Variable area flowmeters Series M21


Variable area metal tube flowmeters for low flows of liquid, gas and steam. Metallic construction. High performance measurement under extreme working conditions of temperature and pressure. Indication by means of magnetic coupling, low pressure drop and float damping mechanism for gas service. Flow measurement in vertical pipes.

Variable area flowmeters Series M21 Technical specifications:

Suitable for vertical upwards flow

Indicator housing in aluminum. Available in SS 316L on request

Measuring ranges:

  • 0,4 l/h … 1000 l/h H2O
  • 12 Nl/h … 30 Nm3/h air


  • +-4% f.s.


  • ¼” … ¾” BSP, NPT
  • Sanitary connections DN10 … DN25


  • EN 1.4404 (SS 316L)

Local indication


  • Regulating valve
  • Design for high pressure on request
  • 1 or 2 adjustable inductive switches
  • Electronic transmitter with 4-20 analog output 2 wires, Ex version on request
  • Constant flow regulator RCD or RCA
 Variable area flowmeters Series M21