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Rosemount Annubar Flow Meter: Averaging Pitot Tube Multi-Port Elements Guide from Silver Automation Instruments
Quick Answer: The Rosemount Annubar flow meter uses a multi-port averaging pitot tube element to measure differential pressure and calculate gas, steam, or liquid flow. Silver Automation Instruments supplies averaging pitot tube flow meters and DP transmitters for new installations and replacement projects. Send your pipe size, media, operating pressure, temperature, and flow range for a specific quote.
How the Multi-Port Averaging Pitot Tube Works
An averaging pitot tube flow meter inserts a probe across the pipe cross section. The probe has multiple impact ports positioned at equal area zones. The ports face upstream and sense total pressure. A separate downstream port or separate sensor section senses static pressure. The difference between total pressure and static pressure is proportional to flow velocity squared. A DP transmitter converts this signal to 4-20 mA HART output.
In practice most engineers choose a multi-port element over a single point pitot tube because the multiple ports average the velocity profile. This gives a more stable reading in large pipes and reduces errors caused by swirl or asymmetry. The Rosemount Annubar design uses a T shaped or bullet shaped bar. Silver Instruments uses a similar diamond shaped bar for standard process conditions.
Typical Applications and Real Field Conditions
These flow meters work well in oil and gas, steam, water and wastewater, chemical, and food and beverage plants. Common lines include compressed air, natural gas, boiler feed water, saturated steam, superheated steam, and cooling water. Line sizes from DN50 to DN2400 are practical. Process temperatures from -40 °C to 450 °C are common with the right material and transmitter setup. Pressure ratings go up to 10 MPa for 316L stainless steel sensors.
We have seen these devices on many customer sites. A paint manufacturer in Southeast Asia replaced a failing Rosemount Annubar sensor on a 100 mm solvent recovery line. The line runs at 3 bar and 40 °C. Silver Instruments supplied a 316L stainless steel sensor with a 4-20 mA HART DP transmitter. The customer installed it during a weekend shutdown and the loop checked out with the existing flow computer.
Benefits and Limits of Averaging Pitot Tube Meters
Benefits include low permanent pressure loss compared to orifice plates. Installation cost is lower on large pipelines because the sensor is small and can be hot tapped in many cases. The multi-port design works well for gas and steam where a stable velocity profile exists. The device is also easier to inspect than a Venturi tube.
Limits include poor performance on dirty or viscous fluids. Suspended solids can block the sensing ports. Low flow turndown is typically 10 to 1, lower than a Coriolis mass flow meter or electromagnetic flow meter. You need enough straight pipe upstream and downstream. Standard guidance is 20 pipe diameters upstream and 10 pipe diameters downstream for a single elbow. If you have two elbows in different planes, use 30 to 40 pipe diameters upstream.
Rosemount Annubar Replacement or Silver Instruments Equivalent
Rosemount Annubar sensors are common in existing plants. Many users need a replacement element or a complete flow meter package without long lead times. Silver Automation Instruments supplies averaging pitot tube flow meters with dimensions and flange drilling matched to your existing nozzle or retractor assembly. We also supply complete insertion kits for new line installations.
Standard sensor material is 316L stainless steel. Hastelloy C and duplex stainless steel options are available for corrosive media or offshore platforms. The DP transmitter can be a Rosemount 3051S, a Rosemount 3051C, or a Silver Instruments DP transmitter with 4-20 mA HART. You can also connect a PT100 RTD for temperature co
Quote Data and Model Selection
To select the right sensor and transmitter we need a few facts. Tell us your pipe inner diameter in DN or inches, the fluid type, your normal and maximum flow rate in kg/h or m3/h, operating pressure in bar, operating temperature in °C, viscosity in cP if you know it, and pipe schedule or wall thickness. If you have an existing Rosemount Annubar model code, send that code too. We can cross check the sensor dimensions and process connection.
Here is the thing. Many customers only send flow rate and pipe size. That is not enough for a safe quote. The DP cell range depends on the differential pressure produced by the sensor at maximum flow. Fluid density, viscosity, and pipe inner diameter affect this number. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h or m3/h. You can reach our engineers at Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, or WeChat: +86 13512131526.
Price and Delivery for Averaging Pitot Tube Flow Meters
Price depends on line size, material, pressure rating, and transmitter brand. A standard DN100 316L stainless steel averaging pitot tube flow meter with a 4-20 mA HART DP transmitter starts at around USD 680 for export orders. A DN600 insertion model with a Rosemount 3051S transmitter and flanged retractor body is often quoted between USD 1,800 and USD 2,600. These numbers are for reference. Your price will change with material and configuration.
Stock sensors in 316L stainless steel are available for fast delivery. Special alloys and large line sizes normally ship in 2 to 3 weeks. We export to Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Our customers are industrial end users and local distributors in oil and gas, water and wastewater, chemical, food and beverage, and marine sectors.
Frequently Asked Questions
Can Silver Instruments supply a direct replacement for a Rosemount Annubar sensor?
Yes. Many replacement sensors can be machined to match the existing model code, flange size, and insertion length. Send your old Rosemount model code or a photo of the nameplate and we will check compatibility.
What pipe sizes do averaging pitot tube flow meters cover?
Standard sensors cover pipe sizes from DN50 to DN2400. Smaller or larger lines can be quoted case by case. The multi-port element is more useful in larger pipes where single point insertion meters show higher velocity profile errors.
Which transmitter works with an averaging pitot tube?
You can use any differential pressure transmitter with a suitable DP range. Common outputs are 4-20 mA HART, FOUNDATION Fieldbus, and Profibus PA. ATEX Zone 1 certified transmitters are available for gas and chemical plants. Silver Instruments can supply the transmitter, manifold valve, and sensor as one leak tested assembly.
How much straight run does an averaging pitot tube need?
Use 20 pipe diameters upstream and 10 pipe diameters downstream as a minimum for a single elbow. If the upstream piping has two elbows in different planes, a control valve, or a partially open butterfly valve, use 30 to 40 pipe diameters upstream. Flow conditioners can reduce this straight run requirement.
What is the price of a Rosemount Annubar alternative?
A standard DN100 averaging pitot tube flow meter with a 4-20 mA HART DP transmitter starts at around USD 680. Large line sizes, special alloys, and flanged retractor bodies increase the price. Request a formal quote with your pipe size, fluid, pressure, temperature, and flow range.
Contact Silver Automation Instruments for a quote on a Rosemount Annubar replacement or a new averaging pitot tube multi-port flow meter.
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