The invention relates to a method for producing a Bourdon tube pressure gauge 1, comprising at least a housing 2, a Bourdon tube 3 and a process carrier 5, wherein the process medium enters the Bourdon tube 3 via a fluid channel starting from the process carrier 5 and the process carrier 5 is constructed in two parts, wherein a first part is connected to the Bourdon tube 3 as a spring carrier 4 and a second part serves as a connecting element 18 and both parts are joined and connected in the housing 2. In order to enable a low bearing retention, it is provided for the manufacture of a Bourdon tube pressure gauge 1 that the connecting element 18 and/or the spring carrier 4 has a round shoulder 17, 23 and the shoulder 17, 23 is inserted into a radial bore 7 of the housing, wherein first a connection is made between the shoulder 17, 23 of the connecting element 18 and spring carrier 4 and then a connection of the shoulder 17, 23 to the housing 2. Thus, it is possible to provide different connecting elements 18 as well as spring supports 4, which are only assembled and welded together according to the customer's requirements, whereby these are accommodated in a housing 2 and welding to the housing 2 also takes place, so that the Bourdon tube pressure gauge 1 to be finished can be assembled individually in each case.

The invention relates to a density monitor (10) for monitoring a gas density in a gas chamber (20). The density monitor (10) comprises a measuring apparatus (12) having a first measuring device (24) and a second measuring device (28), the two measuring devices (24; 28) being coupled together. The first measuring device (24) is designed to measure a first pressure range (62) in relative terms with respect to an atmosphere, and the second measuring device (28) is configured to measure a second pressure range (64) in absolute terms. The density monitor (10) further comprises an indicator device (50), which is designed to indicate the two pressure ranges (24; 28). The density monitor (10) also comprises a movable drive element (48), which is designed to drive the indicator device (50), wherein at least one of the two measuring devices (24; 28) is designed to move the drive element (48) in order to drive the indicator device (50), wherein the indicator device (50) comprises an indicator element (58) which is designed to indicate the two pressure ranges (62, 64).

Provided are a maintenance-free gas density relay and a mutual check method therefor. The maintenance-free gas density relay includes a gas density relay body and first gas density detection sensors which are in communication on gas paths, and an intelligent control unit connected to the gas density relay body and the first gas density detection sensors separately, where the intelligent control unit compares and checks a first pressure value and a second pressure value acquired at the same gas pressure, and/or compares and checks a first temperature value and a second temperature value acquired at the same gas temperature, or compares and checks a first density value and a second density value acquired at the same gas density, and can further upload received data to a background for data comparison by the background. The present disclosure further completes online self-check or mutual check of the gas density relay while being used for monitoring gas density of a gas-insulated or arc-control electrical apparatus, thereby improving efficiency, avoiding maintenance, reducing cost, and ensuring safe operation of a power grid.

A pressure sensor layout structure includes: a bumper beam; an absorber disposed at a front of the bumper beam; a pressure tube arranged between the bumper beam and the absorber; a pressure sensor attached to an end of the pressure tube; and a sensor cover fixed to a rear surface of the absorber, wherein the sensor cover is fixed to an end portion in a vehicle width direction of the absorber, at two or more positions which are located variously in the vehicle width direction.

The present application provides a self-diagnostic gas density relay and a use method thereof, the gas density relay includes a gas density relay body, a gas density detection sensor, at least one diagnostic sensor, and an intelligent control unit; where the diagnostic sensor is configured to acquire deformation quantities of components that generate deformations, and/or positions or displacement quantities of components that generate displacements when the pressure changes, or the temperature changes, or the gas density changes in the gas density relay body; and the intelligent control unit is respectively connected with the gas density detection sensor and the diagnostic sensor, receives data acquired by the gas density detection sensor and/or the diagnostic sensor, and diagnoses a current working state of the gas density relay body. The present application is used for monitoring a gas density of the gas-insulated or arc-extinguished electrical equipment, and at the same time, on-line self-inspection for the gas density relay is completed, so that efficiency is increased, no maintenance is realized, operation and maintenance costs are greatly reduced, and safe operation of a power grid is guaranteed.

A flow-through pressure transducer comprising a cylindrical diaphragm positionable to allow fluid to flow therethrough which responds to variations in fluid pressure to generate an electrical signal proportional to such variations and which is incorporated in a housing for interconnecting with fluid delivery tubing. The diaphragm is made of relatively thin resilient metal, shaped to be a tube, elliptical in cross-section, with transducers, located on the elliptical major and minor axes which change their electrical state in response to movement of the diaphragm walls, and which are coupled in a bridge circuit for signal measurement. The housing is constructed for either gage or absolute fluid pressure measurements.

A pressure gauge includes a housing, a helical tube, and a compensation member. The housing has an inlet. The helical tube is arranged within the housing and has a closed end and an open end, the open end of the helical tube in fluid communication with the inlet. The compensation member is arranged between the between the open end and the closed end of the helical tube, the compensation member fixed to the helical tube. The compensation member and the helical tube are formed from materials having different coefficients of thermal expansion to limit movement of the closed end of the helical tube due to temperature change of a compressed fluid in fluid communication with the helical tube. Pressure vessel assemblies and methods of displaying pressure in pressure vessels are also described.

A pressure measurement device is configured to adjust a gas pressure in an external gas cavity that is fluidly coupled thereto and measure the adjusted gas pressure in the external gas cavity. The pressure measurement device includes a port, a pressure control module, a port pressure sensor, and a gas discharging port. The pressure measurement device is fluidly coupled to the external gas cavity through the port. The pressure control module is coupled to the port through a gas passage and configured to operably provide pressurized gas to the external gas cavity or draw gas from the external gas cavity. The port pressure sensor is coupled to the port and configured to measure a gas pressure at the port. The gas discharging port is coupled to the port and the pressure control module, and configured to operably discharge gas from the port or the pressure control module to an external environment.

The invention relates to a pressure gauge for measuring the pressure of a fluid, the pressure gauge being designed for a pressure range with a maximum pressure, with: a housing with a housing wall which is filled with a filling fluid; a pressure connection located in the housing wall; a tubular spring located in the housing and connected to the pressure connection, whereby a fluid can flow through the pressure connection into the tubular spring, whereby the tubular spring is designed to expand in the direction of the housing wall when pressure is applied by the fluid, thereby mechanically acting on an indicator to indicate the pressure of the fluid; and at least one volume reduction element which is at least partially located in the housing between the tubular spring and the housing wall in the direction of expansion of the tubular spring, whereby the at least one volume reduction element is an injection-molded plastic part.

A contact detection apparatus includes a bumper beam, an absorber, a contact detection sensor, a tube holder, a cover, and first and second protrusions. A pressure tube is held in a groove of the tube holder. The cover is attached to a front end of the tube holder. A pressing member of the cover is disposed inside an opening groove of the groove and in front of the pressure tube. The pressure tube includes first and second protrusions on its outer periphery. The first protrusion projects in a frontward direction, faces the pressing member in frontward and backward directions, and has a pair of upper and lower surfaces inclining in respective directions to come closer to each other as the upper and lower surfaces extend in the frontward direction as seen in a vehicle width direction. The second protrusion is disposed above the first protrusion in an upward direction.