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Sensors 2017, 17(4), 851; doi:10.3390/s17040851

Development of a New, High Sensitivity 2000 kg Mechanical Balance

Division of Mechanics and Acoustics, National Institute of Metrology, Beijing 100029, China
Academic Editors: Thierry Bosch, Aleksandar D. Rakić and Santiago Royo
Received: 21 February 2017 / Revised: 24 March 2017 / Accepted: 28 March 2017 / Published: 13 April 2017
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Abstract

Mass measurement of more than 500 kg on an electronic mass comparator has no better repeatability and linearity of measurement for meeting the calibration requirement of over class F1 weights from pharmacy and power generation plants. For this purpose, a new 2000 kg mechanical balance was developed by the National Institute of Metrology (NIM). The advantages of measurement of more than 500 kg on a new 2000 kg mechanical balance are introduced in the paper. In order to obtain high measurement uncertainty, four vertical forces of two sides of beam are measured and used as reference for adjustment of the beam position. Laser displacement sensors in the indication system are more effective for decreasing reading errors caused by human vision. To improve the repeatability and sensitivity of the equipment, a synchronous lifting control is designed for synchronously lifting the beam ends along the vertical direction. A counterweight selection system is developed to get any combination of weights in a limited space. The sensitivity of the new mechanical balance for 2000 kg is more than 1.7 parts in 10−4 rad/g. The extended uncertainties for the mechanical balance of 500 kg, 1000 kg and 2000 kg are 0.47 g, 1.8 g and 3.5 g respectively. View Full-Text
Keywords: sensitivity; mechanical balance; laser displacement sensor; repeatability; synchronous sensitivity; mechanical balance; laser displacement sensor; repeatability; synchronous
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Wang, J. Development of a New, High Sensitivity 2000 kg Mechanical Balance. Sensors 2017, 17, 851.

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