Method and means for condensing trace air contaminates from gase

Details Method and means for condensing trace air contaminates from gase Method and means for condensing trace air contaminates from gase

1989-06-19

1991-03-12

Chapman, John

Measuring and testing

Gas analysis

By thermal property

73863110, 422 89, G01N 3012

Patent

active

049984330

ABSTRACT:
A metallic sample block has formed therein a serpentine shaped duct containing glass beads. The block is secured in thermally conductive contact with a thermoelectric element to which voltage of one polarity is applied to chill the block to a range of approximately -25.degree. C. to -90.degree. C. When the block temperature has been lowered sufficiently a gas sample is conveyed in one direction through the duct causing contaminates therein to be condensed out on the beads. Thereafter the polarity of the voltage applied to the thermoelectric element is reversed to cause it to heat the block and vaporize the previously condensed contaminates, after which a carrier gas is conveyed in the opposite direction through the duct to a gas analyzer device.

REFERENCES:
patent: 4312835 (1982-01-01), Zoltan et al.

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