Gas mixing device and gas analyzer making use of the same

Details Gas mixing device and gas analyzer making use of the same Gas mixing device and gas analyzer making use of the same

1989-09-08

1990-12-18

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

137606, G01N 3100

Patent

active

049777769

ABSTRACT:
A gas mixing device of a blood gas analyzer has a substrate made of a material such as silicon and a plate having a flat smooth surface, made of a material such as glass. The plate is bonded to the substrate. The substrate has a plurality of fine elongated grooves extending between inlet and outlet ports formed in the plate. Different gases are introduced through the respective inlet ports, and combined with each other in the gas mixing device. The levels of flow resistance in branch grooves are so determined that the different gases are mixed at predetermined mixing ratios for delivery to the outlet ports. Further, the analyzer includes the gas mixing device and a measuring unit equipped with a plurality of gas measuring electrodes. The mixture gas from the gas mixing device is made to bubble through a buffer solution in a reservoir for producing a standard liquid measuring unit that is delivered at predetermined time intervals to the analyzer for calibration.

REFERENCES:
patent: 3464434 (1969-09-01), Nielsen
patent: 4151738 (1979-05-01), Hyer et al.
patent: 4209300 (1980-06-01), Thibault
patent: 4380250 (1983-04-01), Stoll
patent: 4474889 (1984-10-01), Terry et al.
patent: 4498496 (1985-02-01), Barcellona et al.
patent: 4512953 (1985-04-01), Marsoner et al.
patent: 4696183 (1987-09-01), Mitsumaki et al.

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