What is Secondary Airflow?
Secondary, or bulk, airflow is the total combustion air delivered through the secondary air duct and wind boxes feeding the boiler. It determines the overall air‑to‑fuel ratio for the furnace, directly influencing boiler efficiency, safety, and emissions performance. Accurate bulk secondary airflow measurement provides operators with the visibility needed to control combustion across the full operating range, from minimum load to peak output. As plants cycle more frequently and run at lower loads, reliable secondary airflow data has become essential for stable, efficient boiler operation.
Why is Secondary Airflow Measurement Critical?
Reduced Fan Power Consumption
Lower operating costs by avoiding the excessive pressure losses associated with traditional high-loss devices.Improved Combustion Efficiency
With tighter controls of the air-to-fuel ratio over a wide turndown range, the overall heat rate can be optimized for better performance.Lower NOx and SOx Emissions
Get better compliance alignment with tightening environmental regulations and plant emissions targets.News & Innovation
Application Guide
Download the Air Monitor Secondary Airflow Measurement Application Guide to learn more about the challenges faced in this application and what solutions are used to combat those issues.Product Brochures & Catalog Sheets
Download product brochures and catalog sheets for all of Air Monitor’s products for pressure management, including our range of static pressure sensors and transmitters.Installation Documents
Here you can download guides for installing the Air Monitor VOLU-probe/FI-SS, the ACCU-flo High Accuracy Stainless Steel Station, and the LO-flo/SS Stainless Steel Pitot Traverse Probe.-
AUTO-purge III
Automated Air Purge System
Electro-pneumatic system automates sensing port debris purging for low maintenance dirty airflow measurement.
Companion System
- Add to flow and transmitter pairings
- Automated pneumatic purging
- Field-selectable purging intervals
- Maintains flow system performance
- Trouble-free operation
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CA Station
Inline Airflow Measuring Station
Differential pressure Pitot airflow traverse array in rectangular & circular constructions for combustion airflow.
0 to 8,000 FPM
- Accuracy: 2-3% of Actual Flow
- Circular/Rectangular; fabricated to any size
- Temperature: ≤800°F
- Carbon steel, Stainless steel
- Built-in flow conditioning
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CAMS™
Combustion Airflow Management
System designed to monitor combustion airflow and purge debris from sensing ports.
Integrated System
- Accuracy: 0.1%
- Temperature and pressure compensated
- Automated pneumatic purging
- Add to flow measurement pairing
- Trouble-free operation
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VOLU-probe/SS
Insertion Airflow Measuring Probes
Stainless steel airflow traverse probe ideal for dirty applications with corrosive, abrasive, and extreme temperatures.
400 to 10,000 FPM
- Accuracy: 2% of Actual Flow
- Temperature: ≤900°F
- Stainless steel, Hastelloy, Inconel, Kynar
- External or Internal mounting
- Easy installation/removal for maintenance
