Research of Improving Accuracy of the 3-ton Electric Balance for Gas Flow Measurement

摘要

There is a professional 3-ton electric balance for gas mass flow measurement in Chengdu Verification Branch for Natural Gas Flow of National Crude Oil Large Flow Rate Measurement Station. The weighting range of this balance is 0kg to 110kg, the minimum sensible mass is :1g, and the shift of indication value is no more than 2g (P=95%). It has been proved stable and reliable during its 8-year usage. This article brieves the method of improving the original circuit control system by applying advanced electrc technology. Using this method, the shift of indication value can been reduced to less than 2g and the balance can work even more stable. In addition, the author introduces an indirect weighting method to reduce the negative effect caused by the balance crossbeams and the hanging weights used after many years. Thus the accuracy of the electronic balance can be improved.