Patent ID: 7921739
Filing Date: 2011-04-12
Classification: G01N

Abstract:
1. A method for in situ sampling and monitoring of a fluid flowing in a flow path, where the fluid is to be directed to a chamber, where a first flow section and a second flow section provide connections for fluid flow between the chamber and the flow path and where a first valve is provided to allow the fluid to flow through the first flow section and, a second valve is provided to allow the fluid to flow through the second flow section, the method comprising the following steps: a) opening the first valve and the second valve to let the fluid flow through the first flow section to the chamber and from the chamber through the second flow section into a continuation of the fluid flow path; b) allowing fluid to circulate through the chamber for a certain time and loading a gas cavity which comprises a separation membrane separating the gas in the gas cavity and the fluid being loaded, thereby allowing pressure to build up in the gas cavity; c) trapping the fluid in the chamber by closing the second valve and thereafter closing the first valve; d) opening a valve for reducing the pressure, to obtain a pressure in the chamber which is suitable for monitoring the fluid; e) using the accumulated pressure in the gas cavity to force the fluid trapped in the chamber into a monitor system through an access valve wherein the fluid is analyzed, and thereby providing data representing characteristics of the fluid; and f) providing an exit for the fluid analyzed through a further fluid path.