A system includes a flow sensor contained within a flow sensor housing, a base, and a seal. The base houses a controller that generates at least one operation modification signal, and the flow sensor is separable from and mountable onto the base. A bottom surface of the flow sensor housing includes the seal. The seal forms a liquid-tight engagement between the flow sensor housing and the base when the flow sensor is mounted onto the base.

A transducer system. The system comprises a transducer and circuitry for applying an excitation waveform to excite the transducer during an excitation period. The circuitry for applying has: (i) circuitry for applying a first waveform at a first frequency; and (ii) circuitry for applying a second waveform at a second frequency differing from the first frequency.

A transducer system. The system comprises a transducer and circuitry for applying an excitation waveform to excite the transducer during an excitation period. The circuitry for applying has: (i) circuitry for applying a first waveform at a first frequency; and (ii) circuitry for applying a second waveform at a second frequency differing from the first frequency.

The present application discloses a flow speed detection circuit and a related chip and flow meter. The flow speed detection circuit includes: a transmitter, configured to provide a front signal and a main signal to a first transducer, wherein the first transducer transforms the front signal and the main signal into a transduced signal to a second transducer, the second transducer transforms the transduced signal into a receiving front signal and a receiving main signal to a receiver; and the receiver includes: a front signal detection circuit, configured to enable the main signal processing circuit after the receiving front signal; and the main signal processing circuit, configured to determine the flow speed based on the receiving main signal after being enabled.

An HVAC flow measurement system (1) comprises an ultrasonic flowmeter (10) for measuring a flow of gas through a channel (2). The ultrasonic flowmeter (10) comprises ultrasonic transducers (11, 12) arranged at a distance from each other in flow direction (f). The ultrasonic transducers (11, 12) are configured to emit an ultrasonic pulse into the channel (2) and to receive an ultrasonic pulse in the channel (2). The flow measurement system (1) further comprises a processor (100) connected to the two ultrasonic transducers (11, 11a, 11b, 12, 12a, 12b) and configured to determine and store transit times of ultrasonic pulses propagating in and against flow direction (f) along more than one path (R1, R2) in the channel (2), and to determine the flow of gas using the transit times.

An HVAC flow measurement system (1) comprises an ultrasonic flowmeter (10) for measuring a flow of gas through a channel (2). The ultrasonic flowmeter (10) comprises ultrasonic transducers (11, 12) arranged at a distance from each other in flow direction (f). The ultrasonic transducers (11, 12) are configured to emit an ultrasonic pulse into the channel (2) and to receive an ultrasonic pulse in the channel (2). The flow measurement system (1) further comprises a processor (100) connected to the two ultrasonic transducers (11, 11a, 11b, 12, 12a, 12b) and configured to determine and store transit times of ultrasonic pulses propagating in and against flow direction (f) along more than one path (R1, R2) in the channel (2), and to determine the flow of gas using the transit times.

A fluid sensor for monitoring a flow tube of a fluid flow system is provided. The fluid sensor comprises a housing to hold a portion of the flow tube, and the housing defines a first cavity, a second cavity, a first fixture and a second fixture. The fluid sensor comprises an ultrasonic transducer disposed within the first cavity and a force sensor disposed within the second cavity. The ultrasonic transducer has an emitting face to emit ultrasonic signals, and the emitting face is configured to face the portion of the flow tube. The first fixture extends along a boundary of the first cavity and the second fixture extends along a boundary of the second cavity.

A system, method, and apparatus for reducing ringing effects associated with a transducer comprises a transducer body, a transducer cap, a piezoelectric element formed in the cap, and a damping material formed around the piezoelectric element wherein the damping material suppresses a ringing effect associated with the transducer, while an O-ring is used together with damping material to support high pressure applications up to 230 bars.

A system, method, and apparatus for reducing ringing effects associated with a transducer comprises a transducer body, a transducer cap, a piezoelectric element formed in the cap, and a damping material formed around the piezoelectric element wherein the damping material suppresses a ringing effect associated with the transducer, while an O-ring is used together with damping material to support high pressure applications up to 230 bars.

A system includes a flow sensor contained within a flow sensor housing, a base, and a seal. The base houses a controller that generates at least one operation modification signal, and the flow sensor is separable from and mountable onto the base. A bottom surface of the flow sensor housing includes the seal. The seal forms a liquid-tight engagement between the flow sensor housing and the base when the flow sensor is mounted onto the base.