Differential pressure airflow sensor devices are disclosed. Disclosed are sensor devices for mounting on a fixed resistance having a low-pressure probe for extending through the fixed resistance from a housing and a high-pressure inlet to the housing. Disclosed are sensor devices having a plurality of pressure transducers.

A physical quantity measuring device detects a physical quantity of gas flowing in a flow passage. The physical quantity measuring device includes a sensor element that outputs a detection signal according to the physical quantity, a case that is provided to the flow passage and houses the sensor element, and a protrusion that protrudes from a passage wall surface facing the flow passage. The case includes a measurement chamber that houses the sensor element and an inflow port that is configured to cause a part of gas flowing in the flow passage to flow into the measurement chamber therethrough. The protrusion is configured to guide gas flowing along the passage wall surface toward the inflow port.

A fluid governing system including a fluid inlet and fluid inlet port coupleable to an upstream pipe segment; a fluid outlet and a fluid outlet port coupleable to a downstream pipe segment; a flow unit; a metering inlet path in flow communication with the fluid inlet; a metering outlet path in flow communication with the fluid outlet, the metering inlet path is in flow communication with the metering outlet path through the flow unit which is articulable between the metering inlet path and the metering outlet path; a pressure responsive sealing diaphragm for selective sealing a metering inlet port; an inlet chamber disposed at a face of the sealing diaphragm, the inlet chamber in flow communication with the fluid inlet; a control chamber disposed at an opposite face of the sealing diaphragm; and a control fluid duct extending between the inlet chamber and the control chamber.

A flow meter has fluid flow through a measurement path in a measuring tube with a main channel and at least one secondary channel. A signal input device introduces a measurement input signal into the fluid and a signal detection device detects the measurement input signal and/or a response signal induced by the measurement input signal. For a predetermined fluid, the main and secondary channels with a first total throughput of the fluid per unit time and with a second total throughput of the fluid per unit time, which is greater than the first total throughput of the fluid per unit time. The ratio of the throughput through all the secondary channels to the throughput through the main channel is greater in the second total throughput than in the first total throughput of the fluid per unit time.

Differential pressure airflow sensor devices are disclosed. Disclosed are sensor devices for mounting on a fixed resistance having a low-pressure probe for extending through the fixed resistance from a housing and a high-pressure inlet to the housing. Disclosed are sensor devices having a plurality of pressure transducers.

A minimal-amount powder metering device (1) for pharmaceutical or chemical applications, for metering powder volumes of less than 1 cm.sup.3, comprising a metering chamber (3) which is delimited by a surrounding wall (9) and which can be connected to a vacuum source (28) for suctioning powder in order to fill the metering chamber (3) with powder to be metered, filter means for retaining powder in the metering chamber (3) during a suctioning process being associated with the metering chamber (3), including the filter means are formed by the surrounding wall (9) and including at least one suction opening (12, 13) which serves to retain the powder in the metering chamber (3) and through which a vacuum can be applied to the metering chamber (3) is formed in the surrounding wall (9).

A filter assembly includes a conditioning device that conditions a flow of air upstream of a mass air flow sensor. The filter assembly includes a support frame. The filter assembly further includes a filter media coupled to the support frame, the filter media having a dirty side configured to receive a stream of air and a clean side configured to output a stream of air that has been filtered through the filter media. The filter assembly includes a conditioning device coupled to the support frame, the conditioning device positioned in a downstream direction from the clean side of the filter media with respect to the stream of air, the conditioning device offset from the clean side of the filter media by a separation distance.

A filter assembly includes a conditioning device that conditions a flow of air upstream of a mass air flow sensor. The filter assembly includes a support frame. The filter assembly further includes a filter media coupled to the support frame, the filter media having a dirty side configured to receive a stream of air and a clean side configured to output a stream of air that has been filtered through the filter media. The filter assembly includes a conditioning device coupled to the support frame, the conditioning device positioned in a downstream direction from the clean side of the filter media with respect to the stream of air, the conditioning device offset from the clean side of the filter media by a separation distance.

A self-excited wet gas flow measuring device, including a housing (1), the housing (1) is provided with a wet gas inlet (21), a dry gas outlet (23) and a liquid outlet (25); the middle of the housing (1) is mounted with a mist catching filter screen to divide a hollow cavity inside the housing (1) into a dry gas region (33) and a wet gas region (34); the wet gas inlet (21) and the liquid outlet (25) are both disposed in the wet gas region (34), and the dry gas outlet (23) is disposed in the dry gas region (33); a gas flowmeter (41) for metering the transmitted dry gas is provided at the dry gas outlet (23), a control device (51) is provided within the wet gas region (34), and a detection counting device (52) is provided at the liquid outlet (25).

A method for carrying out an integrity test on a filter element includes filling a fluid into at least one vessel (1), in which a filter element (F) to be tested is arranged. The method proceeds by setting the pressure of the fluid in the vessel (1) to a predetermined test pressure, and maintaining the test pressure in the vessel (1) with controlled replenishment of fluid into the vessel (1) and/or a controlled change in internal volume of the vessel (1). The method continues by determining an integrity characteristic variable for the filter element (F) in a manner dependent on the controlled replenishment of fluid into the vessel (1) and/or dependent on the controlled change in internal volume of the vessel (1) before attaining a substantially continuous volume flow of fluid for maintaining the specific test pressure in the vessel (1).