SOLUTION
FLOW SYSTEMS designed and manufactured an Air Flow Meter System that employs a Subsonic Venturi. (For more information, see our
Venturi Brochure--available in hard copy or on the web at
www.flowsystemsinc.com.) The Test Stand controls the pressure inside the vehicle as it undergoes leakage testing, and the pressure inside the vehicle body
may be positive or negative with respect to
the local barometric reading. |
| The Test Stand is designed to deliver 100 to 800 SCFM of air at an accuracy of
+/-2.0% of reading or better, with the maximum static pressure at the vehicle being 2.0 inches H2O. The Test System controller uses venturi inlet Conditions (temperature and absolute pressure) and venturi differential pressure as
inputs to compute mass flow rate.
The Test Stand employs a set of manual valves that are configured to change the flow direction in the Flow Manifold. Indicators on the Operator Interface Panel indicate when the valves are in the correct orientation for Pressure or Vacuum Flowing. Testing cannot start until all the valves have been manually placed in the correct position.
The Test Stand includes an Orifice Meter that allows for automated system verification. The test stand controller software includes procedures to set the flow at various rates and allow the operator to observe the percent difference between the setpoint and the flow meter reading.
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SYSTEM SCHEMATICS
The following illustration shows the Pneumatic and Instrumentation Diagram (P&ID) of the test system.
Click
to view enlarged image
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SOFTWARE OPERATOR INTERFACE
The following image illustrates the operator interface of the test system.
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SPECIFICATIONS
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Flow Elements: One (1) Subsonic Venturi Flowmeter.
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Flow Range: 100 to 800 SCFM.
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Accuracy: +/-2% of full scale, traceable to NIST standards.
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Repeatability: +/-0.5 % as defined as 2 standard deviations divided by the mean of
20 identical samples.
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Vehicle Pressure Range: 0.25 to 2 inches H2O.
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Cycle Time: 10 to 30 seconds depending on percent of maximum capacity.
System Shown with Optional Fog Machine, (Panels Removed for Viewing).
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SYSTEM LAYOUT
The following diagram illustrates the physical layout of the test system.
Click
to view enlarged imaged
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OPTIONS
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Software Customization including database integration, networking,
SPC (Statistical Process Control), and more.
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Custom Automotive Window Seal fixtures.
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Fog Machine.
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On-site installation, training, commissioning and upgrades.
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