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Rosemount™ 485 Annubar™ Primary Element
rosemount 485 annubar primary element
Built with a patented design, the Rosemount 485 Annubar Primary Element is an averaging pitot tube that delivers reliable measurement accuracy over a wide flow range.
This sensor maintains a small profile in the pipe to reduce permanent pressure loss and increase energy savings. This T-shaped sensor is capable of temperature, pressure and flow measurements via a single pipe penetration.
Rosemount™ 485 Annubar™ Primary Element


Max. Operating Pressure
ANSI B16.5 2500#
Process Temperature Range
-148 to 850 °F (-100 to 454 °C )
Fluid Type
Liquid, gas, steam
Process Wetted Material
316/316L SST, Alloy C-276
Up to 5-year limited warranty


  • Patented T-shape sensor creates a fixed separation point for DP signal improvement over a wider flow rate
  • Sensor stagnation zone positioned to reduce noise, measurement inaccuracies and keeps particulates from clogging
  • T-shape design offers very low permanent pressure loss
  • Integral thermowell adds process temperature measurement without additional pipe penetrations
  • Lightweight design at large line sizes provides a cost-effective primary element solution