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1. 发明授权

US5182940A Flash point testing apparatus and method 失效
标题翻译：闪点测试仪和方法
公开(公告)号：US5182940A
公开(公告)日：1993-02-02
申请号：US778006
申请日：1991-10-17
申请人： Kenneth M. Bailey , Rex L. Mitchener , Timothy J. Wehking , Craig P. Reith
发明人： Kenneth M. Bailey , Rex L. Mitchener , Timothy J. Wehking , Craig P. Reith
IPC分类号： G01N25/52 , G01N27/16
CPC分类号： G01N25/52 , G01N27/16
摘要： 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.
摘要翻译：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。

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