Products
Rosemount Annubar Flow Measurement
How It Works
The Rosemount Annubar is an averaging pitot tube that creates differential pressure (DP) by partially obstructing flow. High pressure is measured at the front through sensor slots, while low pressure is sensed at the back. The DP transmitter calculates flow by measuring the difference between these pressures.
Take a Closer Look at Annubar Flow Meter Technology
Resources
Flyer: Reduce Energy Use with Rosemount Annubar Flow Meters
Video: How Averaging Pitot Tubes Work
Brochure: Efficient and Accurate Flow Measurement with Annubar Flow Meters
Frequently Asked Questions
If you have additional questions related to Rosemount Annubar, please contact us.
The Rosemount Annubar is widely used in various industries, including oil and gas, chemical processing, power generation, water and wastewater, and HVAC systems. They are ideal for providing accurate and efficient flow measurement of gases, liquids, and steam in a variety of process conditions – particularly those in large line sizes or where permanent pressure loss is of concern.
Proper installation of a Rosemount Annubar is crucial for accurate measurements. The Annubar Reference Manual outlines the steps to ensure the Annubar is installed with the correct orientation and sufficient straight pipe lengths to stabilize the flow profile.
Rosemount Annubars require minimal maintenance due to their rugged design and lack of moving parts. Regular maintenance includes inspecting the Annubar probe for any buildup or damage, ensuring the impulse lines are clear and free of blockages, and verifying the calibration of the differential pressure transmitter. Refer to the Annubar Reference Manual for more details.
The common troubleshooting steps include inspecting the Annubar for physical damage or fouling, checking impulse lines for blockages or leaks, verifying the correct installation and alignment, and recalibrating the differential pressure transmitter. Resolving these issues can help maintain accurate and reliable flow measurements. Refer to the Annubar Reference Manual for further information.
Calibrating a Rosemount Annubar involves verifying the differential pressure transmitter against known standards. Refer to the Annubar Reference Manual for calibration, including ensuring proper zeroing and spanning of the transmitter. Calibration should be conducted under normal operating conditions to ensure measurement accuracy.
The accuracy of Rosemount Annubars typically ranges from ±0.75% to ±1% of the flow rate, providing highly reliable and precise flow measurement for a wide range of applications. Regular calibration and proper installation are key to maintaining this level of accuracy.
Rosemount Annubars are versatile and can measure a wide variety of fluids, including gases, liquids, and steam. They are commonly used in applications where accurate and reliable flow measurement is necessary.
Yes, Rosemount Annubars are designed to withstand high-pressure and high-temperature conditions, making them suitable for challenging environments such as those found in oil and gas, power generation, and chemical processing industries.