How is the accuracy of monitoring and measurement equipment determined?
Under normal use conditions, the degree of accuracy of measurement results of the instrument called instrument accuracy. The reference error is smaller, the instrument accuracy is high, and the reference range of error and instrument, so the use of the same accuracy of the instrument, often take the compression range range, so as to reduce the measurement error. In industrial measurement, in order to facilitate the representation of instrument quality, usually with the degree of accuracy to represent the accuracy of instrument. The degree of accuracy is maximum error of the reference is removed, and a percent sign. The degree of accuracy is an important indicator of the quality of the instrument. The instrument rating industry in China is divided into seven grades 0.1,0.2,0.5,1.0,1.5,2.5,5.0, and sign in meter scale or on the nameplate. The accuracy of the instrument used is called precision, accuracy level of custom is called the accuracy.
Now the level of accuracy is very messy, in the chemical post with the same system measured pressure is not the same, to instrument workers brought great trouble. Level 1.5 has been changed to level 1.6 in the national standard for 09 years, but in fact it is not very different. The accuracy level is also related to the dial diameter, and the diameter 60mm is generally 1.6
The accuracy grade is divided by the percentage of its allowable error to the dial scale value, and the greater the accuracy grade, the greater the allowable error limit of the dial scale. The greater the range, the same accuracy level, it measured the absolute value of the pressure value, allowing the greater the error. Often used for the accuracy of 2.5, 1.5, and if 1 and 0.5 belong to high precision, and now some of the figures have reached 0.25.
