Air-Flow Large-Ducts
Power and Plant Utilities Duct Air
Flow
Verabarฎ
A New Idea in Duct Air
Flow Measurement
The Veris Verabar is designed to be the most reliable,
accurate and repeatable method of measuring volumetric or
mass airflow in round and rectangular ducts. In power and
plant utility measurement, the Verabar delivers precise
control of combustion airflow to ensure proper fuel to air
ratios yielding more stable and complete combustion. This
minimizes NOx and CO emissions and optimizes plant performance.
Critical Combustion Airflow Applications
Primary Air
Secondary Air
Overfire Air
Individual Burner Air
Flue Gas
Re-circulating Flue Gas Flow
Selective Catalytic Reduction
Problems Associated with previous
Measurement Technologies
Airfoil
High permanent pressure loss, difficult to install and
maintain, prone to clogging and questionable accuracy due
to lack of test data.
Thermal Dispersion
Requires testing and calibration at different flow rates,
no means of checking calibration and can cause excessive
downtime due to rticulate build-up and corrosion.
Averaging Pitot Array
Difficult to install requiring cutting out duct sections,
low differential pressure signal,prone to clogging of sensor
ports and no test data to support accuracy and straight
run claims.
Higher Accuracy in Square and Rectangular
Ducts
The Verabar flow calculation program adjusts the flow
coefficient to compensate for the higher drag in the corners
of the duct.
Verabar Accuracy Verified by Independent
Tests
Independent flow tests verified the Analytical Model
and predicted flow coefficients within ฑ1/2%
The Verabar Solution
The Verabar is guaranteed for 5 years to deliver outstanding
performance even in the most hostile environments.
High temperatures up to 1000ฐF (540ฐC)
Heavy particulate without requiring a purge system
Moisture laden air
Corrosive atmospheres
The Verabar Bullet Shape produces the most accurate
pressure distribution.
Unique side location of low-pressure ports prevents
clogging and produces a stable, nonpulsating signal.
Dual averaging of low pressure orts assures the highest
accuracy and repeatability in minimum straight run applications.
Solid non-leak, one-piece construction.
Simple and Easy Installation Regardless
of Duct Configuration
Depending on the size and shape of the duct, one or two
Verabars can be directly inserted through a simple weld
coupling. No cutting of the duct is required. Veris engineers
are available to assist in determining the exact location
for maximum performance even in the most difficult short
straight-run duct configurations.
Verabar provides easy installation from top, bottom or
side.
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