Pengembangan Alat Uji Komposisi Massa pada Logam Paduan Biner Menggunakan Sensor Load Cell dan Sensor Jarak Tipe Laser

Abstract

The objective of this research is to develop and to test the prototype of equipment for testing the mass composition of a binary alloy metal. During testing, the alloy metal is placed inside the glass vessel filled with the liquid fluid, therefore the metal experiences a fluid pressure called as buoyancy. The mass composition of the alloy metal is determined based on the measurement of mass and volume of the alloy metal electronically. The mass of the alloy metal is measured using a load cell based electronic scale, while the volume of the alloy metal is indirectly determined based on the difference in fluid surface levels measured using a laser distance sensor before and after the alloy metal is dipped inside the fluid. The surface area of the glass vessel is always constant, therefore the volume of the fluid displacement which represents the volume of the alloy metal can be calculated using the standard volume formula. Three types of alloy metals with various compositions of Sn (70-80%) and Pb (15-30%) elements are used in this experiment. The experimental results show that the percentage differences in mass composition of the alloy metals measured using this equipment prototype are about  0,05% -11,76%.  The error percentage is bigger as the percentage composition of Sn element increases and the percentage composition of Pb element  decreases. This considerably error might be caused by the use of less precise laser distance sensor with thefinest detection of only about 1,01 mm in resolution.  A further research based on the use of more precise laser sensor with about 0.01 mm in resolution needs to be conducted to significantly  improve the quality measurement of the mass composition of the binary alloy metal.

Keywords:  binary alloy, laser distance sensor, load cell. mass composition