Abstract
In this paper we present a hydraulic load cell made from hydroformed metallic bellows. The load cell was designed for a small kitchen appliance with the weighing function integrated into the composite control and protection of the appliance. It is a simple, low-cost solution with small dimensions and represents an alternative to the existing hydraulic load cells in industrial use. A good non-linearity and a small hysteresis were achieved. The influence of temperature leads to an error of 7.5%, which can be compensated for by software to meet the requirements of the target application.
Highlights
In this paper we present a hydraulic load cell made from hydroformed metallic bellows
The influence of temperature leads to an error of 7.5%, which can be compensated for by software to meet the requirements of the target application
Load cells or force sensors are the heart of a weighing instrument
Summary
Load cells or force sensors are the heart of a weighing instrument. They are, force transducers that convert a load or a force into an electrical signal. Typical representatives include strain-gauge-based load cells of various designs, i.e., bending beam, shear beam, S-beam, canister, ring, button and others They cover a typical sensing range from 0.1 N to over 106 N and their inaccuracy over the full scale (FS) is 0.003% to 1% [2,3]. In a rolling-diaphragm-type hydraulic load cell, a load or force acting on a loading head is transferred to a piston that, in turn, compresses a filling fluid confined within an elastomeric diaphragm chamber They cover the sensing range from 50 N up to 5 × 107 N and their inaccuracy over the full scale (FS) can be as low as 0.25% [2,3,4]. It has been implemented in a series of prototypes, the characteristics of which fulfill the requirements in such a manner that with some minor additional software corrections the desired functionality can be achieved
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