Flap-type or sight flow indicator with option of flow monitoring

Prima is a flap-type flow indicator with high resilience and suitable for operating temperatures of up to +100 °C at an operating pressure of up to 10 bar. The flap indicator is recommended in particular for cloudy and opaque liquids and transfers the motions of the indicator via a magnet attached to the flap. That shows the flow on the scale. In addition to this, an optional inductive contact also makes flow monitoring possible in the measurement indicator.


The Prima flap indicators ensure control / display for the flow of liquids in closed pipelines. The Prima mechanical flow meter can also be equipped with an inductive contact for remote transfer of switching points.

The Prima flap meter is used in the following industries:

  • Building services equipment, air conditioning and heating technology
  • Chemicals
  • Plant and mechanical engineering
  • Water and wastewater

Advantages of the flap indicator:

  • Very robust design
  • Suitable for clear and cloudy liquids
  • Vertical and horizontal installation possible
  • Practical, low-maintenance design
  • Largely independent of viscosity
  • Suitable for liquid temperatures of up to max. +100 °C
  • Inductive contact for flow monitoring (optional)

Measuring tube connections:

  • Flange EN 1092-1: DN 15 - DN 150
  • ANSI B16.5: 1" - 6"
Measuring ranges 0,5 – 160 m³/h
Accuracy class ± 5 % of URV
Pressure limits max. 10 bar
Temperature limits 0 °C to +100 °C
Flow directions vertically upwards
horizontally from left to right
horizontally from right to left
Process connections Flange (DIN 2501): DN 25 – DN 150
ANSI B16.5: 1“ – 6“
Options Inductive contact


  • Maintenance / repair

Product advice

If you have any questions or require a custom solution please call us or write us.
We look forward to hearing from you.

Your contact partner

Michael Jüch
Sales Director
Tel.: +49 (0)2237 60006-14

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