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The HEINRICHS BGN metal tube variable area flow meter is a precision instrument for measuring the flow rate of liquids and gases in industrial processes. At Rossonix Co., Limited, we supply this robust flow meter to customers worldwide, combining durable construction with straightforward installation and low maintenance requirements. The BGN series is designed for demanding environments, offering reliable performance and easy readability. As an experienced trading company established in 2011, we stand behind every unit we deliver, ensuring that your process measurement needs are met with efficiency and accuracy.
Key Features
Industrial metal tube design: The flow meter features a sturdy metal tube that can handle high pressures and temperatures, making it suitable for harsh industrial conditions.
Variable area measurement principle: The conical tube and float arrangement provide a clear, direct visual indication of flow rate without requiring external power for indication.
Wide measuring range: The BGN model supports a broad range of flow rates, from very low to high capacities, covering various pipe sizes and process demands.
Simple installation: Flanged or threaded connections allow easy integration into existing piping systems, saving time and installation cost.
Low pressure drop: The optimized internal design minimizes energy losses, maintaining stable process conditions.
Various material options: Contact parts are available in stainless steel, Hastelloy, or other corrosion-resistant alloys, depending on the medium and application.
Optional signal output: For remote monitoring and control, the meter can be equipped with a transmitter module such as 4-20 mA or pulse output on request.
Technical Specifications
| Flow range (water) | From 0.1 m³/h to 30 m³/h (depending on size) |
| Flow range (air) | From 1 m³/h to 300 m³/h (depending on size) |
| Accuracy | ±1.5% F.S. (standard), ±1.0% F.S. (optional) |
| Max working pressure | Up to 25 MPa (higher on request) |
| Medium temperature | -40°C to +200°C (higher with special seals) |
| Connection size | DN15, DN25, DN40, DN50, DN80, DN100 or equivalent |
| Connection type | Flange (GB, ANSI, DIN) or threaded (optional) |
| Float material | Stainless steel 304 / 316L, Hastelloy C, PTFE (optional) |
| Enclosure protection | IP65 standard; IP67 optional for outdoor use |
| Mounting | Vertical or horizontal (with proper installation) |
Areas of Application
Chemical and petrochemical industry: measuring raw materials, intermediates and finished liquids.
Power generation: monitoring cooling water, fuel or auxiliary process flows.
Water treatment: flow control of dosing media, clean water or waste water in treatment plants.
Pharmaceutical and food processing: hygienic flow measurement with optional sanitary connections and materials.
Oil and gas: flow indication for lines where an economical and reliable solution is needed.
Machinery and equipment: integration into compressors, pumps or hydraulic systems as a flow-monitoring component.
The BGN series brings clear operational advantages. Its all-metal construction offers high mechanical strength and corrosion resistance, which reduces the frequency of replacement and maintenance. The direct scale reading eliminates the need for power supply for the basic measuring instrument, making it useful in remote locations where electrical power is not readily available. In addition, the flow meter is low in pressure loss, which helps optimize pump performance and reduce energy consumption. Thanks to its modular design, the BGN can be combined with different flange sizes, float materials and optional transmitters to match specific process requirements.
Available Options
To suit diverse installation and monitoring conditions, the HEINRICHS BGN flow meter can be customized. Options include a 4-20 mA analog output for remote monitoring, a switching contact for alarm or limit signals, a pulse output for totalization, and a special scale in any desired unit. For high-temperature or corrosive media, alternative sealing materials and float coatings are available upon request. The flow meter can also be manufactured with flange ratings according to ANSI, DIN, or JIS standards, ensuring compatibility with most industrial piping systems.
Rossonix Co., Limited has been active in international industrial supply since 2011, with annual export value between US$5 million and US$10 million and overseas offices that support customers across North America, South America, Europe, Oceania, the Middle East, Asia and domestic China. Our team of 11–50 experienced staff members coordinates logistics from Shenzhen, Hong Kong and European ports to deliver on schedule. Each HEINRICHS BGN flow meter is sourced through verified channels and quality-assured according to ISO9001 and ISO9000 procedures. Contact us to discuss your required measuring range, connector type and material choices. We are ready to provide a suitable flow measurement solution for your next project.
Frequently Asked Questions
Q1: What is the operating principle of the BGN metal tube variable area flow meter?
A: The meter uses a conical tube and a float that rises or falls proportionally to the flow rate. The position of the float indicates the flow reading on a scale. Because the float moves vertically, the area between the float and tube changes, creating a direct relationship between flow rate and float position.
Q2: Can the BGN flow meter be used for both liquid and gas measurement?
A: Yes, the BGN series is suitable for measuring the flow of clean liquids and gases. The scale and float are calibrated according to the specific medium and operating conditions, so the accurate range must be defined when ordering.
Q3: What output signals are available for remote monitoring?
A: A 4-20 mA analog transmitter is the most common option. A pulse output for total flow counting and limit switch contacts for low or high flow alarms are also available. These options can be arranged at the factory before shipment.
Q4: How should the flow meter be installed?
A: The BGN is normally installed vertically with the flow entering from below and leaving from the top. A straight pipe section before and after the meter is recommended to ensure a stable flow profile. Horizontal installation is possible for special versions, but the measuring accuracy may be affected if sufficient upstream length is not provided.
Q5: Does the flow meter require external power?
A: The basic indicator model does not need external power. The readout is based entirely on the position of the float inside the meter. If an optional electronic transmitter is fitted, a power supply for the transmitter is required.
Q6: Can I customize the material and flange type?
A: Yes. The wetted parts can be manufactured from stainless steel 304, 316L, Hastelloy C or PTFE lined materials to handle different corrosive media. Flange standards such as GB, ANSI, DIN and JIS can be supplied, and special flange pressure ratings can be considered on request.
Q7: What is the accuracy of the BGN series?
A: The standard accuracy is ±1.5% of full scale. For applications that need more precise measurement, a calibration to ±1.0% of full scale can be selected at the time of production.
Q8: What maintenance is required?
A: This flow meter is designed for low maintenance. Periodically inspect the float and tube for deposits or wear, and clean it if necessary. Mechanical parts rarely need replacement, and no routine lubrication is required.
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