公开(公告)号：US5698795A

公开(公告)日：1997-12-16

申请号：US624068

申请日：1996-03-29

申请人： John M. Elliott ,  Jeffrey P. Davies ,  Donald L. Beduhn

发明人： John M. Elliott ,  Jeffrey P. Davies ,  Donald L. Beduhn

IPC分类号： G01F1/704 ,  G01F1/708 ,  G01F1/68

CPC分类号： G01F1/7044 ,  G01F1/7084

摘要： The thermal time of flight signal guard overcomes the leakage crosstalk problem encountered in prior art systems by eliminating the leakage currents in the flow transducer before they reach the temperature sensors. This is accomplished by the installation of a conductive strip into the fluid flow path, interposed between the temperature sensors and the heat source. The conductive strip intercepts any errant leakage currents that are generated by the heat source and carried by moisture which accumulates on the walls of the fluid flow path to the temperature sensor. The signals that pass through the fluid flow conduit past the conductive strip to the temperature sensors are the thermal tracer signals. Therefore, the temperature sensors operate in a leakage current free environment and the signals produced by the temperature sensors are devoid of leakage current noise.

摘要翻译： 飞行时间信号保护器通过消除流量传感器到达温度传感器之前的泄漏电流来克服现有技术系统遇到的泄漏串扰问题。 这通过将导电带安装到介于温度传感器和热源之间的流体流动路径中来实现。 导电条拦截由热源产生并由积聚在温度传感器的流体流动路径的壁上的湿气携带的任何错误的泄漏电流。 通过流体导管通过导电条到温度传感器的信号是热示踪信号。 因此，温度传感器工作在无泄漏电流环境中，由温度传感器产生的信号没有泄漏电流噪声。