Abstract: A housing with an inner lining, made of an open-pore material, preferably covering at least two sides of the housing, for the reduction of internal explosion pressure. In addition, or alternatively, a molded body made of the open-pore material, for example a bonded fibrous material, may be arranged in the housing.

Abstract: A flame arrester comprising two part-bodies, which consist of different wire fabric layers and are connected to one another by an intermediate layer of particularly coarse-meshed wire fabric. The coarse-meshed wire fabric preferably consists of a thick wire. Both the wire diameter and the mesh width of this intermediate layer are preferably much greater than the mesh widths and wire diameters of the wires used for the part-bodies. The pressure relief body combines a high degree of mechanical stability with a great flame arresting capability and at the same time very low flow resistance.

Abstract: A housing arrangement comprising a housing an inner space for accommodating components capable of forming sources of ignition. The housing arrangement further comprises a partial housing arranged in or on the housing and the interior space. The interior space acts as a pressure relief volume. The interior space and the pressure relief volume are connected together via a passage in which a gas-permeable and flame-arresting arrangement is provided. This can be formed from a porous body, for instance, which is gas permeable and acts in a throttling and cooling manner on a gas flow passing through it.

Abstract: A pressure relief body sintered from a wire mesh and retained on an explosion-proof housing by welding. The corresponding welded seam has a fusion zone both on the pressure relief body and on the housing part and makes a mechanically robust and gas-tight joint between the two.

Abstract: An explosion-proof arrangement (20) having a bushing part (23) with a bushing opening (24) that defines a bushing surface (25) and a structural unit (29) arranged in the bushing opening (24). The structural unit (29) includes a deformable inner body (31) with at least one conductor channel (32) extending through in a longitudinal direction (L), and a plastically deformable connecting sleeve (30) surrounding the inner body (31). At least one conductor (21) is guided through its own associated conductor channel (32) in the inner body (31). A connecting portion (33) of the connecting sleeve (30) is plastically deformed so that it presses radially inwardly on the inner body (31) and deforms it in a radial direction (R). A first delimiting surface (35) is formed on an outer circumference of the plastically deformed connecting portion (33). The bushing surface (25) forms a second delimiting surface (36).

Abstract: A ventilation device for supplying air to a clean room having a passage duct (16) with a waste air inlet (13) for receiving waste air form the room and a supply air outlet (14) for discharging supply air (34) to the room. A speed controllable rotatable fan (49) is provided in the passage duct (16) for conveying air from a suction chamber (47) coupled to the waste air inlet (13) to a pressure chamber (48) coupled to the supply air outlet (14). An outside air duct (22) is provided for receiving outside air (27) which is emitted into the passage duct (16), and an exhaust air duct (28) is provided for receiving a part of the waste air (32) extracted from the room for exhaust to the outside. First and second air flow regulators (36, 37) are provided in the respective air ducts (22, 28), and a control unit (68) is provided for controlling operation of the air flow regulators (36, 37) and the rotational speed of the fan (49).

Abstract: A lifting hoist (10) having a drive train (14) containing a slip clutch arrangement (23) with a hysteresis clutch (26). The drive train (14) transfers torque, friction-free, in both forward and backward directions of movement between the motor (15) and a gearing (16). The hysteresis clutch (23) forms an unbranched torque transmission path between the motor (15) and the gearing (16). The hysteresis clutch (26) acts as a vibration damper, allows controlled emergency load lowering, and acts as a secure torque limiter in emergency malfunctions when lowering a load. It further can be used as a load indicator by reducing the load-lifting speed before the nominal load is reached or in the event of an overload.

Abstract: A housing (10) which has a first part (14) with a first wall (22) having an outer wall surface (28) and a second part (18) with a second wall (24) having an inner wall surface (30). The wall surfaces can have for example a cylindrical casing shape at least in some sections. Portions of the first wall (22) and the second wall (24) overlap in an overlap region (26). The first wall (22) and the second wall (24) are connected along the circumference of the wall surfaces (28, 30) by means of a rotational friction welding seam (32) arranged in the overlap region (26). The rotational friction welding seam (32) has a compact zone (48) with a first elastic modulus and a mixing zone (44) with a different second elastic modulus.

Abstract: A housing (10) which has a first part (14) with a first wall (22) having an outer wall surface (28) and a second part (18) with a second wall (24) having an inner wall surface (30). The wall surfaces can have for example a cylindrical casing shape at least in some sections. Portions of the first wall (22) and the second wall (24) overlap in an overlap region (26). The first wall (22) and the second wall (24) are connected along the circumference of the wall surfaces (28, 30) by means of a rotational friction welding seam (32) arranged in the overlap region (26). The rotational friction welding seam (32) has a compact zone (48) with a first elastic modulus and a mixing zone (44) with a different second elastic modulus.

Abstract: A plug-in device (10) for providing commands and/or signals comprising an attachment part (12), an adaptor (22), and at least one command or notification device (30). The device (10) includes a plug-in rotary coupling for connecting the adaptor and attachment part in response to relative rotational movement about an axial direction (A). For locking the coupling, a locking web (62) is provided for engagement and disengagement by a locking coupling web (88) in response to relative rotation of the adaptor (22) and attachment part (12). A catch lock further is provided that includes a catch (68) arranged on a plug-in appendage (42 and a counter catch (90, 92) that are engageable by relative rotation of the adapter (22) and the attachment part (12).

Abstract: A feedthrough device (10) for an explosion-proof housing constructed as a “flameproof enclosure” of the flame protection type. The feedthrough device (10) is arranged in a wall opening of the housing and forms a flameproof gap therein. A rigid component (11) is arranged through said gap to be displaced in its direction of extension relative to the wall. The feedthrough device (10) has a clamping body unit (20), a sleeve (21), a cap (22) and a thrust collar (23). The sleeve (21) and the cap (22) can be screwed together. Axial forces are transmitted between the clamping body unit (20) and the cap (22) via the thrust collar (23). The sleeve (21) exerts a radial clamping force on the clamping body unit (20), which is fully penetrated by a conduit (25) along a longitudinal axis (L), in which conduit a longitudinal section of a component (11) is arranged.

Abstract: An operating attachment (10) for operating a push button or switch, which includes a housing, (12) a handling part (11) having an actuator element (19) supported by said housing (12) for rotation in a direction of rotation (U), an operating element (26) displaceable parallel to a longitudinal axis (L) of the housing for operating a push button or switch, an operating drive (37) for transferring rotary movement of the actuator element (19) into a linear motion of the operating element (26) between an initial position (A) and an operating position (B), and a latching device (42) for latching the actuator element (19) in a latched position (R). The attachment apparatus (10) further includes at least one encoding element (48) moveable between a first encoding position (K1) that allows for rotation of the actuator (11) into the latched position (R) and a second encoding position (K2) which limits rotation of the actuator element (19) prior to reaching the latched position (R).

Abstract: A plug-in device (10) for providing commands and/or signals comprising an attachment part (12), an adaptor (22), and at least one command or notification device (30). The device (10) includes a plug-in rotary coupling for connecting the adaptor and attachment part in response to relative rotational movement about an axial direction (A). For locking the coupling, a locking web (62) is provided for engagement and disengagement by a locking coupling web (88) in response to relative rotation of the adaptor (22) and attachment part (12). A catch lock further is provided that includes a catch (68) arranged on a plug-in appendage (42 and a counter catch (90, 92) that are engageable by relative rotation of the adapter (22) and the attachment part (12).

Abstract: A circuit arrangement for enforcing an intrinsically safe situation in a hazardous zone features a first switching device that lies in the series arm and a second switching device that lies in the shunt arm. If a fault occurs that would violate the conditions of intrinsic safety, the first switching device is initially blocked and the second switching device is switched through with a time delay such that the output terminals are mutually short-circuited. In addition, a monitoring device is provided for monitoring the load conditions at the switching device arranged in the series arm.

Abstract: A power-supply includes a power-supply input. A transformer has a primary winding and a secondary winding separated galvanically from the primary winding. A controlled semiconductor switch has a control input in series circuit with the primary winding, which lies parallel to the power-supply input. A controllable control circuit for the semiconductor switch delivers a periodic control signal, which is controlled such that the output voltage on the secondary winding is kept at a desired value independent of the load, to the semiconductor switch. A voltage limiting circuit lies parallel to the input side of the primary winding. An output signal of the voltage limiting circuit acts on the switch state of the semiconductor switch to move the semiconductor switch to a stationary state, in which it generates no alternating current on the primary winding, when the voltage on the primary winding has exceeded a specified limiting value.

Abstract: A hermetically sealed and/or ignition protection housing is provided with heat bridges at discreet points. The heat bridges form mounting faces in the interior space of the housing and also on the outer side. Heat from the interior of the housing generated by an item on the interior mounting faces is dissipated outwardly at the corresponding points by means of the heat bridges.

Abstract: A hermetically sealed and/or ignition protection housing is provided with heat bridges at discreet points. The heat bridges form mounting faces in the interior space of the housing and also on the outer side. Heat from the interior of the housing generated by an item on the interior mounting faces is dissipated outwardly at the corresponding points by means of the heat bridges.

Abstract: A hand held configuration for coupling to a two wire process control loop for use in configuring and monitoring field units coupled to the two wire process control loop is provided which includes a power supply, and at least two power islands. The power islands are configured to electrically isolate electrical components in one power island from electrical components in another power island. Independent power connections are provided between each power island and the power supply.

Abstract: A circuit arrangement includes a current measuring or temperature measuring device, used for triggering a shunt device. Said shunt device produces a short-circuit, which directly leads to the blowing of a fuse. The arrangement is modular and allows the operation of several current measuring devices on a common shunt device. Said arrangement is specifically adapted to prevent a protection resistor from warming up to too high a surface temperature in the case of an error, because the current is flowing for too much time.

Abstract: An intrinsically safe field maintenance tool includes terminals selectably coupleable to a process communication loop having a process industry standard communication protocol. At least one media is configured to communicate in accordance with a process industry standard communication protocol. A battery pack connector is adapted to removably couple to an intrinsically safe removable battery pack and provide power to circuitry in intrinsically safe field maintenance tool. An intrinsically safe battery pack is also provided.