| 摘要 |
<p>1,220,489. Detecting water content electrically; resistance testing. J. MULLER. March 1, 1968 [March 3, 1967; June 7, 1967; Sept. 29, 1967], No. 10139/68. Headings G1N and G1U. Apparatus for detecting water in e.g. fuel oil, comprises a filter for the liquid, which traps the water either in absorbent paper, or in capillory grooves, between a stack of conductive plates, the electrical resistance between alternate plates being tested to operate an alarm relay at a predetermined value. Several different forms of conductive plates are described. In order to develop the relay operating signal, the apparatus may be connected in the grid circuit of a pentode amplifier Fig. 16 (not shown) or the base circuit of a transistor amplifier Fig. 17 (not shown).</p> |
