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Annubar Flow Meter Rosemount and Proline High-Temperature Gas Measuring Systems
Quick Answer: An Annubar flow meter is a differential pressure insertion meter for gas, steam, and liquid lines. Rosemount Annubar models are a common reference in oil and gas and power plants. Silver Automation Instruments supplies compatible insertion DP meters and Proline high-temperature gas measuring systems with 4-20 mA HART output for pipes from DN50 to DN1200.
Many engineers search for Annubar flow meter Rosemount plus Proline high-temperature gas measuring systems because the original meter is overdue for replacement or the project needs a lower cost alternative. Silver Instruments builds insertion differential pressure meters and package systems for hot gas service. This page covers what to check before you buy.
Rosemount is a product brand of Emerson. Silver Automation Instruments is an independent industrial flow meter supplier. We sell compatible and lower cost insertion DP meters for process gas, compressed air, steam, and biogas.
Where Annubar Flow Meters Fit in Gas Measurement
An Annubar flow meter senses flow using a probe inserted into the pipe. Multiple sensing holes average the velocity profile. A differential pressure transmitter reads the high and low pressure signals. The output goes to a flow computer or PLC. For hot gas, the DP transmitter needs impulse lines and, in some cases, a condensation pot or a remote diaphragm seal.
Typical gas applications include natural gas header lines, compressor discharge air, flue gas, biogas from digesters, and chemical plant off-gas. Because the meter has no moving parts, it survives dirty gas better than a turbine meter. But it needs stable upstream straight run for good accuracy.
Rosemount Annubar vs Silver Instruments High-Temperature Gas Systems
Rosemount Annubar models such as the 485 and 585 are common in refinery and steam systems. The Rosemount name carries brand cost and sometimes long delivery in remote markets. In practice, most engineers skip the brand question and check the material, temperature rating, and transmitter output first.
Silver Instruments offers a direct replacement for many Rosemount Annubar probe sizes. We use 316L stainless steel as standard. For gas temperatures above 350 °C, we quote Hastelloy C or other alloy options. A complete high-temperature gas measuring system includes the probe, a coplanar DP transmitter, a PT100 temperature sensor, and a pressure transmitter for gas density compensation.
Because high temperature changes gas density, mass flow or standard volumetric flow requires pressure and temperature correction. Our package delivers Nm3/h or kg/h output from the flow computer. That output can be 4-20 mA HART, pulse, RS485 Modbus, or optional Profibus DP.
Sizing Data You Need Before a Quote
We cannot quote a gas flow meter properly without four points of data. Send your pressure in bar, temperature in °C, pipe size in DN, and flow range in Nm3/h or kg/h. Also mention the gas composition if it is not air. Here is the thing. A 10 bar compressed air line and a 0.2 bar biogas line use two different probe sizes and transmitters.
For most Annubar style meters, pipe diameters from DN80 to DN1200 are standard. Smaller lines under DN50 often use a thermal mass flow meter or a vortex flow meter. A paint manufacturer in Indonesia once asked us for a Rosemount Annubar replacement on a DN100 natural gas line. The real issue was impulse line blockage from wet gas. We added a drain manifold and filter, and the meter returned stable re
High-Temperature Gas Meter Package Details
Our standard high-temperature gas measuring system covers up to 350 °C and 40 bar. For higher temperatures, we quote a custom probe with alloy materials and a remote mount transmitter. We also supply ATEX Zone 1 certification for gas and dust environments when the site requires it.
Do not overlook the upstream and downstream straight run. Most engineers skip this part but flow profile error is the number one cause of poor accuracy. For an Annubar style insertion meter, we recommend 15D upstream and 5D downstream as a minimum. If your pipe has elbows or valves close to the meter, tell us and we will suggest a flow conditioner.
Annubar Flow Meter Price and Accuracy
A standard Annubar flow meter with 316L probe and DP transmitter delivers about plus or minus 1.0 percent of rate for gas flow when installed with proper straight run and pressure compensation. For custody transfer, you will need a different metering class, but for process control and utility gas this is often enough.
Price depends on pipe size, material, and output. A basic insertion DP flow meter for compressed air starts around USD 900 FOB China. A complete high-temperature gas measuring system with PT100, pressure sensor, and flow computer starts around USD 2,400. Standard delivery is 7 to 12 working days for DN80 to DN600.
FAQ: Annubar Flow Meter and High-Temperature Gas Measuring Systems
What is the difference between Annubar and orifice plate flow meters?
An Annubar flow meter uses an insertion probe with averaging holes. An orifice plate requires a full plate between flanges. Annubar has lower permanent pressure loss and is easier to install in large pipes.
Can I replace a Rosemount Annubar with a Silver Instruments meter without changing the pipe?
Yes. Many probe sizes match standard Rosemount Annubar installation hardware. We need the existing probe length, pipe ID, and flange rating. Send us a photo of the tag plate if available.
What is the maximum gas temperature for your DP insertion meters?
Standard models handle 350 °C. Custom designs using Hastelloy C or other alloys can handle up to 450 °C. We also supply thermal mass meters for low flow hot gas applications.
Why do I need temperature and pressure compensation for gas flow?
Gas density changes with temperature and pressure. Without compensation, the DP meter gives a reading that cannot be converted to mass or standard volume. Our system includes PT100 and pressure transmitter inputs.
How fast can you ship a high-temperature gas flow meter to Nigeria or Saudi Arabia?
Standard systems ship from China within 7 to 12 working days. Air freight to Lagos or Dammam takes 3 to 6 extra days. We also handle export documentation for industrial flow meters.
Request a Gas Flow Meter Quote
Tell us your application and process conditions. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will recommend either an Annubar style insertion DP meter, a thermal mass flow meter, or a vortex flow meter.
Silver Automation Instruments
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
Website: flow-meter.com.au
You can also request a quote for seawater flow meters, oval gear diesel meters for viscosity up to 1000 cP, electromagnetic flow meters for water with 5 µS/cm minimum conductivity, or pressure transmitters on our main flow meter site.