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 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 catalyst alarm system for resin/catalyst spray applications, the system having a first flow sensor that monitors whether a catalyst from a manifold is flowing for supply to a spay gun or other applicator at a specified minimum rate; a second flow sensor that detects if the catalyst is flowing out of a bypass conduit of the manifold, which indicates the catalyst is not being mixed with the resin; a third flow sensor that detects if the catalyst is flowing out of an over-pressure conduit of the manifold, which indicates that only a partial amount of the required catalyst is being mixed with the resin; and monitoring circuitry for providing alarm and/or control features based on activation combinations of the three flow sensors.

A catalyst alarm system for resin/catalyst spray applications, the system having a first flow sensor that monitors whether a catalyst from a manifold is flowing for supply to a spay gun or other applicator at a specified minimum rate; a second flow sensor that detects if the catalyst is flowing out of a bypass conduit of the manifold, which indicates the catalyst is not being mixed with the resin; a third flow sensor that detects if the catalyst is flowing out of an over-pressure conduit of the manifold, which indicates that only a partial amount of the required catalyst is being mixed with the resin; and monitoring circuitry for providing alarm and/or control features based on activation combinations of the three flow sensors.

A device for detecting a flow of a first gas in a conduit includes a gas jet interfaced to a side of the conduit. The gas jet emits a jet of gas aimed across the conduit. A fluid port is interfaced to a distal side of the conduit for receiving the jet of gas and a pressure-detecting device is interfaced to the fluid port. In absence of the flow of the first gas within the conduit, the gas jet enters the fluid port and the pressure-detecting device reports a first pressure. In presence of the flow of the gas within the conduit, the gas jet is deflected away from the main port by the flow of the first gas and the pressure-detecting device reports a second pressure, the second pressure being lower than the first pressure.

A sensor assembly for determining yield of grain harvested by a harvesting machine during harvesting operations. The sensor assembly includes a sensor housing, a displaceable sensor member and a displacement sensor. The sensor housing is mounted to the grain elevator housing above an upper sprocket of a conveyor disposed within the grain elevator housing. The sensor member is displaceably supported via the sensor housing within the elevator housing above the upper sprocket and along a direction of travel of the grain piles thrown by the conveyor flights rotating around the upper sprocket. The thrown grain piles produce a grain force on the sensor member causing a displacement of the sensor member in relation to the grain force. The displacement sensor generates a grain force signal corresponding to the displacement of the sensor member.

A sensor assembly for determining yield of grain harvested by a harvesting machine during harvesting operations. The sensor assembly includes a sensor housing, a displaceable sensor member and a displacement sensor. The sensor housing is mounted to the grain elevator housing above an upper sprocket of a conveyor disposed within the grain elevator housing. The sensor member is displaceably supported via the sensor housing within the elevator housing above the upper sprocket and along a direction of travel of the grain piles thrown by the conveyor flights rotating around the upper sprocket. The thrown grain piles produce a grain force on the sensor member causing a displacement of the sensor member in relation to the grain force. The displacement sensor generates a grain force signal corresponding to the displacement of the sensor member.

An open-vented instant water heater is configured so as to prevent damaging thereof in cases of incorrect installation. The water heater comprises a water canister with a heating element and has a normally open outlet pipe, wherein the outlet pipe is provided with a flow sensing device comprising: a one-way valve which allows water to flow from the canister toward the outer end of the outlet pipe while preventing a water flow in the opposite direction, and/or a water flow mechanism adapted to switch the heating element OFF whenever detecting in the outlet pipe either a water flow towards the canister, or absence of any water flow.

An open-vented instant water heater is configured so as to prevent damaging thereof in cases of incorrect installation. The water heater comprises a water canister with a heating element and has a normally open outlet pipe, wherein the outlet pipe is provided with a flow sensing device comprising: a one-way valve which allows water to flow from the canister toward the outer end of the outlet pipe while preventing a water flow in the opposite direction, and/or a water flow mechanism adapted to switch the heating element OFF whenever detecting in the outlet pipe either a water flow towards the canister, or absence of any water flow.

A catalyst alarm system for resin/catalyst spray applications, the system having a first flow sensor that monitors whether a catalyst from a manifold is flowing for supply to a spay gun or other applicator at a specified minimum rate; a second flow sensor that detects if the catalyst is flowing out of a bypass conduit of the manifold, which indicates the catalyst is not being mixed with the resin; a third flow sensor that detects if the catalyst is flowing out of an over-pressure conduit of the manifold, which indicates that only a partial amount of the required catalyst is being mixed with the resin; and monitoring circuitry for providing alarm and/or control features based on activation combinations of the three flow sensors.