Methods and apparatuses for indicating the presence of a directional differential pressure between separated adjacent spaces are provided. A differential pressure set point indicator may be configured to correlate multiple potential angles of inclination of an elongated conduit to respective threshold differential pressures between two spaces which generate net flow of fluid sufficient to cause a lightweight ball to move from one region of the conduit to an opposing region. The elongated conduit may be adjustable in length so as to accommodate installation of the device into walls of varying thickness. The device may include a sound attenuator that reduces noise upon impact of the ball with either end of the conduit. The device may also include a sealing material that is flexible yet firm enough to provide both a seal with the exterior surface of the conduit and support for the conduit when oriented in a tilted configuration.

The present disclosure relates to an air-speed sensor, system and monitoring process This sensor generally comprise a sensor casing having a leading surface and distinctly oriented input ports. Each input port can independently capture respective air pressure and connects to a pressure sensor that independently measures that air pressure digital processor connects to each pressure sensor and can digitally compute pressure ratios between the input ports and compare these ratios against designated pressure ratios corresponding to designated incident airspeed angles of incidence to output an airspeed incident angle and airspeed accordingly.

Methods and apparatuses for indicating the presence of a directional differential pressure between separated adjacent spaces are provided. A differential pressure set point indicator may be configured to correlate multiple potential angles of inclination of an elongated conduit to respective threshold differential pressures between two spaces which generate net flow of fluid sufficient to cause a lightweight ball to move from one region of the conduit to an opposing region. The elongated conduit may be adjustable in length so as to accommodate installation of the device into walls of varying thickness. The device may include a sound attenuator that reduces noise upon impact of the ball with either end of the conduit. The device may also include a sealing material that is flexible yet firm enough to provide both a seal with the exterior surface of the conduit and support for the conduit when oriented in a tilted configuration.

A method for monitoring the dispensing of a drop by a device for dispensing a liquid product in the form of drops uses a detector for detecting a liquid product arranged near an orifice for dispensing drops, and a system for processing information provided by the detector. The processing system receives information corresponding to the series of steps: detecting the presence of liquid, wherein the detector detects the presence of liquid near the dispensing orifice, the detector configured such that detection of the presence of liquid is indicative of a drop in the course of being formed, in contact with the dispensing orifice, and detecting an absence of liquid, wherein the detector detects the absence of liquid near the dispensing orifice, and the processing system processes the series of information on detection of the presence and absence of liquid in order to provide information on the dispensing of a drop.

A monitoring device includes a cavity assembly with a plurality of cavities. Openings of the plurality of cavities are distributed about a flow-facing surface of the cavity assembly. A gas pressure sensor is disposed within each of the cavities, and is configured to measure an absolute pressure of a gas flow which flows past the monitoring device. Gas pressure measurements from the pressure sensors may be used to determine a flow speed and a flow direction of the gas flow. More specifically, a mapping may be used to map the logarithm of the difference between the maximum and minimum pressures to a flow speed. Further, a lookup table may be used to map a pattern of pressure measurements to a flow direction.

Methods and apparatuses for indicating the presence of a directional differential pressure between separated adjacent spaces are provided. At least one movable element may be movable within an inclined conduit from a first vertically lower region to a second vertically higher region in response to a differential pressure between a first space and a second space separated by a barrier. The inclination of the conduit may be adjustable along a plane transverse to the barrier.

Methods and apparatuses for indicating the presence of a directional differential pressure between separated adjacent spaces are provided. A differential pressure set point indicator with integral calibration sensing the earth's gravitational horizontal or vertical planes may be configured to correlate multiple potential angles of inclination of a conduit located on one side of a wall to respective threshold differential pressures between two spaces which generate net flow of fluid sufficient to cause a lightweight ball to move from one region of the conduit to an opposing region. The inclination of the conduit may be adjusted through a rotatable configuration similar to a turret-type arrangement.

Methods and apparatuses for indicating the presence of a directional differential pressure between separated adjacent spaces are provided. At least one movable element may be movable within an inclined conduit from a first vertically lower region to a second vertically higher region in response to a differential pressure between a first space and a second space separated by a barrier. The inclination of the conduit may be adjustable along a plane transverse to the barrier.