DIFFERENTIAL MANOMETER WITH AUTOMATIC INDICATION OF SMALL AND FREQUENT DIFFERENCES IN PRESSURE BY WAY OF AN OPTICAL LEVER

摘要

1,274,682. Pressure gauges. FARBRICHE RIUNITE MISURATORI " SACCOFGAS " S.p.A. 12 June, 1969 [13 July, 1968], No. 29847/69. Heading G4H. [Also in Division G1] In a differential manometer having two vertically disposed tubes 2, 3, of different cross-section in which tube 3 can be fed with a low pressure gas through a pipe 6, tube 2 can be fed with a high pressure gas through a pipe 15, the height of the liquid in the tubes can be adjusted by a screw 5, and a float 8, positioned in the tube 2, is connected by a system of levers 9, 10 pivoted at 12, carries a mirror 11 which moves with alteration of the liquid level in the tube 2 to alter the position of the mirror 12 from which the light 18 from a fixed light source 7 is reflected on to one of a number of photo-cells 19 arranged in an arc struck from pivot 12, each connected to an indicating light 23.