Improvements in thin film sensors are disclosed. These can be used for aircraft applications. Dielectric isolation washers can be provided between a pressure sensor and an exterior metal housing of a sensor assembly. In this manner, high voltage inputs from a lightning strike or other source that reach the sensor housing are not transmitted to the sensor. Dielectric washers, insulators, and potting compounds can thus isolate a metal thin film pressure sensor from adjacent metal components (e.g., using non-conducting insulating materials like Torlon, zirconia and nylon). Besides their high dielectric strength, these materials exhibit compressive strength and resistance to wear, creep and corrosion. Desirable thicknesses for these components are provided. The described thin film pressure sensor embodiments can attain a dielectric rating of 1500 VAC.

A wireless circuit includes a housing having at least one opening, and sensor connected to the housing at the opening. The sensor includes a first layer having a first dimension and a second layer having a second dimension shorter than the first dimension. The second layer may be positioned entirely within the housing and a surface of said first layer may be exposed to an exterior of the housing.

A high-pressure compressor having a hydraulic system and a gas chamber, where the hydraulic system includes a reservoir, connected to a hydraulic fluid chamber by a hydraulic flow path and a pump assembly positioned in the hydraulic flow path, and the compressor furthermore includes a control element controlling the flow of hydraulic fluid in the hydraulic flow path and thereby the pressure in the hydraulic fluid chamber, where the control element and the pump assembly is configured for controlling the pressure of hydraulic fluid in the hydraulic fluid chamber when the compressor is not in operation.

The invention relates to pressure sensors having a membrane having sensor chips having measuring bridges having sensor elements, wherein the membrane is fastened in a housing, with a carrier or as part of a housing, to which membrane a working medium can be applied. The pressure sensors are characterised in particular in that the mechanical stresses resulting from a fastening and/or an installation of the pressure sensors do not influence the measurement result and/or the measurement signal. To this end, at least two sensor chips, which are spaced apart from one another and are offset at an angle to one another, are located at least on a side of the membrane that bends on application of pressure. The measuring bridges are designed and/or connected to a controller in such a manner that at least one force resulting from the fastening of the membrane and thus acting on the membrane is or will be compensated.

A pressure gauge and/or relief valve which may be used in a single-use fluid system, such as a sterilizable fluid system. The pressure gauge and/or pressure relief valve may be formed of a disposable and/or sterilizable material, such as a non-metallic (e.g., polymeric) material. The material of the pressure gauge and/or pressure relief valve may be compatible with the material of a fluid-containing structure of the fluid system, such as to be bonded (e.g., welded) therewith. The fluid-containing structure may be retrofitted to integrate the pressure gauge and/or pressure relief valve therewith. The pressure gauge and/or pressure relief valve may have a simple configuration, such as a housing with a movable element therein. The movable element moves with respect to the housing to indicate pressure and/or to relieve pressure from within the housing and/or fluid-containing structure.

Provided is a piezoelectric MEMS acoustic sensor, comprising a substrate, an inner electrode area, and an outer electrode area; the outer electrode area is located at the periphery of the inner electrode area, a lower support layer is provided on the top of the substrate, the inner electrode area and the outer electrode area are located on the lower support layer, and an upper support layer made of silicon-based material is provided on the top surfaces of the inner electrode area and the outer electrode area. The piezoelectric MEMS acoustic sensor has high sensitivity, strong resistance to hydrostatic pressure, and satisfies application requirements of different pressure resistance and operating water depth.

A sensor for detecting the pressure of a fluid has a sensor body having at least one first body part and one second body part. The first body part and the second body part are joined together in such a way that a first face of the first body part faces a first face of the second body part, at a distance therefrom.

The pressure sensor has a circuit arrangement, which includes at least one first electrical circuit that extends at least in part in an area corresponding to a membrane portion and is configured for detecting an elastic flexure or deformation thereof.

The first electrical circuit is associated to the first face of one of the first body part and the second body part, and the first face of the other one of the first body part and the second body part forms or has associated thereto at least one circuit element, prearranged for interacting with the first electrical circuit when an elastic flexure or deformation of the membrane portion is of a degree at least equal to a substantially predetermined limit, to generate thereby information or a warning representative of at least one from among an excessive pressure of the fluid, an incorrect pressure measurement, and an anomalous state of the device.

A pressure sensing device for sensing pressure. The pressure sensing device includes a sealed chamber, a second flexible diaphragm, and a protector member. The sealed chamber includes an upper portion comprising a first flexible diaphragm and a lower portion. The protector member includes a bottom surface with a fist concave shape, a top surface with a second concave shape, and a longitudinal hole between a lower cavity and an upper cavity. The lower cavity is between the first flexible diaphragm and a bottom surface of the protector member. The upper cavity is between the second flexible diaphragm and an upper surface of the protector member.

A micromechanical device that includes a carrier substrate; a sensor device that is situated on the carrier substrate and spaced apart from a surface section of the carrier substrate with the aid of spring elements in such a way that the sensor device is oscillatable relative to the surface section; and at least one stopper element, situated on the sensor device and/or on the surface section of the carrier substrate, which limits a deflection of the sensor device in the direction of the surface section.

An air compressor having a pressure gauge, the pressure gauge contains: a hollow tube, a drive element, an anti-leak spring, a resilient element, and a cap. The hollow tube includes an accommodation chamber, a connector having a conduit, and a display unit. The drive element includes a protection unit, a first open segment, a second distal segment, a receiving portion, a hollow extension, and a protrusion. An anti-leak spring is received in the hollow extension of the drive element, a first end of the anti-leak spring abuts against the protrusion, and a second end of the anti-leak spring contacts with the protection unit. The resilient element is received in the receiving portion of the drive element. The cap includes a seat, a push bolt, and multiple passages. An end of the resilient element contacts with the cap.