摘要:
A calibration card (10) and method of using the card (10) to calibrate an analytical instrument capable of reading a photoluminescent oxygen probe. The card (10) includes at least (a) a first mass of an oxygen sensitive photoluminescent dye (51) retained within a hermetically sealed space so as to isolate the dye (51) from environmental oxygen, and in fluid communication with an activated metal-air battery (70) whereby any oxygen permeating into the hermetically sealed space is quickly consumed by the battery (70), and (b) a second mass of an oxygen sensitive photoluminescent dye (52) in fluid communication with the environment whereby the second mass of photoluminescent dye (52) is exposed 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 system and method for providing a destination point with a gas having a selectable known humidity. A gas having an initial relative humidity is alternately directed in accordance with a duty cycle along a wet path effective for humidifying the gas to provide a wet gas, and a dry path effective for either maintaining the initial relative humidity of the gas or dehumidifying the gas to provide a dry gas. The wet and dry gas is blended to produce a blended gas having a selected relative humidity based upon the selected duty cycle.
摘要:
A sensor for detecting water vapor in a gaseous sample. The sensor comprises (a) an anode, (b) a cathode, (c) an electrolyte intermediate the anode and cathode, and (d) an inlet orifice through a central area of the anode or cathode through which the gaseous sample may be placed into contact with the electrolyte. The electrolyte can be retained on a porous electrical-insulating separator located between the interior-facing major surfaces of the anode and the cathode.
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.
摘要:
A fixture for testing a sealed container for possible leakage, having a removable cover (26) and a silicon gel gasket affixed to the undersurface of the cover (26), and having a lower housing (22) with a cavity for receiving the sealed container (10), the container top surface being isolated from the rest of the container surfaces by the silicon gel gasket.
摘要:
A photoionization detector sensor (100) equipped with a temperature compensating and output adjustable ultraviolet lamp driver (200) for supplying an alternating current signal to the ultraviolet lamp (120) effective to light the ultraviolet lamp (120) with direct current supplied from both a first variable voltage supply circuit (Vin) and a second temperature sensitive fixed voltage supply circuit (Vb), and method of standardizing output of the photoionization detector sensor (100) by adjusting the voltage supplied to the driver (200) by the first variable voltage supply circuit (Vin) so that future reported values will more closely approximate actual values.
摘要:
A photoionization detector sensor (100) equipped with an adjustable gain amplifier (140), and method of standardizing output of the photoionization detector sensor (100) by adjusting the gain so that an actual test value expected to produce a known anticipated value matches the anticipated value.
摘要:
A cartridge 10 for use in conjunction with a target analyte permeation testing instrument 100 and method for measuring transmission rate of a target analyte through a prefilled package or container P using the cartridge 10. The cartridge 10 includes an open ended vessel 20, a first end cap 31 capable of repeated sealed engagement over one of the open axial ends 21 or 22 of the vessel 20, a second end cap 32 in sealed engagement over the other open axial end 21 or 22 of the vessel 20, an entrance port 68 for providing fluid communication from a source of carrier gas CG to the void volume 29 of the vessel 20, and an exit port 69 for providing fluid communication from the void volume 29 of the vessel 20 to a target analyte sensor 130.