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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.

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.

Products

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Cone Differential Pressure Flow Meter
Accuracy
±0.5%
±0.5%
Size
12...609 mm
1/2...24 in.
Repeatability
± 0.1% or better
± 0.1% or better
CV Series Venturi Flow Meter
Availability
Discontinued
Discontinued
Size
50...406 mm
2...16 in.
Temperature Range
Up to 120° C
Up to 250° F
Flow Range
11...75,708 lpm
3...20,000 gpm
V-Brass Series Venturi Low Pressure Loss Flow Meter
Availability
Discontinued
Discontinued
Size Range
12...50 mm
1/2...2 in.
Temperature Range
Up to 120° C
Up to 250° F
Flow Range
0.95...56.8 lpm
0.25...15 gpm
Ellipse® PFA Fire Pump System
Availability
Discontinued
Discontinued
Size
50...406 mm
2...16 in.
Temperature Range
Up to 82° C
Up to 180° F
Pressure Range
Up to 34 bar
Up to 500 PSI
Model PFB Annular Round Fire Pump System
Availability
Discontinued
Discontinued
Temperature Range
Up to 82° C
Up to 180° F
Pressure Range
Up to 34 bar
Up to 500 PSI
Accuracy
±3%
±3%
Venturi PFV Fire Pump System
Availability
Discontinued
Discontinued
Size Range
50...406 mm
2...16 in.
Temperature Range
Max. 120° C
Max. 250° F
Pressure Range
Max. 20 bar
Max. 300 PSI
GM Portable Gauge Kit
Availability
Discontinued
Discontinued
Accuracy
±1.5%
±1.5%
GMD Gauge
Availability
Discontinued
Discontinued
Temperature Range
Up to 82° C
Up to 180° F
Pressure Range
Up to 34 bar
Up to 500 PSI
Accuracy
±1.75%
±1.75%
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%

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