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US 11,733,193 B2Granted
Heat tone sensor as well as measuring element for a heat tone sensor
AssigneeDräger Safety AG & Co. KGaA
InventorsMladen Schlichte, Peter Tschuncky, Jürgen Osswald, Sebastian Schröter, Tim Gnoerrlich, Martin Schrader
Life of this patent
Estimating the term…
Abstract
A heat tone sensor includes a housing with a gas inlet and with a gas outlet as well as a device for generating a gas stream of a gas to be tested between the gas inlet and the gas outlet. A measuring element, around and/or through which the gas stream flows, is configured to catalytically burn at least a portion of the gas stream and to send a measurement signal. The measurement signal indicates a quantity of heat released in the process.
Claims20
A heat tone sensor comprising:
- a housing with a gas inlet and with a gas outlet, the housing comprising a housing interior space;
- a device for generating a gas stream, of a gas to be tested, between the gas inlet and the gas outlet, the device being arranged in the housing interior space;
- and
- a measuring element around or through or both around and through which the gas stream flows, and which is configured to catalytically burn at least a portion of the gas stream and to send a measurement signal, which measurement signal indicates a quantity of heat being released in the catalytic combustion of at least a portion of the gas stream, the measuring element being arranged in the housing interior space between the gas inlet and the device, wherein a cross-sectional area of the gas inlet, at right angles to a flow direction of the gas stream, is larger than a cross-sectional area of the gas stream at right angles to the flow direction immediately before the measuring element is reached.
1 more element
A measuring element for a heat tone sensor, the measuring element comprising:
- a jacket with an inlet opening for a gas to be tested and with an outlet opening for the gas being tested, the inlet opening and the outlet opening defining a portion of a flow path of the gas, the inlet opening being located at a spaced location from the outlet opening;
- and
- a catalytically active material disposed in the jacket in an area between the inlet opening and the outlet opening, wherein an extension of the catalytically active material along a flow path of the gas to be tested, between the inlet opening and the outlet opening, is at least 3 times an extension of the catalytically active material at right angles to the flow path.
A heat tone sensor comprising:
- a housing with a gas inlet and with a gas outlet, the housing comprising a housing interior space;
- a device for generating a gas stream, of a gas to be tested, between the gas inlet and the gas outlet, the device being arranged in the housing interior space;
- a measuring element around or through or both around and through which the gas stream flows, and which is configured to catalytically burn at least a portion of the gas stream and to send a measurement signal, which measurement signal indicates a quantity of heat being released in the catalytic combustion of at least a portion of the gas stream, the measuring element being arranged in the housing interior space between the gas inlet and the device;
- and
- an analyzing circuit configured to determine a concentration of at least one combustible substance in the gas to be tested relative to a lower explosion limit of a calibrating gas based on the measurement signal, wherein:
- the measuring element is configured to send at least one additional measurement signal, which at least one additional measurement signal indicates a quantity of heat released during the catalytic combustion;
- the measurement signal and the at least one additional measurement signal are based on measurements in different positions in a catalytically active material of the measuring element;
- and
- the analyzing circuit is further configured to determine an area of the measuring element with maximum quantity of released heat on the basis of the measurement signal and the at least one additional measurement signal.
6 more elements
Dependencies are inferred from the claim text.