Measuring device with built-in glass or plastic measuring cone and choice of connections for universal application
The Variable Area Flowmeters are produced with tapered glass tubes designed for the measurement of liquids and gases. The devices are of uniform construction but available with various connections all conforming to standards.

The flowmeters are designed for installation in a vertical pipe run with flow from bottom to top. A customized scale is provided on the measuring glass. The glass cone allows direct indication of the flow value.

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




  • Simple, low-cost installation: Able to measure and display without auxiliary power supply
  • Unique modularity and serviceability: Limit switches, 2-wire 4…20mA
  • 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
  • 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 (SIL 2)
  • Optional hygienic design for use in the food and pharmaceutical industry