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| Number | Title | Issue Date |
| 4794784 | Leak detector calibrating device A leak detecting apparatus includes a detector arranged for sensing a gas emanating through a specimen to be tested for leaks; a leak simulator having an outlet emitting a gas of a known flow rate; and a valve for selectively connecting the outlet to the ... | 01/03/1989 |
| 4793173 | Process for calibrating a gas metering instrument A process for calibrating a gas metering instrument comprises flushing a test chamber with a flushing gas and subsequently filling it with a calibrating gas having a predetermined composition of carrier substance and carrier gas. The calibrating gas does ... | 12/27/1988 |
| 4723436 | Process for calibrating a gas metering instrument A process for calibrating a gas metering instrument comprises flushing a test chamber with a flushing gas and subsequently filling it with a calibrating gas having a predetermined composition of carrier substance and carrier gas. The calibrating gas does ... | 02/09/1988 |
| 4715985 | Composition for checking the functioning of fire detection installations and application to various types of detectors Compositions for checking the functioning of fire detectors comprising at least 75% of at least one haloalkane, up to 15% of at least one volatile organic compound selected from the group consisting of alcohols, oxoderivatives, and ethers, a small amount ... | 12/29/1987 |
| 4691168 | High purity water calibrating device Apparatus for calibrating a conductivity instrument having a conductivity cell and a conductivity measuring instrument operatively associated with the conductivity cell, includes a conduit for supplying high purity water to be measured; a first flow line ... | 09/01/1987 |
| 4618587 | Method for the quantitative determination of calcium in biological fluids through direct potentiometry A method is disclosed for determining calcium ion content of serum which comprises calibrating a potentiometric analytical system with calcium standards having a solution containing both TRIS and BisTRIS at a pH of 7.5. The serum sample is diluted with a ... | 10/21/1986 |
| 4553423 | Gas doser A gas doser, including a gas input member, a gas output member and a charge-over rotor therebetween. The input member includes a gas input member having a carrier gas input port, a calibrating gas input port, a first chamber communicating with the carrier... | 11/19/1985 |
| 4545235 | Gas analyzer with aspirated test gas A gas analyzer arrangement and method of operating the arrangement comprise a probe which extends from a test space containing a sample gas, to an input line which is connected to an analyzer for analyzing the sample gas. An output line is connected to th... | 10/08/1985 |
| 4534204 | Calibration method for ultra sensitive noble gas leak detector A process of calibrating an ultrasensitive noble gas leak detector using a radioactive alpha source, such as americium 241, comprising accumulating helium molecules from the radioactive alpha source in an enclosed volume for a specified period of time, pe... | 08/13/1985 |
| 4524606 | Low flow calibrator A low flow calibrator in which a closed manifold type system is provided that includes a differential pressure transducer with null indication with valving means for opening the system to the atmosphere and for initially nulling the differential pressure ... | 06/25/1985 |
| 4474048 | Calibrating gas generator A calibrating gas generator comprises two series connected solution tanks filled with an aqueous ethanol solution which are connected together so that a pump may direct air so that it successively bubbles through the ethanol solution in each tank and exit... | 10/02/1984 |
| 4454752 | Test circuit for use in coagulation instrument In a photometric coagulation instrument a synthetic clot signal is generated so that the operation of the instrument can be checked without the need to measure the actual clotting time of a control plasma sample.... | 06/19/1984 |
| 4411151 | Device for calibrating gas electrodes A device for calibrating gas electrodes inserted into a gas testing container within sterile environment of an operation room is mounted on a movable frame and has one side to be sterilized and carrying a work table with the gas testing container and anot... | 10/25/1983 |
| 4407152 | Breath test simulator and method A breath test simulator and method for accurately calibrating breath test instruments used to determine the concentration of ethyl alcohol in breath. The simulator includes concentric chambers filled with a known concentration of ethyl alcohol-water solut... | 10/04/1983 |
| 4314344 | Method and apparatus for generating selected gas concentrations A method and apparatus for generating an adjustable concentration of a selected gas within a carrier gas flow including a gas generator which is responsive to a drive signal. A gas analyzer detects the selected gas concentration within the carrier gas flo... | 02/02/1982 |
| 4271693 | Device for testing smoke detector alarms A device for testing smoke detector alarms comprises a base housing upon which is mounted an extendable telescopic assembly comprising three tubes, with the top tube having a combustible pellet mounted at its upper end. The pellet is composed of a substan... | 06/09/1981 |
| 4269057 | Multipurpose humidity controlled agent generator A test agent generator system capable of producing a controlled concentran of chemical agent vapors and aerosols under variable, controlled temperature and relative humidity conditions for use in a method of calibrating and testing agent sensitivity of a... | 05/26/1981 |
| 4213325 | Device for introducing particles into analyzer of dustiness of gaseous medium A device for introducing particles into an analyzer of dustiness of a gaseous medium comprises a cell having a transparent cover with a microscope arranged thereabove. A through guide duct is made in a wall of the cell, while provided in the bottom of the... | 07/22/1980 |
| 4147976 | Device for testing and calibrating moisture measuring instrument A testing and calibration device is provided for a known type of electrical instrument for measuring moisture in a grain sample. The instrument comprises a sample-receiving test cell in the form of a cylindrical container having a concentric electrode the... | 04/03/1979 |
| 4142860 | Apparatus for producing a calibration sample for analytical instrumentation Apparatus for and method of preparing reference mixture gas samples for use with analytical instrumentation and small scale chemical reactions and processes, having a motor-driven magnetic stirrer with the motor and driving magnet mounted externally of th... | 03/06/1979 |
| 4141654 | Standard for calibrating and/or verifying instrument accuracy A device for use in checking and/or calibrating the accuracy with which a blood constituent concentration measuring instrument is operating. The device includes a capillary tube size member having annular bands marked on its outer surface. The bands are o... | 02/27/1979 |
| 4136550 | Method of and device for checking hygrometers and hygrostats A method of and device for checking hygrometers and hygrostats, according to which the hygrometer or hygrostat is at its place of mounting checked by means of a reference device, such as a reference hygrometer directly indicating the air humidity. The ref... | 01/30/1979 |
| 4094187 | Stack gas analyzing system with calibrating/sampling feature A stack gas analyzer with a sampling probe mounted in the stack has a subsystem for supplying calibrating gases and blanking air to one or more gas analyzers either through the probe or directly. The rates of flow in the system are established to permit t... | 06/13/1978 |
| 4069701 | Portable agent generator A test agent, generation system capable of producing a low constant vapor test agent for use in a method of calibrating and checking the GB agent sensitivity of a point-source alarm system.... | 01/24/1978 |
| 4056966 | Apparatus for calibration of a moisture analyzer The apparatus, with a disposable cartridge, is connected into the sample-input-line of the to be calibrated moisture analyzer. The cartridge contains a substance with previously determined, chemically bonded, moisture content. A motor-driven carriage with... | 11/08/1977 |
| 4056967 | Pneumatic system for a gas sensor A pneumatic system for controlling admission of gas samples to a toxic gas monitoring sensor, characterized by including an internally isolated, series pneumatic circuit for continuously circulating purging gas through the sensor, in combination with a ga... | 11/08/1977 |
| 3943774 | Precision temperature control A method and apparatus for accurately holding a sample at a temperature in the range below 0°C by maintaining a constant temperature drop between an apparatus holding the sample and a coolant which is at a lower temperature, accompanied by inflow and out... | 03/16/1976 |
