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Rosemount™ 405 Orifice Primary Element

The Rosemount 405C Compact Conditioning Orifice Plate features a proprietary 4-hole design for accurate flow in disturbed conditions.

The Rosemount 405 Orifice Primary Element delivers accurate flow measurements, built with either a compact orifice plate or a proprietary 4-hole conditioning plate. This compact design helps eliminate potential leak points and decrease procurement costs, providing a complete and tested flow measurement point. Unlike traditional plates, the conditioning orifice plate reduces pipe straight run, it needs only two pipe diameters upstream of the meter, providing a flexible and reliable metering solution. This flow meter provides measurements for closed loop control, general purpose monitoring, and custody transfer applications. Available in line sizes up to 12 in. (300 mm), it is designed for gas, liquid and steam service and operates well in harsh process conditions.

Key Features

  • Compact orifice plate or proprietary 4-hole conditioning design enables accurate flow measurement in disturbed flow profiles 
  • Innovative orifice plate requires only 2D upstream and 2D downstream to reduce pipe straight-run
  • Does not require impulse lines, special flanges or piping modifications for cost-saving efficiency
  • Offers direct-mount capability for ease of installation
  • Self-centering mechanisms simplify installation and ensure optimal flow measurement accuracy