Inter-laboratory comparison exercise cpc calibration material: 2nd stage Focus on soot as harmonized calibration material for Automotive PN counters. Generators:

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Presentation transcript:

Inter-laboratory comparison exercise cpc calibration material: 2nd stage Focus on soot as harmonized calibration material for Automotive PN counters. Generators: Various miniCAST & Palas DNP Goal: The calibration uncertainty of “best practice” soot calibration Apply Lessons Learned from first round: Focus on Counting Efficiency Validate DMA Traveling flow meter Less tests Only two CPCs: 1 reference, 1 device under test Standardized data collection Terres: CPC Calibration Round Robin | Proposal of second stage | 2017-05-22

Inter-laboratory comparison exercise cpc calibration material: 2nd stage Basic procedure: Calibration of circulated EE CPC (D50=23nm) against circulated reference CPC (D50=10nm) with in-house CAST/Palas soot generator Counting efficiency curve, focus on 23nm and 41nm. Possible extras: 10/15/70nm same set-up variance (at BMW) Circulated devices (possible provider): Reference CPC (D50: 10nm) (TSI?) Engine Exhaust (EE) CPC (D50: 23nm) (BMW?) PSL vaporizer + traceable PSL particles to check DMA (PTB?) Flow meter (BMW?) Laptop + data collection software “XERO” (Amium?) Temperature/pressure/humidity sensor (connected to laptop) (Amium?) Circulated reference Circulated device under test Terres: CPC Calibration Round Robin | Proposal of second stage | 2017-05-22