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Variable Area Flowmeters

RUS H250 M40 руководство по эксплуатации.pdf ENG VA 40 45 manual.pdf RUS DK 46 47 48 800 технические характеристики.pdf RUS DK 32 34 37 M40 технические характеристики.pdf ENG K20 technical characteristics.pdf ENG DK 46 47 48 800 technical characteristics.pdf ENG DK 32 34 37 manual.pdf RUS VA 40 45 технические характеристики.pdf RUS DK 46 47 48 800 руководство по эксплуатации.pdf ENG H250 M40 technical characteristics.pdf ENG VA 40 45 technical characteristics.pdf ENG DK 46 47 48 800 manual.pdf RUS DK 32 34 37 руководство по эксплуатации.pdf RUS H250 M40 технические характеристики.pdf RUS VA 40 45 руководство по эксплуатации.pdf ENG DK32 34 37 technical characteristics.pdf

KROHNE Variable Area Flowmeters (Rotameters)

KROHNE variable area flowmeters are simple, cost-effective, and reliable instruments for measuring the flow of liquids and gases without external power supply. Available in glass versions for low flows and metal versions for industrial processes (up to DN150 / 6"). Optionally equipped with limit switches, 4…20 mA analog output, HART®, Foundation Fieldbus, Profibus-PA.

Operating Principle

The flow lifts a float inside a conical tube. The float height is proportional to the flow rate and is read from a scale (locally) or transmitted electronically. Equilibrium is achieved between the flow force, float weight, and pressure drop.

Description by Series

H250

Modular metal rotameters for liquids/gases with vertical/horizontal mounting capability. Mechanical indicator or electronic (4…20 mA/HART®7, FF, Profibus-PA). Versions M40 (up to 1000 bar, +400°C) and M8. Connections: flanged DN15–150, threaded, hygienic.

VA40

Glass rotameters for basic applications. With MIN/MAX limit switches and optional 4…20 mA. Low pressure drop for gases. Connections DN15–50, -20…+100°C, up to 10 bar.

VA45

Glass rotameters specifically for low-pressure gases (up to 1 bar). Easy reading, for gas supply lines in furnaces and protective systems. Connections DN15–40, hose.

DK37

Metal for low flows in harsh conditions. Mechanical or with 4…20 mA/HART®. Stainless steel/alloys, thread G¼/NPT¼, -40…+150°C, up to 220 bar.

DK32/34

Compact metal for low flows with needle valve, MIN/MAX contacts, and optional 4…20 mA/HART®. Stainless steel, -40…+200°C, up to 220 bar.

DK46/47/48/800

Glass for very low flows (from 0.04 l/h) and sampling control. With valve and contacts. Thread G/NPT, -5…+100°C, up to 10 bar.

DK700

Miniature glass (6 cm length) for low flows (from 2.5 l/h). With valve, thread G⅛, up to 4 bar.

GA24

Glass rotameters in robust steel housing with MIN/MAX contacts. Flanged connection DN15–50, PN40/ASME Cl300, -20…+100°C.

Features

  • Materials: glass, stainless steel, alloys (Hastelloy, titanium), PTFE.

  • Temperature: from -196…+400°C (H250) to -20…+100°C (glass models).

  • Pressure: up to 1000 bar (H250 M40), typically 4–220 bar.

  • Connections: threaded (G, NPT), flanged (DN15–150), hygienic, hose.

  • Output signals: local scale, MIN/MAX contacts, 4…20 mA/HART®, FF, Profibus-PA.

  • Accuracy: typically ±1.6–4% (depending on model and float).

  • Features: low constant pressure drop, explosion-proof versions (ATEX, IECEx), hygienic versions (EHEDG, FDA).

Main Applications

  • Monitoring and regulation of low flows of liquids/gases in chemical, petrochemical, pharmaceutical, and food industries.

  • Laboratories, sampling control, gas purging systems.

  • Protective gas, burner, and furnace supply lines.

  • High-temperature/high-pressure processes (H250), hygienic applications.