Self compensating fire detection device,申请号US19820378090-传众专利搜索

Self compensating fire detection device

申请公布号：US4513202(A)

申请号：US19820378090

申请日期：1982.05.14

申请公布日期：1985.04.23

申请人：

FIRETEK CORPORATION

发明人：CHOLIN, JOHN M.

分类号：G08B17/113;(IPC1-7):G08B17/10;H01J47/02

主分类号：G08B17/113

摘要：A device employing ionization principles for fire detection disclosing a configuration which allows compensation for adverse effects due to the flow of the gas through the device or due to the accumulation of dust and dirt therein. The detecting device includes two ionization chambers, each having a first member, such as a cylindrically shaped cup, having first and second conductive surface portions. Each chamber also includes a second member, such as a circular, electrode disc having two conductive surface portions. There is disposed in each chamber a radioactive source for ionizing the gas in the volumes intervening between respective pairs of surfaces. The area dimensions of the respective pairs of surfaces, the intervening volumes and the distances there between, and the relative orientation of the respective pairs are calculated and placed such that the ionization currents flowing between pairs of conductive surfaces are substantially equal and orthogonal to each other.