A flow rate control device 100 includes a control valve 6 provided in a flow path 1, a flow rate measurement unit 2, 3 for measuring fluid flow rate controlled by the control valve 6, and a controller 7. The controller 7 is configured so as to control the opening/closing operation of the control valve 6 to match the measurement integral flow rate based on the signal outputted from the flow rate measurement unit (Vn+Vd) to the target integral flow rate Vs.

Disclosed herein are systems and methods for measuring and controlling a flow rate through a particle counter or active air sampler. As disclosed herein, a fluid flows through a venturi tube and an orifice in the system at a predetermine velocity. A pressure differential between an inlet of the instrument and a throat section of the venturi tube is measured. The flow rate through the system can be determined based on the pressure differential and an intensive property of the fluid. An alarm can be activated when the flow rate is outside of a flow rate range.

A gas flow control system for delivering a plurality of gas flows. The gas flow control system has a gas flow path extending from a gas inlet to first and second gas outlets. First and second flow restrictors are operably coupled to the gas flow path. First and second valves are operably coupled to the gas flow path such that when both first and second valves are in a fully open state, flows of gas from the first and second gas outlets are split according to the impedances of the first and second flow restrictors.

Method for determining a flow rate of a drilling mud in a subsoil drilling system which includes a main duct and a bypass conduit. The bypass conduit has a narrowed section. The method includes: feeding the bypass conduit with drilling mud, coming from a drilling well formed by the system and carrying drilling cuttings; coupling, to the narrowed section, a differential pressure sensor generating a first signal representative of a difference between a first pressure detected upstream or downstream of the narrowed section and a second pressure detected in the narrowed section; coupling, to the bypass conduit, a thermal dispersion sensor generating a second signal representative of a velocity of the mud; selecting, as a mud flow rate value, one of a first value calculated based on the first signal and on a density value of the mud, and a second value based on the second signal.

Continuous microfluidic dilatometry devices and methods are provided for activity monitoring with ultra-high sensitivity. Corner flow in capillary channels is used to detect the resistance change in microfluidic circuits filled with ionic 5 liquids. The conversion of mechanical input (e.g. strain) to an intermediary domain, namely liquid displacement, allows a large enhancement in sensor performance. Embodiments are suitable for tracking skin deformations that occur as a result of human movements.

A drop test measuring system and method of use is described. Embodiments of the drop test measuring system can include, but is not limited to, a control module, a liquid level measuring device, and a remotely located smart device. The liquid level measuring device can be implemented to take measurements that can allow a smart device to calculate a liquid level based on the measurements in addition to other known parameters. Typically, the drop test measuring system can be implemented in a water treatment facility implementing a filter medium.

Embodiments include a multiphase flowmeter system (300). The multiphase flowmeter system (300) may include a first inline flow conditioner (310) for reducing a slip velocity between a liquid phase and a gas phase of a multiphase fluid, a flowmeter for measuring a flow rate of the multiphase fluid, a second inline flow conditioner (350) for separating the liquid phase and the gas phase of the multiphase fluid, a non-radioactive sensor system for measuring one or more of a gas void fraction of the multiphase fluid and a water-cut of the multiphase fluid, and a processor (480) for computing one or more flow rates of the multiphase fluid. Embodiments further include methods of measuring one or more flow rates of a multiphase fluid and other related methods, apparatuses, devices, and systems.

Described herein are devices, systems and methods for monitoring the use of a nebulized medication, such as can be administered using a nebulizer. These can be used for monitoring a patient undergoing treatment for COPD and improve compliance to the recommended therapy. Monitored parameters include flow, humidity and acceleration and provide data as to the quantity and quality of nebulizer use.

An intelligent self-balancing downstream device that can obtain accurate flow measurements (e.g., flow of a liquid or gas through a tube) that can perform the self-balancing in situ and during operation to satisfy a set point and without k factors or the use of TAB balancers. The downstream device may be controllable by a single software system or network. The downstream device can operate in a single zone or be coupled with multiple like apparatuses. It has a high turndown ratio and self-balances, which can allow for continuous commissioning with built-in fault diagnostic systems. A fluid metering device can include control systems that operate progressively based on unique actuation mechanisms and/or algorithms that allow for precise flow control and feedback to self-balance and commission the system.

A fluid distribution apparatus that can serve as a fluid metering device that is operable on a single platform by building automation systems. The building automation system may be controllable by a single software system or network accessible locally on site or remotely off site. The fluid distribution apparatus can operate independently or coupled with multiple like apparatuses for system operation. It is a high turndown, self-balancing system which allows for continuous commissioning with built-in fault diagnostic systems and that may be used as a supply system, exhaust system, or a combination thereof. The fluid distribution apparatus includes fluid metering devices that operate progressively based on unique actuation mechanisms and/or algorithms that allow for precise flow control and feedback to self-balance and commission the system.