Embodiments described herein relate to a flow meter assembly. The inline flow meter assembly includes a housing, an elongated flow member, and a piston. The housing includes a fluid passage. The elongated flow member has a shaft portion and an opposite fluid flow portion. The fluid flow portion has an outer peripheral surface. The shaft portion is coupled to the housing. The piston has a plate. The plate has a plate orifice. The piston and the plate move axially between a no flow position where the outer peripheral surface of the fluid flow portion is engaged with the plate orifice to prevent a fluid flow and a full flow position where the outer peripheral surface of the fluid flow portion is disengaged with the plate orifice such that the fluid flow enters the plate orifice and passes through the fluid passage in the axial direction of movement of the piston.

A monitor device that is configured for use on flow controls and like industrial devices. The embodiments may include a resonator that is sensitive to vibrations on the flow control. The resonator may generate a non-electrical signal, like pressure waves. This non-electrical signal can transit a conduit to a sensor that can convert the pressure waves into an electrical signal. On valve assemblies, a controller can process the electrical signal to detect potential health or maintenance issues. The controller may, in turn, generate an alert to prompt operators to perform maintenance on the flow control.

Flow sensors are provided that can monitor flow conditions. The flow sensor includes a gauge that provides a first level of information about flow through the sensor, and an indicator associated with the gauge that can provided a second level of information about flow through the sensor. The indicator might be in the form of a dial that can rotate about the gauge and might include a locked position for monitoring flow and an unlocked position to rotate the dial about the gauge to reposition the dial. Vanes in the flow sensor remove turbulence in the flow sensor to settle any noise that would otherwise register in the first level of information about flow through the sensor. The plunger with a rounded upstream face also helps to settle any such noise.

Methods and apparatuses for indicating the presence of a threshold directional differential pressure between separated adjacent spaces. A conduit contains at least one movable element that indicates whether the pressure difference between the two spaces is at least as high as a threshold pressure difference. The apparatus is adjustable to have different threshold set points by adjusting the pivot arm inclination relative to a horizontal plane.

Embodiments described herein relate to a flow meter assembly. The inline flow meter assembly includes a housing, an elongated flow member, and a piston. The housing includes a fluid passage. The elongated flow member has a shaft portion and an opposite fluid flow portion. The fluid flow portion has an outer peripheral surface. The shaft portion is coupled to the housing. The piston has a plate. The plate has a plate orifice. The piston and the plate move axially between a no flow position where the outer peripheral surface of the fluid flow portion is engaged with the plate orifice to prevent a fluid flow and a full flow position where the outer peripheral surface of the fluid flow portion is disengaged with the plate orifice such that the fluid flow enters the plate orifice and passes through the fluid passage in the axial direction of movement of the piston.

Methods and apparatuses for indicating the presence of a threshold directional differential pressure between separated adjacent spaces. A conduit contains at least one movable element that indicates whether the pressure difference between the two spaces is at least as high as a threshold pressure difference. The apparatus is adjustable to have different threshold set points by adjusting the pivot arm inclination relative to a horizontal plane.

A turbulator adapted to be mounted to or inserted in an inlet portion of a flow meter for a ventilator is disclosed. The turbulator is adapted to create a turbulent gas flow in the inlet portion downstream of the turbulator upon passage of a gas flow therethrough. A flow meter for a ventilator is provided. The flow meter may comprise such turbulator. The turbulator may be arranged in the inlet portion of the flow meter. A membrane for a ventilator flow meter is provided, as well as a flow meter comprising the membrane. A flow meter comprising a turbulator and a membrane is disclosed.

A self-draining transmitter mount head includes a head body with a transmitter process coupling port in the head body, an impulse port in the head body, and an impulse passage coupled to the impulse port. An impulse drain passage is coupled between the pressure transmitter port and the impulse passage. The impulse drain passage is positioned at an angle to the impulse passage, and relative to a head installation angle that positions the impulse drain passage to drain away from the transmitter process coupling port through a range of head installation angles.

An optofluidic flow meter to determine a rate of fluid flow in a flow member includes: the flow member; a primary fluid conduit disposed in the flow member and that receives a fluid; a secondary fluid conduit disposed in the flow member; and a fiber optic comprising a fiber Bragg grating interposed between a first flow region of the primary fluid conduit and a second flow region of the secondary fluid conduit and that: physically distorts relative to a pressure differential between the primary fluid conduit and the secondary fluid conduit; and produces a shift in a Bragg wavelength in response to a physical distortion due to the pressure differential.

A self-draining transmitter mount head includes a head body with a transmitter process coupling port in the head body, an impulse port in the head body, and an impulse passage coupled to the impulse port. An impulse drain passage is coupled between the pressure transmitter port and the impulse passage. The impulse drain passage is positioned at an angle to the impulse passage, and relative to a head installation angle that positions the impulse drain passage to drain away from the transmitter process coupling port through a range of head installation angles.