Calibrating apparatus for isothermally introducing moisture into a stream of dry gas at a very slow rate
US5294378A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1993 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Feb 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A calibrating apparatus for isothermally introducing, into a stream of dry gas, amounts of moisture lower than 1000 ppb, said apparatus comprising: PA1 A. a moist gas generating unit, comprising in its turn: PA2 i) a cylindrical shell; PA2 ii) a permeation module, inside said cylindrical shell, containing water and comprising a peripheral membrane; PA2 iii) a thermal conditioner, arranged too inside said cylindrical shell, upstream of said permeation module; PA1 B. an isothermal heat sink, thermally connected to the outside surface of said cylindrical shell, wherein said moist gas generating unit, under item A), is lodged in a recess of said heat sink; PA1 C) a heat radiator; PA1 D) a Peltier heater-cooler, thermally arranged between said isothermal heat sink (under item B) and said heat radiator (under item C).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.