Gas sample selector

US12320786B2 · kind B2 · utility

Assignee

• AGILENT TECHNOLOGIES, INC. · US

Inventors

• Kaike Zhu · Shanghai, CN
• Chenxi Chen · Shanghai, CN
• Wei Yao · Shanghai, CN

Key dates

• Filing date: Oct 29, 2019
• Grant date: Jun 3, 2025
• Expiry date: Feb 27, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2030/402
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A gas analyzer system (100, 200, 300) and methods of reducing sample carryover in a gas sample selector (102, 202, 302), The gas analyzer system (100, 200, 300) includes a gas chromatograph (104, 204, 304) and a gas sample selector (102, 202, 302). The gas sample selector (102, 202, 302) includes a multi-position selector valve (130, 230, 330), a flush valve (140, 240, 340), and a purge valve (150, 250, 350), as well as conduits providing flowpaths between them. When switching the flush valve (140, 240, 340) to connect the flush valve (140, 240, 340) vent and flush valve (140, 240, 340) outlet and flowing purge gas through the purge valve (150, 250, 350) port, the purge gas will flow to the selector (102, 202, 302) exit and to the flush valve (140, 240, 340) vent to remove sample gas from the flowpaths.