Pressure-compensating device in load cells

Details Pressure-compensating device in load cells Pressure-compensating device in load cells

1983-06-28

1985-03-26

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to force

74 182, G01D 304, G01L 126

Patent

active

045065560

ABSTRACT:
Compensation for external and internal pressure variations in hermetically closed load cells is achieved using three parallel diaphragms vacuum-tightly attached between a force-transmitting member and a surrounding housing. An internal diaphragm is located adjacent the transducer space, a preferably equally large external diaphragm is located adjacent the atmospheric pressure, and an intermediate diaphragm is located therebetween, the intermediate diaphragm being considerably larger than the other two diaphragms. The space between the external diaphragm and the intermediate diaphragm is connected to the transducer space and the space between the internal diaphragm and the intermediate diaphragm is connected to the atmospheric pressure. Any difference between the pressure in the transducer space and the atmospheric pressure will cause forces with the same direction for the internal diaphragm and the external diaphragm but with the opposite direction for the intermediate diaphragm, and with a suitable area of the latter, therefore, an equilibrium of forces can be achieved independently of the pressure variations.

REFERENCES:
patent: 3097536 (1963-07-01), Young
patent: 3168826 (1965-02-01), Paetow

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