Filter bypass

US9702802B2 · kind B2 · utility

Assignee

• Garrett Thermal Systems Limited · GB

Inventors

• Kemal Ajay · Melbourne, AU
• Nitin Vayeda · Melbourne, AU

Key dates

• Filing date: Mar 4, 2011
• Grant date: Jul 11, 2017
• Expiry date: Jan 27, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N15/075
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

There is described a filter arrangement for a particle detector for detecting particles in an environment. The particle detector can include one or more sensors for analyzing fluid in a detection region to produce sensor output. The filter arrangement includes structure defining flow paths, for conveying fluid from the environment towards the detection region, including a first flow path, which includes a filter, and a second flow path bypassing the filter. There is also provided a mechanism for controlling relative flow rates of fluid through the first flow path and the second flow path and a controller configured to receive the sensor output corresponding to at least two relative flow rates and apply logic thereto to generate an output indicative of a condition of the filter.