Agricu-tural spraying tank liquid level indicator - conveys pressure at bottom of tank to direct reading dial manometer from pressure sensitive cell

摘要

In the tractor drawn agricultural spraying tank, pressure at the base of the tank, to which the depth of the liquid is proportional, is conveyed to a direct reading dial manometer(7) from a pressure sensitive cell(5). The depth can also be indicated electrically in steps by application of a voltage (10) to a circuit containing a series of metal electrodes (8, 9) and lamps (13) in parallel. The aqueous fluid forms a conducting path when covering the electrodes causing the lamps to be illuminated. Another mechanism uses a similar series of lamps which are brought in contact with the electrical supply by stud contact arranged in pairs inside a pressure collapsible tube.