DENSITY CONTROL DEVICE Russian patent published in 2015 - IPC G01N9/00 

FIELD: measurement equipment.

SUBSTANCE: density control device includes a metering tank with a cover plate, to which a pressure meter is connected, a bottom made in the form of a membrane separating the metering tank from a pneumatic chamber with a nozzle arranged in it, which is connected to atmosphere and connected through a throttle to a feed line. The metering tank with a piston and a spring inside is connected to a variable volume chamber; the control inlet of the variable volume chamber is connected to the nozzle of the first pneumatic valve and to the outlet of the pneumatic adder. The nozzle of the second pneumatic valve is connected to the metering tank and to the variable volume chamber. Nozzle chambers of pneumatic valves are connected to atmosphere, and control inlets of the first and the second valves are connected to the outlet of the first pneumatic toggle switch. The metering tank is connected to the nozzle of the third pneumatic valve and to the first inlet of the pneumatic adder, the second inlet of which is connected to the nozzle chamber of the third pneumatic valve, to the control chamber of which the outlet of the second pneumatic toggle switch is connected.

EFFECT: higher measurement accuracy.

1 dwg