US 7,406,854 B2 · Gas sensor

Abstract

A gas sensor is provided that is delimited from the environment with a preferably replaceable cap (8) made of a porous, gas-permeable and water-impermeable material, especially sintered PTFE. The gas sensor is protected against environmental moisture and can be permanently provided with the cap (8) and with a special calibrating adapter (9) both during the gas measurement and during the necessary calibration. Due to the special design of the cap (8) and the calibrating adapter (9), the gas sensor offers the possibility of remote calibration, which can be carried out with high accuracy and is independent from weather effects, especially wind.

Claims17

Dependent claims

A gas sensor, comprising:

a measuring element, which generates a measured signal that depends on the concentration of a measured gas;
a cylindrical cap to delimit the gas sensor from the environment, said cylindrical cap having a top wall and a side wall made of a porous, gas-permeable and water-impermeable material, whereby gas passes through said top wall in an axial direction and gas passes through said side wall in a radial direction, said top wall and said side wall having a surface exposed to the environment;
and
a calibrating adapter having a gas admission pipe connection for supplying a calibrating gas to the cap of the gas sensor, said calibrating adapter being attached to or screwed on the cap, said cap having a smaller layer thickness and/or a higher porosity in an area of the gas admission pipe connection than in a remaining area.

1 more element

Dependencies are inferred from the claim text.

Gas sensor

Life of this patent

Gas sensor

Life of this patent

Abstract

Claims17