Honeywell International Inc.

Andrew Joseph Milley

Richard Charles Sorenson

Jamie Wandler Speldrich

Lamar Floyd Ricks

Brian Speldrich

William Hoover

Craig Scott Becke

Josh M Fribley

Mohammed Abdul Javvad Qasimi

A heater control circuit in a fluid flow sensor. The circuit comprises first, second, and third resistors, a heater resistor, a trimmable resistor, and a switch. A positive terminal of the first resistor is connected to a positive terminal of the trimmable resistor, a negative terminal of the first resistor is connected to a positive terminal of the heater resistor, a negative terminal of the trimmable resistor is connected to a positive terminal of the second resistor, a negative terminal of the second resistor is connected to a positive terminal of the third resistor, and a negative terminal of the heater resistor is connected to a negative terminal of the third resistor, the terminals of the second resistor are attached to the terminals of the switch, where the switch is configured closed in a calibration mode and configured open in a flow sensing mode.

Flow sensor heater circuit calibration

A sensor housing includes an inlet flow port, an outlet flow port, a flow sensing region, and a flow channel extending between the inlet flow port, the flow sensing region and the outlet flow port. The flow channel defines a flow path between the inlet flow port and the flow sensing region that is contorted in three-dimensions. The three-dimensional contorted flow path between the inlet flow port and a flow sensing region may include a particle collection region that is configured to decelerate a fluid and collect particles that are released from the fluid. The deceleration of the fluid flow and/or one or more changes in the direction of fluid flow along the contorted three-dimensional flow path may cause dust and/or other particulate matter to be released from the fluid prior to reaching a sensor in the sensing region.

Airflow sensor with dust reduction

The present disclosure relates to modular flow sensor assemblies and methods. The modular flow sensor assembly may include a main sensor body, a first end adapter having a first connection port configuration, and a second end adapter having a second connection port configuration. The main sensor body may include a main housing and a sensor, where the first end adapter is configured to engage the main housing and the second end adapter is configured to engage the main housing. The first end adapter and the second end adapter may be selected from a group of end adapters, wherein at least two of the end adapters has a different connection port configuration. The selected first end adapter and the selected second end adapters may have the same or different connection port configurations. The first end adapter and the second end adapter are configured to be interchangeable end adapters.

Modular flow sensor

Apparatus and associated methods relate to a temperature-compensated drive for a heating element used in a micro-bridge flow sensor. In some embodiments, the heating element may be located substantially between two temperature sensors. The two temperature sensors may be convectively coupled to the heater by a fluid ambient. When the fluid ambient is flowing, one of the temperature sensors may be upstream of the heating element, and one of the temperature sensors may be downstream. The fluid may be heated by the heating unit, and this heated fluid may then flow past the downstream temperature sensor. The two temperature sensors may be used in a Wheatstone bridge configuration. In some embodiments, an output signal of the Wheatstone bridge may be indicative of a measure of fluid flow. The temperature-compensated drive for the heating element may enhance, for example, the flow meter's disturbance rejection of ambient temperature.

Temperature compensation module for a fluid flow transducer

A flow sensor assembly includes a flow sensor for sensing a flow parameter. The flow sensor may provide a flow sensor output signal that is related to the sensed parameter. A control block operatively connected to the flow sensor may receive a measure related to the flow rate of the fluid stream and drive the heater of the flow sensor to a heater temperature, such that the heater temperature may be dependent on the flow rate of the fluid stream, which causes the analog output of the flow sensor to be relatively linear over an expected operating range of flow rates.

Flow sensor with improved linear output

A sensor assembly includes a sense element for sensing a sensed parameter. The sense element may provide a sense element output signal that is related to the sensed parameter. A control block may include a first input port for receiving the sense element output signal, a second input port for receiving a scale input adjustable by a user, and an output port for providing a sensor assembly output signal. The control block may be configured to take in the sense element output signal via the first input port and produce the sensor assembly output signal at the output port, wherein the sensor assembly output signal at the output port is related to the sense element output signal and corresponds to a user selected range of the sensed parameter. The user selected range may be determined, at least in part, by the scale input received via the second input port.

Variable scale sensor

A flow sensor assembly that may include features that help prevent moisture from reaching a sensor die of the flow sensor assembly. In some cases, such features may include a bypass channel that is configured to reverse the direction of the flow of fluid at least once upstream of the sensor die. In some cases, an encapsulant may cover one or more bond pads of the sensor die. In some cases, an output of the flow sensor assembly may be a raw sensor output signal produced by the one or more sensor elements of the sensor die, without significant processing of the raw sensor signal.

Flow sensor assembly

A flow sensor includes a main flow body, a laminar flow element, and first and second bypass channels. The first bypass channel is formed in, and extends at least partially around, the outer surface of the laminar flow element, and is in fluid communication with the main flow channel and defines a first bypass flow passage between the laminar flow element and the main flow body. The second bypass channel is formed in, and extends at least partially around, the outer surface of the laminar flow element, and is in fluid communication with the main flow channel and defines a second bypass flow passage between the laminar flow element and the main flow body.

Flow sensor with multi-position laminar flow element having integrated bypass channels

A flow sensor includes a main flow body, a laminar flow element, a first main flow body sensor tap, a second main flow body sensor tap, and a bypass flow body. The bypass flow body is coupled to the main flow body and has a first bypass flow port, a second bypass flow port, and a bypass flow channel between the first and second bypass flow ports. The flow restrictor is disposed within the bypass flow channel.

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Hilliard, OH, United States of America

Andrew Joseph Milley