Tsi, Inc.

Aaron Serafin Avenido

Jason Paul Johnson

Robert C Anderson

Jeremy Jens Kolb

Steven Keith Isvik

Robert Plautz

Russell R Graze, Jr

Various embodiments include an exemplary apparatus and method for insitu calibration of multiple flow-sensing devices within a dilution system. In one example, a calibration and dilution system includes a first mass-flow device to serve as a global reference, a second mass-flow device configured to be coupled to and provide a supply of clean gas to a primary diluter, and a third mass-flow device configured to be coupled to and provide a supply of clean gas to a secondary diluter, where the diluters are pneumatically coupled to one another through a gas-supply line. Multiple valves are coupled to at least the mass-flow devices and the diluters. The calibration and dilution system is arranged so that the mass-flow controllers can be calibrated in-situ without having to remove any of the mass-flow controllers from the calibration and dilution system. Other apparatuses, designs, and methods are disclosed.

Mirror calibration of multiple flow-measurement devices

Various embodiments include methods and systems to dilute a sampled particle-laden aerosol stream in a recirculating type of aerosol diluter system. In one embodiment, a system to dilute a sampled aerosol stream includes an aerosol sample inlet. A primary diluter device includes a first inlet to receive the aerosol stream and a second inlet to receive a filtered portion of the aerosol stream and combining the filtered portion with an additional sampled aerosol stream. A flow diverter device splits at least the sampled aerosol stream into a first portion of the sampled aerosol stream and a remaining portion of the sampled aerosol stream. A filter receives the remaining portion of the sampled aerosol stream and provides a filtered aerosol stream to the second inlet of the primary diluter device. Other methods and apparatuses are disclosed.

Passive aerosol diluter mechanism

Various embodiments include methods and systems to dilute a sampled particle-laden aerosol stream. In one embodiment, a system to dilute a sampled aerosol stream includes an aerosol sample inlet. A filter is coupled in fluid communication with and in parallel with a flow-monitoring device to receive the sampled aerosol stream from the aerosol sample inlet. The flow-monitoring device is configured to allow for a passage of particles contained in the sampled aerosol stream. A pressure sensor and a temperature sensor monitor the filter and the flow-monitoring device. An output from the filter and the flow-monitoring device may be directed to particle measurement or particle sizing instrumentation. An actual dilution ratio of the output sent to the particle measurement or particle sizing instrumentation is determined based on a nominal flowrate of the flow-monitoring device and thermodynamic properties of a gas comprising the aerosol stream. Other methods and apparatuses are disclosed.

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Minneapolis, MN, United States of America

Aaron Serafin Avenido