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    • 5. 发明授权
    • Flash point testing apparatus and method
    • 闪点测试仪和方法
    • US5182940A
    • 1993-02-02
    • US778006
    • 1991-10-17
    • Kenneth M. BaileyRex L. MitchenerTimothy J. WehkingCraig P. Reith
    • Kenneth M. BaileyRex L. MitchenerTimothy J. WehkingCraig P. Reith
    • G01N25/52G01N27/16
    • G01N25/52G01N27/16
    • Apparatus is provided for continually monitoring the flash point temperature of a liquid pertoleum product flowing through a pipeline. The apparatus is located adjacent the pipeline for periodically drawing product samples therefrom and for testing the samples to determine the respective flash point temperatures. The apparatus includes a microprocessor, which is programmed to control the operation of the apparatus, a testing chamber and a Wheatstone bridge circuit for measuring the Lower Explosive Limit (LEL) of a combustible gas-air mixture which is drawn through the testing chamber. The gas-air mixture ignites on the surface of an active resistive filament, thereby increasing its temperature and resistance, which causes a current to flow within the magnitude bridge circuit. The magnitude of the current is directly proportional to the change of resistance of the active filament and the LEL of the vapor-air mixture. The microprocessor computes the flash point temperature of the sample based on the measured LEL and on the temperature and API gravity of the liquid sample. A backup Wheatstone bridge circuit is provided in the event of failure or degradation of the primary active filament. The microprocessor automatically switches to the backup bridge circuit in the event of a malfunction of the primary bridge circuit.
    • 提供了用于连续监测流过管道的液体包勒产品的闪点温度的装置。 该设备位于管道附近,用于周期性地从其中抽出产品样品并用于测试样品以确定相应的闪点温度。 该装置包括微处理器,其被编程以控制装置的操作,测试室和惠斯通电桥电路,用于测量通过测试室抽出的可燃气体 - 空气混合物的下限爆炸极限(LEL)。 气体 - 空气混合物在活性电阻丝的表面上点燃,从而增加其温度和电阻,这导致电流在大桥电路内流动。 电流的大小与活性丝的电阻变化和蒸汽 - 空气混合物的LEL成正比。 微处理器基于测量的LEL和液体样品的温度和API重力计算样品的闪点温度。 在主活动灯丝发生故障或退化的情况下,提供备用惠斯登电桥电路。 在主桥电路发生故障的情况下,微处理器自动切换到备用电桥电路。
    • 6. 发明授权
    • Method and arrangement for measuring the flash point of liquids and
solids
    • 用于测量液体和固体的闪点的方法和装置
    • US5176449A
    • 1993-01-05
    • US795044
    • 1991-11-20
    • Werner Grabner
    • Werner Grabner
    • G01N25/50G01N25/52
    • G01N25/52G01N25/50
    • The present invention is related to a device and method for determining the flash point of a liquid or solid material to be tested by measuring the pressure obtained in the measuring chamber after an ignition. According to the invention, a liquid or solid is placed into a measuring vessel and the measuring vessel is heated. The measuring vessel is tightly closed with a cover. At a given temperature the generated vapor-air-mixture is ignited and the pressure increase occurring due to the temperature increase is taken as a measure for the size of the flame for determining the flash point. The pressure increase is preferably measured with a piezoresistive pressure transducer. The temperature of the heated cover is measured with the temperature sensor and the sample temperature with the temperature sensor.
    • 本发明涉及一种用于通过测量在点火之后在测量室中获得的压力来确定要测试的液体或固体材料的闪点的装置和方法。 根据本发明,将液体或固体放入测量容器中,并且测量容器被加热。 测量容器用盖子紧密封闭。 在给定温度下,产生的蒸汽 - 空气混合物被点燃,并且由于温度升高而发生的压力增加被作为用于确定闪点的火焰尺寸的量度。 压力增加优选用压阻式压力传感器测量。 加热盖的温度用温度传感器和样品温度用温度传感器测量。