Differential dilution sampling probe
OwnerRobert L. Tomlininventor
Life of this patent
Estimating the term…
Abstract
A method and apparatus for sampling and dilution of a process gas stream. A probe is inserted into the stream, the probe being open at its front end, and a precisely regulated flow of a dilution gas is inputted at a mid-point of the probe. A precisely regulated, and greater flow of unfiltered gas is withdrawn from the rear end of the probe. The difference between the input flow and the withdrawn flow is process gas which is diluted by the dilution gas, and the ratio of process gas to withdrawn flow can be precisely regulated.
Claims24
An apparatus for sampling and dilution of a process gas, comprising:
- probe means comprising a body portion adapted for insertion into a process gas stream and having first and second ends, said first end being open and comprising an inlet for process gas, and a closed interface block at said second end of said body portion, closing said second end;
- a differential flow assembly comprising means for supplying a precisely regulated flow of dilution gas to said probe means, and means for withdrawing a precisely regulated flow of diluted gas from said probe means which is greater than the flow of dilution gas;
- a dilution gas inlet means comprising a tube passing through said interface block into said body portion and terminating at a point located between said first and second ends and flow connected through said interface block to said means for supplying dilution gas;
- a diluted gas outlet within said probe means and located closer to said second end than said dilution gas inlet means, said diluted gas outlet flow connected to said means for withdrawing;
- means for passing diluted gas from said means for withdrawing to an analysis device.
A dilution probe for sampling process gas comprising:
- a probe comprising a generally cylindrical body portion having first and second ends, said first end being open for withdrawal of gas from a process stream;
- a closed interface block at said second end of said body portion, closing said second end;
- dilution gas supply means comprising a supply tube extending through said interface block into said body portion, and terminating in a gas inlet between said first and second ends;
- and
- diluted gas outlet means comprising a withdrawal tube passing through said interface block and terminating in a gas outlet located closer to said second end than said dilution gas inlet;
- wherein the body portion between said dilution gas inlet and said diluted gas outlet serves as a mixing zone for mixing process gas and dilution gas, and no filtration means are located between said first end and said second end.
Method for sampling and dilution of a process gas from a process gas stream, comprising:
- a) extending into the stream a probe having a first open end and a second closed end, said first end being within said stream;
- b) providing a precisely regulated flow of dilution gas at a first point between said first end and said second end, said first point being at a probe portion within said process stream, and simultaneously withdrawing a precisely regulated gas flow from a second point between said first point and said second end without filtering said gas flow between said open end and said second point, said gas flow withdrawn being greater than said dilution gas flow, thus causing a known flow of process gas to mix with said dilution gas flow and be withdrawn at said second point;
- and
- c) providing said withdrawn gas flow for analysis.
Dependencies are inferred from the claim text.