Air sampler with compensating pump motor speed
US6741056B1 · kind B1 · utility
11Cited by
16References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 15, 2002 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | May 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A constant flow of air through a personal air sampler is provided regardless of changes in the air flow path, by altering the pump speed as a function of the power taken by the pump. The characteristics of the pump are precalibrated to provide a constant used together with the square of the voltage appearing across the motor armature coils (applied voltage minus back Emf), which reflects the power currently used, to adjust the motor speed and thus provide a constant flow of air under changing conditions of resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.