
  • Process temperature: -40°C … +350°C
  • Ambient temperature: -40°C … +80°C
  • Ingress protection: IP 65 / IP 47 (EN60529)
  • CE-Marking: Pressure Equipment Directive 97/23/EG

Measuring range:

from 0,5…5 l/h up to 13.000…130.000 l/h water

Display:

  • Aluminum (enamel finish)
  • Stainless steel

Output signal:

  • Up to 2x inductive switch (also with safety function)
  • Up to 2x switch contact.
  • ES Transmitter
    • 4…20mA
    • 4…20mA, 2xNAMUR – switches
    • 4…20mA, 1x NAMUR – switch, 1x pulse output
    • HART
    • Profibus PA
    • Foundation Fieldbus
    • counter module
  • Ambient temperature:
    • -40°C… +80°C (without switches)
    • -40°C…+70°C (with switches)

Accuracy

  • Liquid: ± 1,6% of upper range value (BGN-S/H), ± 0,2% with transmitter (ES)
  • Gas: ± 1,8% of upper range value (BGN-S/H), ± 0,2% with transmitter (ES)

Certificate and approval

  • CE-Marking:
    • 2014/30/EU (EMC)
    • 2014/34/EU (ATEX)
    • 2014/35/EU (LVD)
    • 2014/68/EU (PED)
  • Explosion protection: DMT 00 ATEX E 075
  • Type of protection:
    II 2G Ex h IIC T1…T6 Gb                (mechanical)
    II 2G Ex ia IIC T6                              (ES Transmitter)

Device sizing

Device sizing