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SOLUTION
Flow
Systems
designed and manufactured an Air Flow Meter
System that employs a Thermal Mass Flowmeter.
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 MBLTS is
designed to deliver 5 to 150 SCFM of air at
an accuracy of 4.0% of reading or better,
with the maximum static pressure at the
vehicle being 2.0 inches H2O.
The Test Stand will allow the operator to
change the flow direction.
Indicators
on the Operator Interface Panel display when
the system is in either Pressure or Vacuum
Flow Mode.
The Test Stand includes a Flow Nozzle 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 flow nozzle
and the flow meter reading.
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Vaccum
Mode
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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)
Thermal Mass Flowmeter.
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Flow Range:
5 to 150 SCFM.
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Accuracy:
+/-
4 % 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
30 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.
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SYSTEM LAYOUT
The following diagram illustrates the physical layout of the test system.
Click
to view enlarged image
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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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On-site Installation, Training, Commissioning and Upgrades.
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