A diaphragm seal assembly, which includes a measuring instrument, a pressure being transmitted from a process side to be monitored, via an arrangement of two diaphragms having an evacuated intermediate space disposed therebetween, to the measuring instrument, reliably separated from the process side, the fatigue strength of the diaphragm seal assembly under extreme application conditions being improved.

A Bourdon tube pressure gauge includes: a Bourdon tube; a rotary piece rotatably attached to a first shaft arranged near a tip of the Bourdon tube; a pointer including a second shaft arranged on a side facing an outer periphery of the fan-shaped portion of the rotary piece; a first permanent magnet provided on an outer peripheral surface side of a fan-shaped portion of the rotary piece; a second permanent magnet provided at the second shaft. An outer peripheral surface of the first permanent magnet and an outer peripheral surface of the second permanent magnet each has N pole and S pole alternately magnetized at equal pitches. A magnetic member configured to relax force by which the second permanent magnet is attracted to the first permanent magnet is provided across the second permanent magnet from the first permanent magnet.

A method for monitoring air pressure in a kite when kite boarding is described. The method involves a first step of connecting an air pressure sensor to one or more bladders of the kite. The method involves a second step of positioning a visual display for the air pressure sensor where it will be visible to a user conducting a visual inspection of the kite to display a pressure reading as sensed by the pressure sensor.

A Bourdon tube pressure gauge includes: a Bourdon tube; a rotary piece rotatably attached to a first shaft arranged near a tip of the Bourdon tube; a pointer including a second shaft arranged on a side facing an outer periphery of the fan-shaped portion of the rotary piece; a first permanent magnet provided on an outer peripheral surface side of a fan-shaped portion of the rotary piece; a second permanent magnet provided at the second shaft. An outer peripheral surface of the first permanent magnet and an outer peripheral surface of the second permanent magnet each has N pole and S pole alternately magnetized at equal pitches. A magnetic member configured to relax force by which the second permanent magnet is attracted to the first permanent magnet is provided across the second permanent magnet from the first permanent magnet.

A monitoring device is provided having a temperature-compensated pressure-measuring system, in which an electrical notification is output to the outside with use of a plurality of settable threshold values. Also, a high-performance switching system is provided that includes at least one monitoring device.

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 steel measuring element is provided. The steel measuring element is made of an austenitic chromium-nickel steel with a low carbon and nitrogen content for measuring pressure, with an edge zone being provided with increased hardness.

A tire pressure gauge contains a housing, a pressure measuring unit, and a tire-tread depth measuring unit. The tire-tread depth measuring unit includes a mounting assembly, a gear assembly, a hair spring, a covering lid, and a longitudinal post. The tire pressure gauge measures a tire pressure and a tire-tread depth. The tire-tread depth measuring unit indicates a number of the tire-tread depth by using a pointer, after a measurement stem of the longitudinal post is inserted into a tread slit of a tire, and a longitudinal movement of the longitudinal post is transformed into circumference rotation data through the gear assembly, thus indicating the number of the tire-tread depth on a numerical display panel clearly. Preferably, a probe and the measurement stem of the longitudinal post inserted into the tread slit are driven by the hair spring to return to a zero state.

A pressure gauge includes a first fastener, a second fastener, a rotation member, and a positioning module. The first fastener includes a guide portion having a first spiral section and a second spiral section. The second fastener is mounted on the bottom of the first fastener. The rotation member has a shaft provided with a protruding rib and a pointer. The positioning module includes a positioning block having an air hole, and a elastic member having a first end mounted on the air hole and a second end abutting the rotation member. The air hole introduces an air pressure into the elastic member that is expanded and pushes the shaft upward so that the protruding rib and the pointer are rotated and moved upward along the first spiral section and the second spiral section, to precisely indicate visible air pressure values.

A pressure gauge includes a first fastener, a second fastener, a rotation member, and a positioning module. The first fastener includes a guide portion having a first spiral section and a second spiral section. The second fastener is mounted on the bottom of the first fastener. The rotation member has a shaft provided with a protruding rib and a pointer. The positioning module includes a positioning block having an air hole, and a elastic member having a first end mounted on the air hole and a second end abutting the rotation member. The air hole introduces an air pressure into the elastic member that is expanded and pushes the shaft upward so that the protruding rib and the pointer are rotated and moved upward along the first spiral section and the second spiral section, to precisely indicate visible air pressure values.