Patent ID: 7937989
Filing Date: 2011-05-10
Classification: G01F,G01L

Abstract:
1. A device for detecting a physical variable for a process fluid, comprising: a pressure transmitter having a main body, provided with a pressure sensor and a first pressure-sensitive element and a second pressure-sensitive element, operatively connected to said pressure sensor, a first remote separator, designed to be positioned in a first detection position, and a second remote separator, designed to be positioned in a second detection position; a first container having a first end, operatively connected to said first remote separator, and a second end, operatively connected to said first pressure-sensitive element; said first pressure-sensitive element, said first container, and said first remote separator being operatively connected to one another so as to delimit a first closed environment of total volume V a second container having a first end, connected to said second remote separator, and a second end, operatively connected to said second pressure-sensitive element, said second pressure-sensitive element, second container, and second remote separator being operatively connected to one another so as to delimit a second closed environment of total volume V correction means, operatively coupled to said first and second remote separators and to said first and second pressure-sensitive elements, said correction means being arranged outside the main body of said pressure transmitter and being configured so as to exert on said first and second pressure-sensitive elements an action designed to correct at least partially the effect created by differences of temperature existing on or along at least part of said pressure transmitter, first and second remote separators, first and second containers, and surrounding environment, wherein said correction means comprise a first closed hydraulic circuit and a second closed hydraulic circuit, separated from one another, and an end surface of which is delimited by said first pressure-sensitive element and by said second pressure-sensitive element, respectively, said first and second closed hydraulic circuits being filled with said substantially incompressible transmission fluid, wherein said first closed hydraulic circuit comprises at least one first supplementary container having a first end, operatively connected to said first remote separator, and a second end, operatively connected to said second pressure-sensitive element, the second end of the first container and the second end of the first supplementary container being operatively connected to a same first interface flange or wall of the body of said pressure transmitter, and wherein said second hydraulic circuit comprises a second supplementary container having a first end, operatively connected to said second remote separator, and a second end, operatively connected to said first pressure-sensitive element, the second end of the second container and the second end of the second supplementary container being operatively connected to a same second interface flange or wall of the body of said pressure transmitter.