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Preso® differential pressure flow meters type Ellipse® model AHF

Pitot tube meter, annular flanged hot tap

Preso differential pressure flow meters type Ellipse AHF
  •  No moving parts
  • Low pressure loss


max. flow:
from 20 up to 40 l/min
from 0 up to 425 °C
max. pressure:
from 0 up to 55 bar
Chemical industry, Oil industry, Gas industry, Water & waste water industry
Preso® differential pressure flow meters type Ellipse® model AHF
Preso® differential pressure flow meters type Ellipse® model AHF

General information

This model has been designed for metering saturated and superheated steam.

Measuring principle

Diff. pressure flow meters/Venturi tubes

Diff. pressure flow meters/Venturi tubes

Due to the conical design of the venturi tubes, the flow of a fluid (gas, water, air) at the narrowest point of the low-pressure (p2 = dynamic pressure) results in the accumulation of the medium and at the outlet of the constriction the highest pressure is forming (p1 = static pressure). The pressure difference (incompressible, without friction) for liquids generated by the Bernoulli equation.

Pitot tubes also work on the basics of the Bernoulli equation. In contrast to the venturi tube, work is done with the help of a second tube which is oriented parallel to the flow of the medium, such that the flow impinging on a front pipe opening. In front of the tube is formed the dynamic pressure, behind the tube, the static pressure. This remains constant.

By different shaped pipe openings, measurement results can be affected. By the elliptical shape of the shaft, lowest permanent pressure loss (type Ellipse®) is achieved. In contrast trapezoidal pipe openings create strong vortex shedding in the measuring body and thus impede the flow, resulting in a very high flow resistance. All devices can be used both vertically and horizontally.

Do you have questions on this product?

Your contact person:

Badger Meter Swiss AG
Mittelholzerstrasse 8
CH-3006 Bern