METHOD AND DEVICE FOR MEASURING MASS OF FLUDIZED MEDIUM

A device which serves to measure the mass of a flowing medium, in particular the mass of the air aspirated by an internal combustion engine. The device includes a substrate on the bottom and top of which there is disposed a respective temperature-dependent resistor electrically connected in parallel...

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description A device which serves to measure the mass of a flowing medium, in particular the mass of the air aspirated by an internal combustion engine. The device includes a substrate on the bottom and top of which there is disposed a respective temperature-dependent resistor electrically connected in parallel and preferably embodied as a film, on both sides of which at peripheral areas low-impedance electrical conductor tracks are provided. The peripheral areas of the substrate are partially encompassed by U-shaped deformations provided on metallic retainers. The retainers simultaneously serve as electrical connections via soldered areas provided between the U-shaped deformations and the conductor tracks. The retainers protrude into the flow of the medium and have good thermal conductivity, so that they are virtually at the temperature of the flowing medium, and hence the temperature of the peripheral areas is also kept at the temperature of the flowing medium. To reinforce this effect, additional thermal conduction surfaces on the retainers or further thermal conduction elements which have good thermal conductivity, can be provided. With the temperatures of the peripheral areas kept to the temperature of the flow of the medium, short startup and response times are provided by the device even when there are sudden major changes in the mass of the flowing medium.
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To reinforce this effect, additional thermal conduction surfaces on the retainers or further thermal conduction elements which have good thermal conductivity, can be provided. 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The device includes a substrate on the bottom and top of which there is disposed a respective temperature-dependent resistor electrically connected in parallel and preferably embodied as a film, on both sides of which at peripheral areas low-impedance electrical conductor tracks are provided. The peripheral areas of the substrate are partially encompassed by U-shaped deformations provided on metallic retainers. The retainers simultaneously serve as electrical connections via soldered areas provided between the U-shaped deformations and the conductor tracks. The retainers protrude into the flow of the medium and have good thermal conductivity, so that they are virtually at the temperature of the flowing medium, and hence the temperature of the peripheral areas is also kept at the temperature of the flowing medium. 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subjects MEASURING
MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL
METERING BY VOLUME
PHYSICS
TESTING
title METHOD AND DEVICE FOR MEASURING MASS OF FLUDIZED MEDIUM
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