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| Number | Title | Issue Date |
| 7325439 | Fluid permeability measurement system and method A system for measuring the permeance of a material. The permeability of the material may also be derived. The system provides a liquid or high concentration fluid bath on one side of a material test sample, and a gas flow across the opposing side of the material tes... | 02/05/2008 |
| 7020562 | Method of monitoring the operation of gas sensor and system therefor A method of monitoring the operation of a gas sensor is disclosed. A system signal is provided in response to sensing first or second system conditions, and a gas concentration signal is provided in response to sensing first or second gas concentration levels of a g... | 03/28/2006 |
| 6671584 | Mass flow rate-measuring method and mass flow rate control apparatus The real mass flow rate is calculated for a variety of gases. The variety of gases are classified into a plurality of classifications, and representative discharge coefficient relationships are previously determined for the respective classifications. Whe... | 12/30/2003 |
| 6652732 | Fan flow sensor for proton exchange membrane electrolysis cell A fan flow sensor for a gas generating proton exchange member electrolysis cell includes a switching device and a sail disposed in communication with the switching device. The sail is pivotally mounted and movable in response to an airflow from a fan. The... | 11/25/2003 |
| 6234004 | Method for measurement of flow velocity or diffusivity, microsensor and application of such microsensor The invention relates to a method and a microsensor for measurement of transport coefficients like diffusivity or flow velocity. The microsensor has a reservoir provided with a mouth and a transducer. The transducer has a tip placed in the mouth, which ca... | 05/22/2001 |
| 6192737 | Method for measuring the concentration of a dissolved gas in a fluid The invention pertains to a method for measuring the concentration of dissolved gases in a liquid [(39)], especially of CO2 in beverages, in which the liquid [(39)] is passed across the retentate side [(140)] of a membrane [(14)] that is at lea... | 02/27/2001 |
| 6169962 | Systems and methods for controlling gas flow from landfills An automated, computer-controlled landfill gas recovery system includes a number of equipment vaults, with each vault being associated with one or more wells in the landfill. The wells are in fluid communication with a piping system located in the associa... | 01/02/2001 |
| 5856119 | Method for monitoring and controlling biological activity in fluids A method of monitoring a microbiological process in a fluid supply involving isolation of a fluid sample from a fluid supply, measuring the pH of the fluid sample at selected time intervals, then calculating changes in pH, if any, to determine a pH variat... | 01/05/1999 |
| 5747749 | Acoustic logging to identify oil flow rate A method and apparatus for determining the various components of a multi-phase fluid flow in a defined area includes using an acoustic transceiver tool to direct a beam of acoustic energy toward the fluid flow in a producing well or a horizontal line. A s... | 05/05/1998 |
| 5355739 | Apparatus for measuring gas emission rate from soil Gas flux rate from a surface is measured using an elongated tubular housing having a lower open end and an upper open end with a support positioned within the housing a predetermined distance from the lower open end. A gas sampling wand extends into the h... | 10/18/1994 |
| 5295083 | Device for dynamically measuring bubble content of flowing liquid A device for dynamically measuring the bubble content of a flowing liquid is arranged in a conveyance passage for a flowing liquid or provided in a simple bypass for the conveyance passage of the liquid so that the bubble content of the flowing liquid and... | 03/15/1994 |
| 5100624 | Apparatus for determining the stability of a peroxygen An apparatus and a method is provided for measuring the rate of flow of gas from a sample of a peroxygen, such as, hydrogen peroxide, thereby indicating the stability of the peroxygen. The invention overcomes the disadvantages of the prior methods which a... | 03/31/1992 |
| 5063519 | Landfill gas production testing and extraction method A method for determining total landfill gas production capability and pollutant emission rates involves measuring gas pressure in a soil cover at various locations around the landfill. These measurements are preferably made successively and repeated. The ... | 11/05/1991 |
| 5040126 | Method for predicting steady-state conditions To stabilize flow rate in a single-stroke, syringe-type high pressure pump to a constant value after turn-on, a control system; (1) in one embodiment, senses the maximum rate of change of pressure, detects a pressure when the rate of change is two-thirds ... | 08/13/1991 |
| 4635468 | Gas monitoring method and device A method for monitoring air inleakage and oxygen content in a steam system, including the steps of: monitoring air flowing in the exhaust of a condenser; determining the total gas flow rate and oxygen content thereof; injecting a pulse of oxygen into the ... | 01/13/1987 |
| 4487054 | Method for projecting landfill gas collection rate of a surface collector A method for projecting the landfill gas collection rate of a surface collector, including removing some of the cover material from the landfill to expose a test area of the refuse in the landfill and measuring the venting rate of the landfill gas through... | 12/11/1984 |
| 4444041 | Method and apparatus for determining the venting rate of landfill gas A method of measuring the flow of landfill gas from a surface of a landfill comprising placing a receiver having an opening therein on the landfill surface so that the landfill gas can flow through the opening and enter the receiver, conducting the landfi... | 04/24/1984 |
| 4304120 | Automatic gas measurement and analysis for a test cell A method and apparatus for automatic measurement of gas flow rate and gas volume from a test cell. By this method, low rates of gas production may be measured, and means are provided to limit flow rates to maximum and minimum values measurable in a mass f... | 12/08/1981 |
| 4289018 | Method and apparatus for measuring degasification A method is provided for measuring the amount of gas in a liquid system which comprises a tank and a vacuum pump. The method includes the steps of operating a vacuum pump to exert a predetermined vacuum upon the liquid in order to desolubilize gas from th... | 09/15/1981 |
| 4272982 | Fluid flow meter for mixed liquid and gas A fluid flow meter for a fluid containing mixed liquid and gas. It has positive displacement structure that incorporates density measurement of segments of the mixed liquid and gas, while the linear velocity of both components is the same. There may be me... | 06/16/1981 |
| 4184359 | Gas monitor for liquid flow line A device for measuring the concentrations of entrained and/or dissolved gases in a liquid flow, that includes a gas/liquid separating chamber, probes for monitoring depression of the liquid level in that chamber by separated gases, a regulator for providi... | 01/22/1980 |
