A system for mounting a differential pressure indication device for indicating a presence of a directional differential pressure between a first space and a second space separated from the first space by a barrier is provided. The system may include a base configured to be mounted against the barrier, where the base includes a receptacle configured to removably receive the pressure indication device. The system may include at least one mounting fastener configured to removably secure the differential pressure indication device within the receptacle. The system may include a pitch adjuster configured to secure the base to the barrier, where movement of the pitch adjuster is configured to adjust a spacing between a portion of the base and the barrier to adjust the orientation of the base with respect to pitch.

The invention relates to a pressure relief device (1) for a housing (2) which is protected against explosions, in particular is compression-proof and has a wall connecting piece (3) which can be at least partially inserted into a housing opening (4) of a housing wall (6) by its insertion connecting piece section (5), which can be in particular detachably fixed from an inner side of the housing and rests from the outside on an opening edge (8) of the housing opening (4) in its inserted and fixed position with a radially outwardly projecting support flange (7), wherein the insertion connecting piece section (5) furthermore comprises a projecting connecting piece section (9) which is opposite the insertion connecting piece section relative to the support flange (7) and comprises a longitudinal conduit (10) running through the wall connecting piece (3) into which conduit a flame-blocking body (11) is replaceably inserted, wherein a pressure nut (13) which loads the flame blocking body (11) with pressure in its insertion position and with a pressure edge (14) projecting radially inward at least in sections can be screwed onto a free end section (12) of the projecting connecting piece section (9), and wherein the pressure edge (14) contacts an outer viewing side of the flame blocking body (11).

A sensor module includes a sensor module body, a sensing element within the sensor module body that senses a characteristic of an environment, a breathing element within the sensor module body that allows the sensing element to access the environment, electronics within the sensor module body coupled to the sensing element, and wherein the sensor module body forms a wall of a flame path.

Example systems, apparatuses and methods are disclosed for detecting a gas leak. An example system comprises a sensor sub-module, a processor sub-module, and a barrier structure configured to restrict flame spread between the sensor sub-module and the processor sub-module. The barrier structure comprises a first housing part, a second housing part, and a printed circuit board disposed in a cavity structure formed by the first housing part and the second housing part. The barrier structure further comprises a first electrical connector configured to provide a first electrical connection to the sensor sub-module. The barrier structure further comprises a second electrical connector configured to provide a second electrical connection to the processor sub-module.

An apparatus includes a sensor body, a sensor configured to measure differential pressure, and first and second pressure inputs in or on the sensor body. The pressure inputs are configured to provide multiple input pressures to the sensor. Each pressure input includes a barrier diaphragm configured to move in response to pressure and an overload diaphragm configured to limit movement of the barrier diaphragm. The overload diaphragm is also configured to exert a preload force against the sensor body. The overload diaphragm of each pressure input may include multiple convolutions. Bases of the convolutions may be configured to provide the preload force, and tops of the convolutions may be separated from the sensor body by gaps. Tops of the convolutions that are non-adjacent may be configured to provide the preload force, and tops of the convolutions between the non-adjacent convolutions may be separated from the sensor body by gaps.

A sensor module includes a sensor module body, a sensing element within the sensor module body that senses a characteristic of an environment, a breathing element within the sensor module body that allows the sensing element to access the environment, electronics within the sensor module body coupled to the sensing element, and wherein the sensor module body forms a wall of a flame path.

Example systems, apparatuses and methods are disclosed for detecting a gas leak. An example system comprises a sensor sub-module, a processor sub-module, and a barrier structure configured to restrict flame spread between the sensor sub-module and the processor sub-module. The barrier structure comprises a first housing part, a second housing part, and a printed circuit board disposed in a cavity structure formed by the first housing part and the second housing part. The barrier structure further comprises a first electrical connector configured to provide a first electrical connection to the sensor sub-module. The barrier structure further comprises a second electrical connector configured to provide a second electrical connection to the processor sub-module.

The invention relates to a pressure relief device (1) for a housing (2) which is protected against explosions, in particular is compression-proof and has a wall connecting piece (3) which can be at least partially inserted into a housing opening (4) of a housing wall (6) by its insertion connecting piece section (5), which can be in particular detachably fixed from an inner side of the housing and rests from the outside on an opening edge (8) of the housing opening (4) in its inserted and fixed position with a radially outwardly projecting support flange (7), wherein the insertion connecting piece section (5) furthermore comprises a projecting connecting piece section (9) which is opposite the insertion connecting piece section relative to the support flange (7) and comprises a longitudinal conduit (10) running through the wall connecting piece (3) into which conduit a flame-blocking body (11) is replaceably inserted, wherein a pressure nut (13) which loads the flame blocking body (11) with pressure in its insertion position and with a pressure edge (14) projecting radially inward at least in sections can be screwed onto a free end section (12) of the projecting connecting piece section (9), and wherein the pressure edge (14) contacts an outer viewing side of the flame blocking body (11).

An apparatus includes a sensor body and a sensor configured to measure pressure. The apparatus also includes at least one pressure input in or on the sensor body, where the at least one pressure input is configured to provide at least one input pressure to the sensor. The apparatus further includes multiple fluid passages configured to convey the at least one input pressure from the at least one pressure input to the sensor using a fill fluid. The multiple fluid passages are configured to both (i) transport the fill fluid and (ii) absorb thermal energy in a flame created by the sensor before the flame exits the sensor body. The fluid passages can include long and narrow straight passages, long and narrow curved or helical passages, and turns or bends. The fluid passages can have small cross-sections relative to their lengths.

An apparatus includes a header containing a sensor configured to measure pressure and a sensor body connected to the header, where the sensor body and the header form a pressure vessel configured to receive an input pressure. The header is connected to the sensor body such that the input pressure received on an inner surface of the header is substantially equal to the input pressure received on an outer surface of the header. A lowest connection point of the header to the sensor body may be located at or above a highest point at which the input pressure extends into the header. A lower portion of the header may be unconnected to the sensor body and extend into an interior volume of the sensor body. The header may include a vent configured to expose the sensor to atmospheric pressure or a lower-pressure input pressure.