Abstract: Differential pressure airflow sensor devices are disclosed. Disclosed are sensor devices for mounting on a fixed resistance having a low-pressure probe for extending through the fixed resistance from a housing and a high-pressure inlet to the housing. Disclosed are sensor devices having a plurality of pressure transducers.

Abstract: A magnetic insertion meter is disclosed herein. Disclosed insertion meters include in some examples, a sensor head tube cylinder having a textured front surface and at least two electrodes. Disclosed insertion meters include a textured front surface adapted to move the separation point of a fluid flowing over the sensor head tube towards the upstream surface as compared to the same sensor head tube without the textured front surface. Methods of measuring flow are also disclosed herein using example magnetic insertion meters.

Abstract: Differential pressure airflow sensor devices are disclosed. Disclosed are sensor devices for mounting on a fixed resistance having a low-pressure probe for extending through the fixed resistance from a housing and a high-pressure inlet to the housing. Disclosed are sensor devices having a plurality of pressure transducers.

Abstract: Differential pressure airflow sensor devices are disclosed. Disclosed are sensor devices for mounting on a fixed resistance having a low-pressure probe for extending through the fixed resistance from a housing and a high-pressure inlet to the housing. Disclosed are sensor devices having a plurality of pressure transducers.

Abstract: Differential pressure airflow sensor devices are disclosed. Disclosed are sensor devices for mounting on a fixed resistance having a low-pressure probe for extending through the fixed resistance from a housing and a high-pressure inlet to the housing. Disclosed are sensor devices having a plurality of pressure transducers.

Abstract: A transit time flow sensor is configured as an insertable probe carrying transducers spaced apart along an acoustic path that may be segmented. The transducers are attached to non-wetted surfaces of respective tabs extending outwardly from the probe and functioning as acoustic windows. The tabs are selectively skewed with respect to the probe's flow axis so that acoustic signals from one transducer are detected by another. Directly communicating transducers may be on the same or opposite sides of the probe's flow axis.

Abstract: A transit time flow sensor is configured as an insertable probe carrying a pair of transducers spaced apart along an acoustic path. The transducers are attached to respective tabs extending outwardly from the ends of a tubular member and skewed with respect to an axis of the tube so that acoustic signals from one of the transducers are reflected from an interior portion of the tube and subsequently detected by the other transducer.

Abstract: A thermal flow sensor is responsive only to a modulated component of the flow. At zero flow the modulated component disappears, except for an artifact caused by motion of the modulator. This artifact is minimized by reducing the extent of modulator motion and by sampling the modulated signal at a quiescent part of the modulator's operating cycle. This results in a thermal flow sensor with a very stable zero.

Abstract: A vortex-shedding flowmeter uses two flow obstacles to provide stable generation of vortices that are detected as they pass through an ultrasonic beam between two transducers. The deleterious effects of acoustic signals reflected from the obstacles are minimized both structurally and electronically. The shapes of the obstacles are selected to reflect incident acoustic signals away from the beam between the transducers. Ultrasonic signals are generated simultaneously by two phase-opposed transducers and are detected in a time-windowed fashion in which the time window excludes extraneous reflected signals that have a longer path length.

Abstract: The disclosed flow monitoring apparatus has a flow-varied sensing capacitance and an inductor in a series-resonant circuit that modulates the frequency of an oscillator. In one apparatus, the sensing capacitance comprises a flow-activated vaned rotor whose blades sweep past a very small capacitive sensing electrode, for monitoring flow rates. In other apparatus a flow-activated blade is biased to remain opposite a very small capacitive sensing electrode, to provide on/off flow indication.