Abstract: Retrievable sensor devices and methods are provided that can be easily installed and removed from a sub-sea system without the need to stop the flow of working/process fluid. In particular, a retrievable sensor is provided that can be configured to be located remote from the process fluid to allow for easy access. In other embodiments, an actuator is provided that allows for pressure adjustments to be made during installation and/or removal of the sensor so as to avoid damage to the sensor and/or other system components and to avoid any process fluid/material leakage. Methods are also provided for installing/removing a retrievable sensor, as well as for adjusting a pressure of a retrievable sensor.

Abstract: A separating membrane for use particularly in pressure sensors, for separating between a process fluid and a pressure-transferring hydraulic oil, is described. The separating membrane is in the form of a thin foil covering an opening into a volume containing the oil, with the foil being fastened to the edges of the opening, and is characterized in that the separating membrane is fastened at the edges of the opening in such a manner that it, in at least one region of its area, exhibits a transition from a concave to convex bulging, whereby the membrane is able to accommodate a volume change of the oil through a non-energy requiring translation of the transition(s). Also described are a method of manufacturing the separating membrane as well as a pressure sensor comprising the separating membrane.

Abstract: A retrievable pressure sensor for the in situ measurement of pressure of a process fluid in a pipe/chamber, and an associated method. The sensor includes a pressure-transferring arrangement which includes a device for sealing attachment in an opening in a wall of the pipe/chamber, a cavity containing a pressure-transferring fluid, a first separation diaphragm for separating between the process fluid and the pressure-transferring fluid, and a second separation diaphragm defining an outer boundary of the cavity containing the pressure-transferring fluid.

Abstract: Retrievable sensor devices and methods are provided that can be easily installed and removed from a sub-sea system without the need to stop the flow of working/process fluid. In particular, a retrievable sensor is provided that can be configured to be located remote from the process fluid to allow for easy access. In other embodiments, an actuator is provided that allows for pressure adjustments to be made during installation and/or removal of the sensor so as to avoid damage to the sensor and/or other system components and to avoid any process fluid/material leakage. Methods are also provided for installing/removing a retrievable sensor, as well as for adjusting a pressure of a retrievable sensor.

Abstract: The present invention relates to a retrievable pressure sensor for in situ measurement of pressure in a process fluid in a pipe/chamber. The pressure sensor comprising a pressure-transferring device and an outer sensor part having a pressure sensing element attached at a distance from the pipe/chamber where the pressure is to be measured. The pressure-transferring device comprises a first device for sealing attachment in an opening in a wall of the pipe/chamber where the pressure is to be measured, and has a first separation diaphragm for separating between the process fluid and the pressure-transferring fluid. The pressure-transferring device further comprises a second device for attachment at a distance from the pipe/chamber where the pressure is to be measured. The pressure-transferring device comprises a first cavity with a pressure-transferring fluid, wherein the first cavity comprising a capillary tube for pressure transferring connection between the first device and the second device.

Abstract: The present invention relates to a retrievable pressure sensor for the in situ measurement of pressure of a process fluid in a pipe/chamber, and to a method for retrieving the pressure sensor. The pressure sensor comprises a pressure-transferring arrangement (2) which includes a device for sealing attachment in an opening in a wall of the pipe/chamber, a cavity (7) containing a pressure-transferring fluid, a first separation diaphragm (5) for separating between the process fluid (3) and the pressure-transferring fluid, and a second separation diaphragm (8a) defining an outer boundary of the cavity (7) containing the pressure-transferring fluid.

Abstract: A separating membrane for use particularly in pressure sensors, for separating between a process fluid and a pressure-transferring hydraulic oil, is described. The separating membrane is in the form of a thin foil covering an opening into a volume containing the oil, with the foil being fastened to the edges of the opening, and is characterized in that the separating membrane is fastened at the edges of the opening in such a manner that it, in at least one region of its area, exhibits a transition from a concave to convex bulging, whereby the membrane is able to accommodate a volume change of the oil through a non-energy requiring translation of the transition(s). Also described are a method of manufacturing the separating membrane as well as a pressure sensor comprising the separating membrane.

Abstract: A differential pressure sensor for measuring a pressure difference between two high-pressure environments is comprised of a sensor block including internal, oil-filled channels leading to an internally positioned differential pressure sensor element. Two process diaphragms are provided for transferring pressure from the high-pressure environments for isolating two distinct internal oil channels from the high-pressure environments. In order to achieve small internal oil volumes in the sensor block, additionally two separating discs, which initially separate between the two internal oil channels, are positioned in fluid communication with the high-pressure environments in order to block for the pressure from the high-pressure environments against the oil channels “from behind.” The separating discs bear against abutment faces having small openings into the internal oil channels.

Abstract: A pressure sensor unit consists of a shaft part adapted to be introduced in an opening through a pipe wall or chamber wall, and a flange part fastened on the outer end of the shaft part for providing sealing around the outer end of the opening. The shaft part inner end reaches in to engagement with a process fluid which pressure is to be measured. The inner end is provided with perforations for admitting process fluid into the inner room of the shaft part. In the inner room and straight behind the inner end it is arranged a block which constitute a base for a separating membrane for transferal of the process fluid pressure via a hydraulic pipe to a pressure sensor element in the flange part. The flange part is constructed as a thin walled pipe, which is enabled because of internal pressure equalization. Thus great savings is achieved by production of the pressure sensor unit.

Abstract: The invention relates to a sensor chip, especially for measuring structures in a finger surface, comprising an electronic chip of a per se known type being provided with a number of sensor electrodes for capacitance measurements, the chip being positioned on a substrate being provided with a number of openings or slots through which electrical conductors are provided, the ends of said conductors constituting a sensor array for capacitance measurements so that the sensor array is positioned on a first side of said substrate and the electronic chip is positioned on the other side of the substrate.

Abstract: A differential pressure sensor for measuring a pressure difference between two high-pressure environments is comprised of a sensor block including internal, oil-filled channels leading to an internally positioned differential pressure sensor element. Two process diaphragms are provided for transferring pressure from the high-pressure environments for isolating two distinct internal oil channels from the high-pressure environments. In order to achieve small internal oil volumes in the sensor block, additionally two separating discs, which initially separate between the two internal oil channels, are positioned in fluid communication with the high-pressure environments in order to block for the pressure from the high-pressure environments against the oil channels “from behind.” The separating discs bear against abutment faces having small openings into the internal oil channels.

Abstract: A pressure sensor unit consists of a shaft part adapted to be introduced in an opening through a pipe wall or chamber wall, and a flange part fastened on the outer end of the shaft part for providing sealing around the outer end of the opening. The shaft part inner end reaches in to engagement with a process fluid which pressure is to be measured. The inner end is provided with perforations for admitting process fluid into the inner room of the shaft part. In the inner room and straight behind the inner end it is arranged a block which constitute a base for a separating membrane for transferral of the process fluid pressure via a hydraulic pipe to a pressure sensor element in the flange part. The flange part is constructed as a thin walled pipe, which is enabled because of internal pressure equalisation. Thus great savings is achieved by production of the pressure sensor unit.

Abstract: Sensor chip, especially for measuring structures in a finger surface, characterized in that it comprises an electronic chip of a per se known type being provided with a number of sensor electrodes for capacitance measurements, the chip being positioned on an electrically insulating substrate being provided with a number of openings through which electrical conductors are provided, the ends of said conductors constituting a sensor array for capacitance measurements so that the sensor array is positioned on a first side of said substrate and the electronic chip is positioned on the other side of the substrate.

Abstract: A pressure gauge is arranged to function on the outside of a measuring element. The measuring element has a central cavity and is constituted by at least to parts, which are tightly joined for creation of the cavity. The measuring element has sensor organs for determining the mechanical state of stress of the measuring element during pressure influence. The two parts of the measuring element are manufactured with planar techniques, preferably by silicon or quarts with the cavity running in the longitudinal direction. The central cavity has a considerably greater height than width. The sensor organs have form of piezo-resistive elements arranged near an outer surface of the measuring element.

Abstract: Pressure gauge preferably arranged to function on the outside of a measuring element (1), the measuring element having a central cavity (103) and being constituted by at least two parts (100A-B) which are tightly joined for creation of the cavity, and comprising sensor organs (11-14) for the mechanical state of stress of the measuring element during pressure influence. The two parts of the measuring element (100A-B) are manufactured in planar techniques, preferably by silicon or quarts with the cavity running in the longitudinal direction. The central cavity has a considerably greater height than width. The sensor organs (11-14) have form of piezo-resistive elements arranged near an outer (105) eventually inner surface of the measuring element.

Abstract: The invention relates to a sensor chip, especially for measuring structures in a finger surface, comprising an electronic chip of a per se known type being provided with a number of sensor electrodes for capacitance measurements, the chip being positioned on an electrically insulating substrate being provided with a number of openings through which electrical conductors are provided, the ends of said conductors constituting a sensor array for capacitance measurements so that the sensor array is positioned on a first side od said and the electronic chip is positioned on the other side of the substrate.