| 摘要 |
Apparatus for preparation of calibration gas mixtures comprises an accurate cylinder divided into first and second chambers for two gases to be mixed in exact proportions by a piston which can be displaced by a precise linear distance by a stepper motor driven micrometer; the piston has a valved passage to allow transfer of a thus precisely determined volume from the second chamber to gas in the first chamber at balanced pressures; stirrers, temperature and pressure sensors are provided, a device for introducing vaporized drops to the gas in the first chamber is provided. The apparatus can provide mixtures in the parts per million and parts per billion ranges and one or more apparatuses can be linked to a personal computer.
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