Patent · US Active

Compensating temperature-induced errors during piston movement

US8297936B2 · kind B2 · utility

5Cited by

8References

12Claims

0Family size

Assignee

AGILENT TECHNOLOGIES, INC. · US

Inventors

Klaus Witt · Keltern, DE
Konstantin Choikhet · Karlsruhe, DE
Alexander Bierbaum · Karlsruhe, DE

Key dates

Filing date	Sep 12, 2007
Grant date	Oct 30, 2012
Priority date	—
Expiry date	Aug 25, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG01N2030/326
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for controlling movement of a piston in a metering device is described. The method comprises supplying a fluid by actuating the metering device's piston, wherein compression or expansion of the fluid causes corresponding temperature variations. The method further comprises superposing a corrective movement onto the piston movement, with the corrective movement at least partly compensating for at least one of thermal expansion and contraction of the fluid induced by the temperature variations. In one embodiment, the corrective movement imposed onto the piston movement comprises two components: a reduction (74) of the compression jump (73), and a subsequent increase (75) of the piston's forward displacement rate (71) during a period (76) of time (72).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.