Averaging pitot tubes (APT) measure the difference between the flowing pressure (Impact Head) and the static pressure (Static Head). Multi-port Averaging pitot tubes are DP flow elements used for flow measurement of gases, vapors and liquids. In comparison to DP flow elements according to ISO 5167, they offer low pressure losses, flexible and low cost installation. They are not recommended for slurry, high viscous fluids.


Averaging pitot tubes(APT) work in a similar fashion to other type of flow elements. The APT is mounted into the pipe and spans the complete flow profile in the pipe. It is divided into two pressure chambers (upstream and downstream), with multiple bore holes.

The impact pressures sensed by upstream ports continually average the flow profile in an isolated plenum chamber, while the static pressure at the downstream port is sensed in a second isolated chamber. The differential pressure between the sides is measured outside of the pipe and is proportional to the square root of the flow rate.

This reduces the requirements for a uniform flow profile, i.e. it reduces the required straight pipe length in front of the pitot tube. APT features very low pressure loss, typically less than 10% and easy, cost effective installation.

Typical accuracy of measurement is +/- 1% of actual flow.

  • In-line
  • Insertion (single and double support)
  • Hot-tap versions (Retracting mechanism)
  • APT Element Profile: Circular Probe Size : ½”,1”, 2 3/8”Line size: 2” to 72”Process Connection: Screwed or Flanged

Averaging Pitot Tubes