Biogas sampling apparatus
AssigneeThe Board of Regents for Oklahoma State University
InventorsCharles E. Konemann, Bradford M. Kard
Life of this patent
Estimating the term…
Abstract
There is provided a biogas flux chamber constructed in one embodiment from a metal can with an open bottom and an epoxy interior coating. The chamber is inserted into the soil to allow influx of soil gases. The lid includes a sampling septum and a vent tube to prevent pressure build-up when the lid is in place which allows for an increase in interior gas concentrations. The rubber sampling septum is installed in a hole in the lid. The vent tube is constructed using flexible copper tubing inserted through the lid and secured using a bulkhead-fitting, and rubber O-ring to seal the insertion hole. The copper tubing is bent to form a double-curved ‘C’ shape which positions the open ends of the tube above and below the lid surfaces.
Claims6
A biogas flux assembly for collecting biogas samples from the soil or other source, comprising:
- (a) a collector formed of a gas impermeable material, said collector having a cylindrical sidewall, a collector top having a first and second aperture, and an open bottom, said sidewall and said collector top joined together to form a collector interior;
- (b) a perforable septum installed in said first aperture of said collector top, wherein said septum is in fluid communication with said interior of said collector and with an exterior of said collector;
- and
- (c) a hollow vent tube having a first and a second open terminus, said vent tube passing through said second aperture in said collector top and into said interior of said collector, said first terminus being situated external to said collector and said second terminus being situated within said collector interior, said vent tube providing fluid communication between said collector interior and an ambient atmosphere external to said collector.
An biogas flux assembly for collecting biogas samples from the soil or other source, comprising:
- (a) a collector formed of a gas impermeable material, said collector having a cylindrical sidewall, a collector top having a first and second aperture, and an open bottom, said sidewall and said collector top joined together to form a collector interior;
- (b) a perforable septum installed in said first aperture of said collector top, wherein said septum is in fluid communication with said interior of said collector and with an exterior of said collector;
- (c) a hollow external vent tube and a hollow internal vent tube,
- said external vent tube having an open first external end and an open second external end, said first external end being attached to said collector top at said second aperture, and said second external end being in communication with an atmosphere external to said collector,
- said internal vent tube having an open first internal end and an open second internal end, said second internal end being attached to said collector top at said second aperture and in fluid communication with said first external end through said second aperture, said second internal end being in fluid communication with said interior of said collector.
Dependencies are inferred from the claim text.