METHOD OF MEASURING CONCENTRATION OF COMBUSTIBLE GASES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC G01N25/22 G01N27/16 

FIELD: measuring.

SUBSTANCE: group of inventions relates to measurement equipment, more specifically to means of monitoring concentration of combustible gas in ambient air, in particular methane, hydrogen, ammonia and some other combustible gases, which enable to measure concentration in a wide range from 0 to 100 %. Proposed method is based on using thermocatalytic and thermoconductometric sensors with diffusion access of analysed medium, which are heated by passing current, voltage drop across them is measured and concentration of combustible gas is determined taking into account changes in environmental parameters. Determination of low concentrations of combustible gas is carried out using the voltage drop on the thermocatalytic sensor as a measuring signal until a given concentration value is achieved. Further determination of concentration is carried out using readings of a thermal conductivity sensor until the concentration value returns to a given value. Essence of the solution lies in the fact that voltage signals from sensors are converted into frequency and counted by a binary counter, number of discharges of which is determined based on the range of the variable part of the voltage on the sensor and the required measurement accuracy. For these purposes, a voltage-to-frequency converter connected to the input of a binary counter is used as a converter.

EFFECT: high accuracy of measurements with simultaneous simplification of the circuit.

7 cl, 3 dwg