Pressure reduction device for particle sampling from compressed

Details Pressure reduction device for particle sampling from compressed Pressure reduction device for particle sampling from compressed

1989-03-08

1990-10-16

Noland, Tom

Measuring and testing

Sampler, sample handling, etc.

Capture device

G01N 122

Patent

active

049626736

ABSTRACT:
Disclosed is a device for particle sampling from compressed gases. The device allows for anayzing particles from compressed gases of a pressure ranging from 20 psi to 3000 psi. In the device, the formula D.sub.s =D.sub.t .sqroot.(Q.sub.s /Q.sub.t) is applicable wherein D.sub.s and D.sub.t are the probe diameter and the chamber diameter, respectively, Q.sub.s is the sampling flow rate required by monitoring instruments, and Q.sub.t is the total flow rate determined by the orifice diameter and pressure whereby the sampling velocity substantially matches the local flow velocity at the probe. In addition, a distance between the orifice and the probe is greater than L wherein L=D.sub.c / (2 tan .alpha.) where D.sub.c is the chamber diameter and .alpha. is the half angle of jet expansion.

REFERENCES:
patent: 3289481 (1966-12-01), Barnes
patent: 3522734 (1970-08-01), Lurby
patent: 4032395 (1977-06-01), Burnette
patent: 4586390 (1986-05-01), Helke

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