摘要:
A method of contemporaneously monitoring changes in analyte concentration in a plurality of samples, the method comprising the steps of providing a plurality of separate vessels each having an analyte sensitive probe therein, filling each vessel with a test sample, periodically interrogating the probe within each filled vessel employing a single interrogation device, wherein interrogations measure changes in the probe reflective of changes in analyte concentration in the sample, an initial interrogation is taken at time t0 for each filled vessel, subsequent interrogations are taken periodically on a schedule measured from t0, and the initial interrogation of each filled vessel is taken at a different time of day.
摘要:
An instrument (10) for detecting leaks in a hermetically sealed package (100). The instrument (10) includes a hollow needle (20), a mass flow rate sensor (50) in sealed fluid communication with a lumen (29) defined by the hollow needle (20), and a vacuum pump (40). The vacuum pump (40) is in fluid communication with the lumen (29) defined by the needle (20) for evacuating gas from the hermetically sealed package (100), and in fluid communication with the mass flow sensor (50) for detecting mass flow from the evacuated package (100) into operable contact with the mass flow rate sensor (50) so as to permit sensing of any continuing mass flow from the evacuated package.
摘要:
A calibration card 10 and method of using the card 10 to calibrate an optical sensor. The card 10 comprises (i) a first mass of an oxygen sensitive fluorophore 41 configured and arranged for limiting exposure of the first mass of oxygen sensitive fluorophore 41 to near zero % oxygen, and (ii) a second mass of an oxygen sensitive fluorophore 42 configured and arranged for exposing the second mass of fluorophore 42 to an environmental concentration of oxygen.
摘要:
An instrument (10) for detecting leaks in a hermetically sealed package (100). The instrument (10) includes (i) a hollow needle (20), (ii) a mass flow rate sensor (70) in sealed fluid communication with the lumen defined by the hollow needle (20), and (iii) a vacuum pump (60). The vacuum pump (60) is in fluid communication with the lumen defined by the needle (20) for evacuating gas (102) from the hermetically sealed package (100), and in fluid communication with the mass flow rate sensor (70) for directing mass flow from the evacuated package (100) into operable contact with the mass flow rate sensor (70) so as to permit sensing of any continuing mass flow from the evacuated package (100). The instrument (10) may further include an oxygen sensor (40) in sealed fluid communication with the lumen defined by the hollow needle (20) for analyzing the oxygen concentration of the gas (102) within the hermetically sealed package (100).
摘要:
A needle valve (10) with a hollow needle (70) effective for permitting a portion of the fluid passing through the valve to flow throughout the valve and exit through any leaks in the valve, whereby any environmental fluid within the valve is displaced by the fluid passing through the valve.
摘要:
A sensor for detecting volatile organic compounds in ambient air by positioning a detection cell adjacent a gas discharge device to cause molecules of organic compounds to become ionized, and applying an electric field across the collection cell to attract ions and free electrons formed in the cell to develop a current, and amplifying the current magnitude so created.