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Honeywell AWM3100V Microbridge Mass Airflow Sensor Deals

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Product Information:
RS Components - Honeywell Amplified Airflow Sensor, -200 sccm → 200 cm³/min, AWM3000 Series

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Honeywell AWM3100V Product Details:

Product Name: Honeywell AWM3100V Microbridge Mass Airflow Sensor

Product Category: Tools in Hardware

Manufacturer: Honeywell

Product Features :

  • No features available.
Product Description :

Applications· Damper control for heating, ventilation, and air conditioning systems· Gas analysers· Low vacuum control· Process control· Medical respirators and ventilators· Oxygen concentrators· Leak detection equipment· Vent hoods· Anesthesia control· Gas metering· Gas chromatographyOperating principleThe microbridge mass airflow sensor operates on the theory of heat transfer. Massairflow is directed across the surface of the sensing elements. Output voltage varies in proportion to the mass air or other gas flow through the inlet and outlet portsof the package. The specially designed housing precisely directs and controlsthe airflow across the microstructure sense element. Mechanical design of thepackage allows it to be easily mounted to printed circuit boards.The microbridge mass airflow sensor has a unique silicon chip based on advanced microstructure technology. It consists of a thin-film, thermally isolated bridge structure containing heater and temperature sensing elements. The bridge structure provides a sensitive and fast response to the flow of air or other gas over the chip. Dual sensing elements positioned on both sides of a central heating element indicate flow direction as well as flow rate. Laser trimmed thick film and thin film resistors provide consistent interchangeability from one device to the next.The microbridge mass airflow sensor uses temperature-sensitive resistors deposited within a thin film of silicon nitride. They are suspended in the form of two bridges over an etched cavity in the silicon, shown below. The chip is located in a precisely dimensioned airflow channel to provide a repeatable flow response. Highly effective thermal isolation for theheater and sensing resistors is attained by etching the cavity space beneath the flow sensor bridges. The small size and thermal isolation of the microbridge mass airflow sensor are responsible for the extremely fast response and high sensitivity to flows.Dual Wheatstone bridges control airflow measurement — one provides closed loop heater control, the other contains the dual sensing elements. The heater circuit minimizes shift due to ambient temperature changes by providing an output proportional to mass flow. The circuitkeeps the heater temperature at a constant differential (160°C) above ambient air temperature which is sensed by a heat-sunk resistor on the chip. The ratiometric voltage output of the device corresponds to the differential voltage across the Wheatstone bridge circuit.

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