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Preso® differential pressure flow meters type Ellipse® model PFA

Water pump system

Preso Differenzdruck-Durchflussmesser Typ Ellipse, Modell PFA Firepumpsystem
  • Low pressure drop
Medium:
Water, Gas
max. flow:
from 20 up to 75000 l/min
Temperature:
from 0 up to 80 °C
max. pressure:
from 0 up to 34.5 bar
Branch:
Pharmaceutical industry, Gas industry, Water & waste water industry
Preso® differential pressure flow meters type Ellipse® model PFA
Preso® differential pressure flow meters type Ellipse® model PFA

General information

The type Ellipse® of Preso® covers the whole range of differential pressure flow measurement. Preso's patented elliptical design outperforms and provides great turndown ratio 17:1 and lowest pressure drop.

The model measures liquids, gases or steam in pipe sizes from DN 50 to DN 3050 (2 "to 120") with an accuracy of ±0.75 % of reading.    


Technical data

FluidLiquids
Pipe sizeDN 50 to DN 400
Pressure27 bar
Temperature120 °C
Accuracy±0,75 % of reading
MaterialStainless steel, brass, polycarbonate


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