H250 M40

Variable area flowmeter for liquids and gases

  • Modular design: from mechanical indicator to 4…20 mA/HART®7, FF, Profibus-PA and totalizer
  • Any installation position: vertical, horizontal or in fall pipes
  • Flange: DN15…150 / 1⁄2…6″; also NPT, G, hygienic connections, etc.
  • -196…+400°C / -320…+752°F; max. 1000 barg / 14500 psig

The H250 M40 is the standard variable area (VA) flowmeter for the process and OEM industry. The VA meter combines mechanical flow measurement of liquids or gases with state-of-the-art communication capabilities. The device is modularly extendable. Additional electronic modules can be added or replaced at any time without process interruption. In this way, its functionality adapts to new requirements – from analogue flow measurement without auxiliary power to digital integration into a fieldbus system.

The H250 M40 is available in various materials and in many different versions. The sturdy all-metal flowmeter can be also used in applications with high pressures (up to 1000 barg / 14500 psig), temperatures (-196…+400°C / -320…+752°F) or aggressive media. It even allows installation in horizontal or fall pipes up to DN150 / 6″. A special version for use in hygienic applications is also available. The H250 M40 is intrinsically safe and explosion-proof. Certain variants of the flowmeter with limit switch or analogue output are suitable for use in Safety Instrumented Systems (SIS).

  • Simple, low-cost installation: Able to measure and display without auxiliary power supply
  • Unique modularity and serviceability: Limit switches, 2-wire 4…20mA, totalizer with LCD and pulse output, fieldbus interfaces
  • Universal ex-concept: Explosion proof and intrinsically safe
  • Various stainless steel and alloy sensor materials
  • Optional stainless steel housing for corrosive atmospheres
  • Ingress protection IP66 and IP68 / NEMA4X and NEMA6, IP69K optional
  • Full scale value for liquids: 10…120,000 l/h / 5…32,000 GPH
  • Full scale value for gases: 0.7…2800 m3/h / 25…100,000 SCFH
  • Turndown ratio 10:1 (optional 100:1)
  • Accuracy: ±1.6% (acc. to VDI/VDE 3513, sheet 2)
  • Suitable for use in Safety Instrumented Systems (SIS)
  • Optional hygienic design for use in the food and pharmaceutical industry

Chemical and other process industries

  • Additives (e.g. catalysts, tensides, foam inhibitors, emulsifiers)
  • Acids, bases, phosgene and other chloridic substances, sulphuric substances
  • Condensate and cooling water
  • Nitrogen inertisation of vessels and tanks
  • Sample flow monitoring for process analysis
  • Gas sparging in liquids

Oil and gas industry

  • Injection skids for corrosion-, scale- and hydrate-inhibitors
  • Nitrogen, flue gases etc.
  • Emulsifiers

Machinery and apparatus (OEM industry)

  • Gas seal monitoring for compressors
  • Coolants and cooling water, lubricants, air supply
  • Dry-run prevention of pumps
  • Gas and oil measurement for industrial furnaces

Pharmaceutical industry

  • Demineralised water, alcohol, solvents, insulin etc.
  • Cleaning agents
  • Air measurement in clean rooms

Food and beverage industry

  • Vegetable oil, drinking water, milk, carbon dioxide
  • Cleaning agents

Water and wastewater industry

  • Oxygen sparging into aeration basins
  • Air injection to reduce iron content

Conventional and nuclear power industry

  • Heavy water, borated water, tritium etc.
  • Hydrazine
  • Sulphuric acid
  • Phosphate, nitrogen, hydrogen, sulphur
  • Purified water, saline water etc.
  • Steam, air, gases, boiler washing water etc.
  • Diesel, return fuel oil flows etc.


Variable area flowmeter for basic applications

  • With glass tube, MIN/MAX switches and 4…20 mA
  • Low pressure loss for gas applications
  • Flange: DN15…50 / 1⁄2…2″; also NPT, G, hygienic connections, etc.
  • -20…+100°C / -4…+212°F; max. 10 barg / 145 psig

The VA40 is a glass tube variable area (VA) flowmeter for flow measurement of liquids and gases. The all-purpose flowmeter is suitable for all basic applications up to +100°C / +212°F and max. 10 bar / 145 psi. Typical applications include flow measurement of flushing, purging or inert gases or heating and cooling circuits.

The VA40 operates without auxiliary power supply. The measuring cone, protected by a metal sleeve with a viewing glass, makes it easy to directly read the flow and to observe the medium. The VA meter can also be equipped with two optional limit switches (MIN/MAX) or analogue output (4…20 mA). The flowmeter comes with many process connections and can be used in hazardous areas.

  • Simple, low-cost measuring principle without auxiliary power
  • For direct reading of the flow and observation of the medium
  • Optional MIN/MAX flow switches or 4…20mA for recording and control
  • Full scale value for liquids: 0.4…10,000 l/h / 0.1…2,650 GPH
  • Full scale value for gases: 7…310,000 l/h / 0.25…11,000 SCFH
  • Uncertainty: ±1.0% (acc. to VDI/VDE 3513, sheet 2)
  • Turndown ratio 10:1
  • Use in hazardous areas
  • Available as food and pharmaceutical variant (with FDA compliant materials)

Machinery and apparatus (OEM industry)

  • Air and cooling water supply
  • Gas measurement for industrial furnaces and thermal processes
  • Measurement of protective gases

Pharmaceutical industry

  • Demineralised and ultrapure water, alcohol, solvents, insulin etc.

Food and beverage industry

  • Air or water supply, alcohol, nitrogen, carbon dioxide (CO2)

Conventional and nuclear power industry

  • Water monitoring in auxiliary circuits

*More instruments are available, please liaise with us if any of your required instruments is not listed above.