FAULT SENSING INSTRUMENTATION

申请公布号：

US3661748(A)

申请号：

USD3661748

申请日期：

1970.04.07

申请公布日期：

1972.05.09

申请人：

INSTRUMENTATION LABORATORY INC.

发明人：

DAVID E. BLACKMER

分类号：

G01N27/416;G01N27/417;(IPC1-7):B01K3/00

主分类号：

G01N27/416

摘要：

An electrochemical sensor system includes an electrode assembly that produces a DC signal as a function of a parameter of interest sensed by the electrode system. An AC signal is applied via an electrode to the conductor fluid in which the electrode system is disposed and an AC signal detector is connected to the DC circuitry. A threshold circuit responsive to the output of the AC signal detector indicates fault in the electrochemical sensor system whenever the AC signal detector has an output of predetermined magnitude.