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Differential Pressure Flow Meters

Differential Pressure (DP) flow meters introduce a constriction in the pipe that creates a pressure drop across the flow meter. This technology is suitable for applications, including DP measurement across filters, heat exchangers, backflow preventers, pipelines, ducts and more.

Differential Pressure Flow Meters

No Moving Parts. No Extensive Maintenance.

Differential pressure technology is a leading choice of measurement technology that provides a reliable and long-term solution. 

  • Minimal Maintenance. Has no moving parts, which virtually eliminates routine system maintenance for facility managers and other key stakeholders.
  • Custom Solutions. Available as a custom engineered solution specifically manufactured to fit within your system.
  • Application Flexibility. Suitable for a number of applications, including across filters, heat exchangers, backflow preventers, pipelines, ducts and more.

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How It Works

  • Measuring Principle
  • How It Measures
Measuring Principle
Measuring Principle

Differential pressure meters use Bernoulli’s equation to measure the flow of fluid within a pipe. Bernoulli’s equation determines that pressure drop across the constriction is proportional to the square of the flow rate.

How It Measures
How It Measures

Measures the flow of liquid within a pipe by introducing a constriction that creates a pressure drop. Pressure sensors measure the pressure before and after the constriction. The resulting pressure drop that occurs across the constriction is relative to the square of the flow rate; a higher pressure drop equals a higher flow rate.


Featured Product Lines

Preso

Preso®

Preso® Differential Pressure flow meters are precision-engineered to offer exceptional turndown ratios and superior accuracy. Designed to accommodate any manufacturer’s pressure transducer, the Preso® family offers a complete line of primary flow elements including Pitot tubes, venturi meters and wedge meters.

Products

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COIN® Wedge Wafer
(Model NW) Flow Meter
Size
13...101 mm
1/2...4 in.
Temperature Range
Max. 426°C
Max. 800°F
Pressure Rating
Dependent on flange rating
Dependent on flange rating
Accuracy
(uncalibrated) ±3% (calibrated) ±0.5%
(uncalibrated) ±3% (calibrated) ±0.5%
COIN® Back-to-Back Wedge (Model NN) Flow Meter
Size
12...152 mm
1/2...6 in.
Temperature Range
Max. 426°C
Max. 800°F
Pressure Range
Dependent on flange rating
Dependent on flange rating
Accuracy
(uncalibrated) ±3% (calibrated) ±0.5%
(uncalibrated) ±3% (calibrated) ±0.5%
COIN® Butt Weld Wedge
(Model NB) Flow Meter
Size
12...406.4 mm
1/2...16 in.
Temperature Range
Max. 426°C
Max. 800°F
Pressure Range
Dependent on flange rating
Dependent on flange rating
Accuracy
(uncalibrated) ±3% (calibrated) ±0.5%
(uncalibrated) ±3% (calibrated) ±0.5%
COIN® Flanged with NPT Pressure Taps (Model NF) Flow Meter
Size
12...1,219 mm
1/2...48 in.
Accuracy
(uncalibrated) ±3% (calibrated) ±0.5%
(uncalibrated) ±3% (calibrated) ±0.5%
COIN® Wedge, Flange Process by Flange Instrumentation (Model FF) Flow Meter
Size
12...1219 mm
1/2...48 in.
Temperature Range
Max. 815°C
Max. 1500°F
Pressure Range
Dependent on flange rating
Dependent on flange rating
Accuracy
(uncalibrated) ±3% (calibrated) ±0.5%
(uncalibrated) ±3% (calibrated) ±0.5%
Cone Differential Pressure Flow Meter
Size
12...609 mm
1/2...24 in.
Accuracy
±0.5%
±0.5%
Ellipse® AR Annular Flow Meter
Size
50…1820 mm
2...72 in.
Temperature Range
Max. 426°C
Max. 800°F
Flow Range
20…130,000 lpm
5.3...34,340 gpm
Pressure Range
Max. 55 bar
Max. 800 psi
Accuracy
±0.75%
±0.75%
Ellipse® AF Annular Flanged Flow Meter
Size
50…3048 mm
2...120 in.
Temperature Range
Max. 426°C
Max. 800°F
Flow Range
20…130,000 lpm
5.3...34,340 gpm
Pressure Range
Max. 55 bar
Max. 800 psi
Accuracy
±0.75%
±0.75%
Ellipse® AS Annular Steam Flow Meter
Size
50…1828 mm
2...72 in.
Temperature Range
Max. 250°C
Max. 480°F
Flow Range
10…80,000 lpm
2.6...21,130 gpm
Pressure Range
Max. 41 bar
Max. 600 psi
Accuracy
±0.75%
±0.75%

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Find a distributor
Our extensive global network of distributors is ready to serve you in your local language at your time zone.

For Europe and Africa

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For the United Arab Emirates