Why should grade 1.6 be used instead of grade 1.5 in the accuracy grade of pressure gauge?
The accuracy grade of the pressure gauge adopts R5 number system. In the past, 1.5 of the pressure gauge level did not belong to the R5 number system, so it must be abolished and replaced by 1.6, which is closest to 1.5. Therefore, it is no longer allowed to grade the pressure gauge to 1.5.
Why should 1.6 be used instead of 1.5 in the accuracy class of general pressure gauge?
It is necessary to understand the basic knowledge of priority number system in standardization technology. For the number system, the national standard gb/t321 specifies the "priority number system", which adopts the 1/n power of common ratio 10, which has the power of 1/5, 1/10, 1/20, 1/40 and 1/80 of 10, and the codes are R5, R10, R20, R40 and R80 respectively. The accuracy grade of the pressure gauge is R5 number system.
The common ratio of R5 number system is: 1/5 power of 10 = 1.60. Numbers in the number system include: 1.0, 1.6, 2.5, 4.0, 6.3 and 10. In the past, 1.5 of the pressure gauge level did not belong to the R5 number system, so it must be abolished and replaced by 1.6, which is closest to 1.5. Therefore, it is no longer allowed to grade the pressure gauge to 1.5.
The ratio of two adjacent numbers is equal to the common ratio of R5 number system 1.6. For example, 10/6.3=1.6, 6.3/4=1.6, 4/2.5=1.6, 2.5/1.6=1.6, 1.6/1 = 1.6, and you can continue down: 1/0.63=1.6, 0.63/0.4 = 1.6, 0.4/0.25=1.6, 0.25/0.16=1.6, 0.25/0.16=1.6.
Of course, if you do an inverse calculation, you can also derive the levels on both sides of an accuracy level after rounding. For example, for level 2.5, the higher level is 2.5 ÷ 1.6=1.6, and the lower level is 2.5 × 1.6 = level 4. For detailed knowledge about the number system, you can read the national standards.
What is the difference between pressure gauge accuracy class 1.6 and 1.5?
The accuracy grade of the pressure gauge refers to the percentage of the allowable error of the pressure gauge in the full range
For example, if the full range of a pressure gauge is 100MPa and its accuracy grade is 1.6, its allowable error is 100MPa × 1.6%=±1.6Mpa。 If the accuracy grade is 1.5, its allowable error is 100MPa × 1.5%=±1.5Mpa。
Under normal conditions of use, the accuracy of the measurement results of the instrument is called the accuracy of the instrument. The smaller the reference error is, the higher the accuracy of the instrument is. The reference error is related to the range of the instrument. Therefore, when using instruments with the same accuracy, the range is often compressed to reduce the measurement error. In industrial measurement, in order to express the quality of instruments conveniently, the accuracy grade is usually used to express the accuracy of instruments. The accuracy level is the maximum reference error minus the plus, minus and percent signs. Accuracy grade is one of the important indexes to measure the quality of instruments.
In industrial measurement, in order to express the quality of the instrument conveniently, the accuracy grade is usually used to express the accuracy of the instrument The accuracy level is the maximum reference error minus the plus, minus and percent signs. Accuracy grade is one of the important indexes to measure the quality of instruments.
