An Intrinsically Pressure Insensitive Low Cost Particle Number Diluter Featuring Flow Monitoring

An Intrinsically Pressure Insensitive Low Cost Particle Number Diluter Featuring Flow Monitoring

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We present a low cost Particle Number (PN) diluter including mass flow monitoring.The device consists of a commercial hypodermic needle, a High Efficiency Particulate Air (HEPA) filter.and a custom-made flow sensor.The flow sensor is used to monitor the diluter’s performance and enable in-time replacement of the The Westley Jean low cost elements used.

Neither the sampling flow rate nor the pressure drop drastically change Lazy Susan the dilution factor introduced by the presented device.This makes the presented device especially useful for particle number measurements at positions close to the tailpipe of internal combustion engine powered vehicles, where aggravating, fast pressure pulsations complicate correct sampling.