Isokinetic extractive sampling probe

Details Isokinetic extractive sampling probe Isokinetic extractive sampling probe

1983-05-05

1986-01-28

Swisher, S. Clement

Measuring and testing

Sampler, sample handling, etc.

Automatic control

7386358, G01N 120

Patent

active

045663424

ABSTRACT:
A flow-rate proportional (isokinetic) sampling probe provided with two identical axial-flow thermal flow sensors whose outputs are used in a differential manner together with a sampling nozzle flow controller to extract a flow-rate proportioned sample of fluid passing thereby, wherein one flow sensor is used to sense the velocity of the fluid and the second flow sensor is used to sense the velocity of the fluid captured by the sampling nozzle, the area of which is the same as that for the flowing fluid such that the differences between the flow sensor outputs is directly used to control the sample flow rate and maintain an isokinetic condition under a wide range of fluid conditions. Two identical temperature sensors used respectively for the flow sensors to automatically adjust the operating temperature of the thermal sensors as the ambient temperature changes.

REFERENCES:
patent: 3261199 (1966-07-01), Raynor
patent: 3866475 (1975-02-01), Thompson et al.
patent: 3965748 (1976-06-01), Boubel
patent: 4317365 (1982-03-01), Lauterbach

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