Combustible gas detection device
US9285333B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2012 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Nov 2, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A combustible gas detection device includes an energization control circuit which controls the switching of the energization state of a heat generation resistor every predetermined time period such that the heat generation resistor alternately has resistances corresponding to two predetermined temperatures, a temperature measurement resistor disposed on the same substrate on which the heat generation resistor is disposed, where its resistance changes with the environmental temperature, a gas concentration computation section which calculates the combustible gas concentration by using a voltage generated across the heat generation resistor which is detected when electricity is supplied to the heat generation resistor and the environmental temperature based on a voltage change caused by a change in the resistance of the temperature measurement resistor. The predetermined time period is such that a change in the environmental temperature which occurs when the energization control circuit switches the energization state, falls within a range of 0.5° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.