A method for determining mass flow according to the differential pressure method on an internal combustion engine, includes calculating a mass flow signal by using sensors of a mass flow meter to measure a differential pressure, an absolute pressure and a temperature of the mass flow. The mass flow signal is filtered by an evaluation unit of the mass flow meter and the filtered mass flow signal is sent to an engine control. The filter parameters are matched to a measurement situation by the evaluation unit. In a first measurement situation, the filter parameters are set on the basis of an analysis of pulsations of the current measured values and in a second measurement situation, the filter parameters are set on the basis of status data of the internal combustion engine transmitted by the engine control unit. A mass flow meter and a probe are also provided.

A method for determining mass flow according to the differential pressure method on an internal combustion engine, includes calculating a mass flow signal by using sensors of a mass flow meter to measure a differential pressure, an absolute pressure and a temperature of the mass flow. The mass flow signal is filtered by an evaluation unit of the mass flow meter and the filtered mass flow signal is sent to an engine control. The filter parameters are matched to a measurement situation by the evaluation unit. In a first measurement situation, the filter parameters are set on the basis of an analysis of pulsations of the current measured values and in a second measurement situation, the filter parameters are set on the basis of status data of the internal combustion engine transmitted by the engine control unit. A mass flow meter and a probe are also provided.

A carbonated water dispenser comprises a carbonator with a water inlet and a carbonated water outlet. A backflow preventer module is fluidically coupled to the water inlet and comprises a check valve and a thermal mass flow meter. The thermal mass flow meter is configured to communicate a first signal based on a measured amount of heat transferred from a heater to a temperature sensor by a flow of a fluid through the backflow preventer module. A shut-off valve is fluidically coupled between the carbonated water outlet and a nozzle. The shut-off valve is configured to allow or prevent fluid flow from the carbonated water outlet to the nozzle base on a control signal. A controller is configured to detect a backflow condition based on the first signal and generate the control signal to configure the shut-off valve to prevent dispensing carbonated water upon detection of the backflow condition.

Disclosed herein are embodiments of a mass flow control apparatus, systems incorporating the same, and methods using the same. In one embodiment, a mass flow control apparatus comprises a flow modulating valve configured to modulate gas flow in a gas flow channel, a sensor device, such as a micro-electromechanical (MEMS) device, configured to generate a signal responsive to a condition of the gas flow, and a processing device operatively coupled to the flow modulating valve and the sensor device to control the flow modulating valve based on a signal received from the sensor device.

Disclosed herein are embodiments of a mass flow control apparatus, systems incorporating the same, and methods using the same. In one embodiment, a mass flow control apparatus comprises a flow modulating valve configured to modulate gas flow in a gas flow channel, a sensor device, such as a micro-electromechanical (MEMS) device, configured to generate a signal responsive to a condition of the gas flow, and a processing device operatively coupled to the flow modulating valve and the sensor device to control the flow modulating valve based on a signal received from the sensor device.

A flow meter for a fluid with a pulsating flow includes a piezo transducer for receiving and converting fluid pulses into electrical pulses, a AC/DC converter circuit for cumulatively storing the pulse energies of the electrical pulses in an energy store, a counter for counting the electrical pulses during a time interval, an evaluation device for determining a pulse parameter indicative of the flow rate of at least one of the electrical pulses and for determining a flow value based on the electrical pulses counted within the time interval and the determined pulse parameter, a communication device for the preferably wireless transmission of the determined flow value and a power supply device for the exclusive power supply of the flow meter with the energy stored in the energy store.

A gas delivery system and method are provided that include a therapeutic gas delivery device, and a high-frequency ventilator delivering a breathing gas to a respiratory circuit. The therapeutic gas delivery system also includes a flow sensor assembly having a single interior chamber. The flow sensor assembly includes a flow sensor connected with the therapeutic gas delivery device and configured to measure a flow rate of the breathing gas. The flow sensor has a sensor gas inlet and a sensor gas outlet. The flow sensor assembly further includes a one-way flow valve disposed downstream of the sensor gas outlet. The one-way flow valve includes a valve gas inlet and a valve gas outlet. Inner diameters of the valve gas inlet and the valve gas outlet are greater than or equal to an inner diameter of at least one of the sensor gas inlet and the sensor gas outlet.

A gas safety device includes flow path, shutoff valve that shuts off flow path, flow rate measurement unit that measures a flow rate of gas, gas-side absolute pressure sensor that measures absolute pressure of the gas, atmosphere-side absolute pressure sensor that measures absolute pressure of atmospheric pressure, and pressure value transition detector that detects a transition state of the absolute pressure measured by gas-side absolute pressure sensor. Further provided are sensor drive controller that controls driving of atmosphere-side absolute pressure sensor in accordance with a value of pressure transition in pressure value transition detector, and gas pressure determination unit that calculates gas supply pressure from a difference between pressure values measured when the two sensors are driven. Control circuit is further provided to shut off flow path with shutoff valve when determining anomaly from a flow rate measured by flow rate measurement unit and gas supply pressure calculated by gas pressure determination unit.

A dripping detection apparatus includes a cylindrical drip cylinder into which a nozzle is inserted from an upper side and that receives inside a liquid droplet dripping from a lower end of the nozzle, and a photo interrupter that has equal to or more than one light emitting element emitting light and equal to or more than two light receiving elements receiving the light, wherein the equal to or more than one light emitting element and the equal to or more than two light receiving elements are arranged at opposing or substantially opposing positions with the drip cylinder interposed between the elements and equal to or more than two light paths connecting the equal to or more than one light emitting element to the equal to or more than two light receiving elements are located at a lower side relative to the lower end of the nozzle.

A dripping detection apparatus includes a cylindrical drip cylinder into which a nozzle is inserted from an upper side and that receives inside a liquid droplet dripping from a lower end of the nozzle, and a photo interrupter that has equal to or more than one light emitting element emitting light and equal to or more than two light receiving elements receiving the light, wherein the equal to or more than one light emitting element and the equal to or more than two light receiving elements are arranged at opposing or substantially opposing positions with the drip cylinder interposed between the elements and equal to or more than two light paths connecting the equal to or more than one light emitting element to the equal to or more than two light receiving elements are located at a lower side relative to the lower end of the nozzle.