Dwyer OP Series Orifice Plate Flow Meter

Dwyer OP Series Orifice Plate Flow Meter is a complete orifice plate flow metering package. It incorporates a stainless steel orifice plate with a unique holder or carrier ring containing metering taps and integral gaskets. It was designed for use wherever there is an application for a conventional flow orifice plate.

It can also be used in place of other primary differential producers for efficiency and cost effectiveness. Installation is accomplished simply by slipping the unit between standard flanges (orifice flanges are not required). The Series OP is available in line sizes from 1/2″ to 24″ and can be used with compatible liquids and gases.

Orifice plate flow meters are differential pressure sensors for flow rate. Can be used with gases, liquids, corrosive, and high-temperature fluids. Applications include steam flow, boiler feedwater, and fluid flow rates in building water lines. Designed for use wherever there is an application for a conventional flow orifice plate.

Dwyer OP Series Features

  • Mounted with standard flanges
  • Standard “corner tap” configuration
  • Corrosion free material
  • Simplified installation
  • Built in metering taps (1/4″ female NPT STD)
  • Proven through a wide range of applications for accuracy and energy efficiency
  • Assures long term reliability and accuracy


  • Fluid flow rates in building water lines
  • Boiler feed water
  • Cooling water
  • Combustion or compressed air
  • Steam flow
Another Article:

Dwyer OP Series Specification

Service Compatible liquids and gases.
Wetted Material 304 SS, Buna-N gaskets.
Accuracy ±0.6% full scale flow. (Beta= .2-.6) ±0.7% for Beta greater than .6.
Temperature Limits -50 to 200°F (-45 to 93°C).
Pressure Limits 150 psi max.
Head Loss 1 – Beta ratio², eg: 1 – 07² = 1 – 0.49 = 51% of the d.p.
Line Sizes 1/2″ to 24″.
Process Connections 1/4″ female NPT.
Installation Standard flange 125#/150# rating.
Pipe Requirements General requirements 10 diameter upstream and 5 diameter downstream.
Weight Varies with line size.

Download Data Sheet: Series OP Orifice Plate Flow Meter

Ref: dwyer-inst.com

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