Variable Area FlowmetersSince 1921, the name KROHNE has not only stood for innovative and reliable process measuring technology solutions, but also for exact, reliable and long-lasting variable area measuring technology. To get more information please expand the product block by pressing on image or product title. To get detailed information about specific product you can download Technical datasheet file by clicking corresponding link. Choose the flowmeter that best matches your application from the following table. Further details are contained on this page below, and in the data sheets available for download. Legend: Suitable
Application | H250 M40 | VA 40 | VA 45 | DK 32 | DK 34 | DK 37 | DK 46...800 | Chemical industry | Additives like catalysts, tensides, foam inhibitors, emulsifiers | | | | | | | | Acids, bases, chloridic substances, sulphuric substances | | | | | | | | Condensate and cooling water | | | | | | | | Inertisation of vessels and tanks | | | | | | | | Sample flow monitoring for analysis | | | | | | | | Gas sparging in liquids | | | | | | | | Petrochemical industry | Sample flow monitoring for analysis | | | | | | | | Inertisation of vessels and tanks | | | | | | | | Condensate and cooling water | | | | | | | | Oil & Gas | Corrosion and scale inhibitors, caustic soda | | | | | | | | Emulsifiers and demulsifiers | | | | | | | | Sample flow monitoring for analysis | | | | | | | | Machine building | Gas seal monitoring for turbo compressors | | | | | | | | Coolant and lubricant | | | | | | | | Dry-run and overheating protection | | | | | | | | Air supply, cooling water supply | | | | | | | | Furnace construction | Gas/oil consumption X | | | | | | | | Dosing of protective gas | | | | | | | | Cooling water | | | | | | | | Pharmaceutical industry | Demineralised water, alcohol, solvents, cleaning agents | | | | | | | | Food industry | Vegetable oil, drinking water, milk, carbon dioxide, cleaning agent | | | | | | | | Water & Wastewater | Oxygen sparging aeration basin | | | | | | | | Air injection to reduce iron content | | | | | | | | Laboratories and test facilities | Chemicals and Gases | | | | | | | | General | Flow measurement of clean gases and liquids without auxiliary energy | | | | | | | |
Variable Area FlowmetersThe range of applications spans from hygienic and aseptic applications for the food industry, the pharmaceutical industry and medical technology, for which the world's only metal variable area flowmeter with EHEDG certification is used, right down to usage in the chemical and water industry or industrial forges and furnaces. H250 M40 | | | The all-metal variable area flowmeter H250 is used for flow measurement of conductive andnon-conductive liquids, gases and vapours. |
Highlights indicator/transmitter M40 - Simple, low-cost installation: Measure and display without auxiliary power supply
- Unique modularity to adapt to customer-specific applications limit switches (NAMUR, 3-wire transistor or reed contacts)
- 2-wire analog output 4…20mA with HART
- Foundation Fieldbus / Profibus PA interface
- Graphical LC display with flow counter and pulse output
- Universal ex-concept: Flameproof and intrinsically safe
- Ingress protection IP66/68, IP69K, NEMA 4x/6
- Any meter orientation possible: vertical, horizontal or in fall pipes
Highlights H250 measuring cone - Sturdy stainless steel construction for high operating pressure up to 3000 bar and extreme process temperatures from -200°C to +400°C
- Optionally available with PTFE/ceramic liner for acids and alkalis
- High application security, even with extremely small flows
- Excellent long-term stability
- Upper limit of measurement for liquids: 10 to 120,000 l/h (water: 20°C)
- Upper limit of measurement for gases: 0.7 to 2800 m3/h (air: 20°C, 1.013 bar)
- Measuring range 10:1 (optional 100:1)
- Accuracy: 1.6 % according VDI/VDE 3513-2 (qG = 50%)
- Many different process connections
- Flanges as per EN (DN15-DN150), ASME and JIS
- Screw and clamp connections, welding ends et al.
- Special design for the food and pharmaceutical industry with EHEDG approval
Company offers H250 series models: H250 M8, H250 M9, H250 M10. Techical datasheet : H250 M40.pdf
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VA 40 | | | The VA40 flowmeter is suitable for measuring the flow rate of liquids or gases. |
Highlights - Simple, low-cost measuring principle without auxiliary power
- Stainless steel fittings: other materials optional
- Thread, flange, hose or clamp connection
- Process temperatures: -20°C to +100°C
- Operating pressure up to 7/10 bar (depending on DN)
- Upper limit of measurement for liquids: 0.4 to 10,000 l/h (water: 20°C)
- Upper limit of measurement for gases: 7 to 310,000 l/h (air: 20°C, 1.013 bar)
- 2 limit switches
- Accuracy 1.0 % of measured value acc. VDI/VDE 3513-2 (qG=50%)
- Use in hazardous areas (ATEX)
- Special food and pharmaceutical variant
Food and pharmaceutical design Smooth stainless steel surfaces featuring a surface roughness of the components in contact with the medium of <0.8 µm make it difficult for deposits to form and are easy to clean.There are suitable connections and FDA conforming materials for the food and pharmaceutical industry. Techical datasheet : VA40,45.pdf
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VA 45 | | | The VA45 flowmeter is suitable for measuring gases at low operating pressures. |
Flowmeters especially for gases The VA 45 variable area flowmeters were designed to measure gases. They can be used, for example, in industrial ovens, forges and furnaces, and protective gas and heating systems. The standardized device design is available with various connections that conform to standards. The glass measuring cone, protected by a metal sleeve with a viewing glass, makes it easy to read the flow directly. Highlights - Simple, low-cost measuring principle without auxiliary power
- Stainless steel fittings: other materials optional
- Thread, flange or hose connection
- Process temperatures: -20°C to +100°C
- For measuring gases at low operating pressure up to 1 bar
- Upper limit of measurement for gases: 1.5 to 75 m3/h (air: 20°C, 1.013 bar)
- Accuracy 2.5 % of measured value acc. VDI/VDE 3513-2 (qG=50%)
- Suitable for measuring gases in accordance with DVGW process sheet G 260
- Connector variants
Techical datasheet : VA40,45.pdf
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DK 32 | | | Solid metal DK flowmeters are suitable for measuring the flow rate of liquids, gases and vapors. Because of their robust design the flowmeters are particularly suited for difficult operating and environmental conditions. DK32 is designed with horizontal connections, with valve. |
Small flowmeters (metal) The DK 32 variable area flowmeters are versatile and can be used for gases and liquids. Highlights - Simple and low-cost measuring principle without auxiliary power
- Materials in contact with the medium: Stainless steel, optional: Hastelloy, Monel, titanium
- Process temperatures from -80°C to +150°C
- Operating pressure up to 130 bar
- Upper limit of measurement for liquids: 1.6 to 160 l/h (water: 20°C)
- Upper limit of measurement for gases: 16 to 4,800 l/h (air: 20°C, 1.013 bar)
- 2 limit switches
- SIL 2 compliant acc. IEC61508
- Accuracy 4.0 % of measured value acc. VDI/VDE 3513-2 (qG=50%)
- Approved for hazardous areas in accordance with ATEX, FM, NEPSI
- Ingress protection IP66/68 (IP65 with limit switches)
- Many different process connections
Techical datasheet : DK32,34,37.pdf
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DK 34 | | | Solid metal DK flowmeters are suitable for measuring the flow rate of liquids, gases and vapors. Because of their robust design the flowmeters are particularly suited for difficult operating and environmental conditions. DK34 is designed with vertical connections, without valve. |
Small flowmeters (metal) The DK 34 variable area flowmeters are versatile and can be used for gases and liquids. Highlights - Simple and low-cost measuring principle without auxiliary power
- Materials in contact with the medium: Stainless steel, optional: Hastelloy, Monel, titanium
- Process temperatures from -80°C to +150°C
- Operating pressure up to 130 bar
- Upper limit of measurement for liquids: 1.6 to 160 l/h (water: 20°C)
- Upper limit of measurement for gases: 16 to 4,800 l/h (air: 20°C, 1.013 bar)
- 2 limit switches
- SIL 2 compliant acc. IEC61508
- Accuracy 4.0 % of measured value acc. VDI/VDE 3513-2 (qG=50%)
- Approved for hazardous areas in accordance with ATEX, FM, NEPSI
- Ingress protection IP66/68 (IP65 with limit switches)
- Many different process connections
Techical datasheet : DK32,34,37.pdf
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DK 37 | | | Solid metal DK flowmeters are suitable for measuring the flow rate of liquids, gases and vapors. Because of their robust design the flowmeters are particularly suited for difficult operating and environmental conditions. DK37 has an increased measurement accuracy and larger indication. |
Small flowmeters (metal) The DK 37 variable area flowmeters can either be equipped with a mechanical or electronic indicator and are suitable for measuring gases and liquids. Highlights - Materials coming into contact with the medium: Stainless steel, optional: Hastelloy, Monel, titanium
- Process temperatures: -80 to +150°C (-25 to +135°C for el. indicator)
- Operating pressure up to 130 bar
- Upper limit of measurement for liquids: 1.6 to 160 l/h (water: 20°C)
- Upper limit of measurement for gases: 16 to 4,800 l/h (air: 20°C, 1.013 bar)
- 2 limit switches or mA analog output
- SIL 2 compliant acc. IEC61508
- Accuracy 2.5 % of measured value acc. VDI/VDE 3513-2 (qG=50%)
- Approved for hazardous areas in accordance with ATEX, and NEPSI
- Ingress protection IP66
- Many different process connections
Techical datasheet : DK32,34,37.pdf
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DK 46...800 | | | The DK46...DK800 flowmeters are suitable for measuring the volume flow rate of liquids and gases. |
Small flowmeters (glass) The DK 46, DK 47, DK 48 and DK 800 variable area flowmeters feature glass cones of varying lengths for different accuracy requirements. Highlights - Simple, low-cost measuring principle without auxiliary power
- Stainless steel, brass or PVDF fittings
- Needle valve in foot or head piece
- Process temperatures: -5°C to +100°C
- Operating pressure up to 10 bar
- Upper limit of measurement for liquids: 0.4 to 160 l/h (water: 20°C)
- Upper limit of measurement for gases: 5 to 5,000 l/h (air: 20°C, 1.013 bar)
- 2 limit switches (ring initiators)
- Accuracy 1.0 % - 4.0% of measured value acc. VDI/VDE 3513-2 (qG=50%) (depending on length of cone)
- Use in hazardous areas (ATEX)
- Many different process connections
Techical datasheet : DK46,47,48,800.pdf
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