Apparatus and method for measuring aerosols and gases with detector tubes
US4230457A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1978 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Dec 8, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for measuring gases and aerosols with a detector tube, comprises, a duct or test tube for the passage of a test gas therethrough which includes a forelayer in the duct through which the test gas is passed, and which has a substance which will react with the test gas to form a new gas substance. The gas-permeable forelayer advantageously acts as a filter for the aerosol and comprises a substrate, such as a silica gel or a glass fiber, which is impregnated with a material, such as zinc dust and arsenic trioxide which is saturated with water. The aerosol which contains a sulfuric acid in the gas will react after deposit in the forelayer with the zinc forming a nascent hydrogen which reduces the arsenic trioxide immediately to arsenic hydride. The test tube also contains an indicating layer with a material which is known for producing an indication of the newly formed gaseous substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.