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.

A pressure change measuring apparatus and a pressure change measuring method are capable of detecting a change in pressure to be measured with respect to a time axis with high accuracy. The pressure change measuring apparatus includes a reference value setting unit that generates a reference value signal based on an output signal of a differential pressure measuring cantilever under a predetermined state and outputs the reference value signal. An arithmetic processing unit calculates the pressure change in the pressure to be measured based on the output signal, the reference value signal, a volume of a cavity, and a flowing quantity of a pressure transmission medium flowing into and out of the cavity for every unit of a predetermined time period.

A micropump with a deformable membrane, including: a first chamber, one wall of which includes a first deformable membrane portion and an actuator of the first membrane portion; a second chamber including a second deformable membrane portion and a third chamber, including a third deformable membrane portion, the second chamber and the third chamber being connected together through a first channel, at least one of the second and third chambers being connected through a second channel to the first chamber; each of the second chamber and third chamber including a mechanism forming a detection gauge, but not including an activation mechanism.

Included are mass flow controllers and methods of use. An example mass flow controller comprises a flow pathway through the mass flow controller; the flow pathway comprising a first cavity and a second cavity. The mass flow controller further comprises a laminar flow element. The mass flow controller additionally comprises a combination absolute and differential pressure transducer assembly comprising: a third cavity in fluid communication with the first cavity, an absolute pressure transducer exposed to absolute pressure in the third cavity, and a differential pressure transducer exposed to differential pressure between the third cavity and the second cavity. The mass flow controller also comprises a flow control valve assembly downstream of the laminar flow element and the combination absolute and differential pressure transducer assembly.

In order to solve a problem occurring in a capacitance type pressure sensor adapted to measure absolute pressure, and thereby reduce error, a pressure type flowmeter includes a fluid resistance part in a flow path through which fluid flows and measures a flow rate by detecting the upstream and downstream pressures of the fluid resistance part. Respective pressure sensors for detecting the upstream and downstream pressures are configured to be gauge pressure sensors. Each of the gauge pressure sensors is a capacitance type pressure sensor adapted to measure gauge pressure by detecting a change in the capacitance between a diaphragm displaceable by pressure and a fixed electrode and has a main body part that supports the fixed electrode and the diaphragm and forms a space between them. Further, the internal space is adapted to communicatively connect to the outside through a communicative connection part.

An airflow sensor for a heat sink has a first portion having a first electrical point of contact, a second portion have a second electrical point of contact, and a deformable portion made of an electroactive material electrically coupled to the first and second portions. The deformable portion has first electrical properties measured between the first and second electrical points of contact when there is no airflow and the deformable portion is in a first position, and has second electrical properties different than the first electrical properties when a source of airflow blows air against the deformable portion, thereby causing the deformable portion to extend to a second position farther away from the source of airflow than the first position. The airflow sensor can be incorporated into a heat sink for an electronic component.

The present invention discloses a fiber optical Fabry-Perot flow test device with local bending diversion structure, comprising an inlet flange, a test tube and an outlet flange, wherein a fiber optical Fabry-Perot pressure sensor at high-pressure-side is connected to a first circulator which is connected to a first light source and a first optical signal demodulation system, and the first optical signal demodulation system being connected to a first linear array CCD camera; and, a fiber optical Fabry-Perot pressure sensor at low-pressure-side is connected to a second circulator which is connected to a second light source and a second optical signal demodulation system, the second optical signal demodulation system being connected to a second linear array CCD camera, both the first linear array CCD camera and the second linear array CCD camera being connected to a signal conditioning and acquisition circuit which is connected to a data processing unit. A method of the present invention is as follows: a high pressure signal and a low pressure signal change the length of a Fabry-Perot cavity, and a high-pressure-side electrical signal and a low-pressure-side electrical signal are transmitted to a data processing unit, and a fluid flow is calculated. The present invention solves the cross-sensitivity problem of the temperature on pressure-type flow tests, and improves the accuracy of flow tests.

A balancing valve for adjusting the flow rate of a fluid flowing inside a pipe from upstream to downstream in a longitudinal direction of flow. The balancing valve includes: a check valve and a tubular element simulating a Venturi tube, said valve and element being coaxially connected, respectively, from upstream to downstream in the longitudinal direction of flow of the fluid; a device for detecting the difference in pressure which occurs inside the valve; a valve for adjusting the flow rate of the fluid which flows inside the pipe; wherein: the detection device is arranged between the inside of a first upstream chamber of the check valve and the inside of a central cylindrical portion of the tubular element.

A connector for coupling a single-use container to a measurement instrument includes a connector region. The connector includes a deflectable diaphragm sealed to the connector region and configured to contact a media sample.

Disc pump systems and methods relate to a disc pump system that includes a first disc pump having a first actuator and a second disc pump having a second actuator. The systems and methods utilize sensors to measure the displacements of the actuators and a processor to determine the pressure differential across each actuator as a function of the measured displacements of the actuators. The disc pumps are fluidly coupled by a known restriction and the processor determines the flow rate of the disc pump system based on the determined pressure differentials across each actuator and the characteristics of the known restriction.