2 pressure gauges. Level 5 and 1. The difference between level 6

The working principle of pressure gauge is a sensitive element (by table Bourdon tubes, bellows, bellows) Elastic deformation, the pressure deformation by the transformation of movement in table to Pointers, cause the hands to display the pressure. According to the JJG52 - 1999 general pressure gauge vacuum pressure gauge vacuum gauge verification regulation rules 'the maximum permissible error of the pressure gauge measurement limit multiplied by the pressure gauge levels of percentage ( 2. Level 5 is ceiling & times; 2. 5%, 1. Level 6 or ceiling & times; 1. 6%) Compared to 1. Level 6 precision is higher than 2. Level 5. 1. Level 6 on behalf of error for the full scale & plusmn; 1. 6%, so the error will be smaller. Selection of pressure gauge precision grade: general pressure gauge measuring accuracy level 1 respectively. 0 and 1. 6, 2. 5, 4. Level 0. According to the process to allow maximum absolute error and the selected instrument most cheng, calculate the instrument allows the maximum error of the reference, in the regulations of the state, the accuracy grade of determine the accuracy of the instrument. In general, chooses the precision instrument, measurement results are more accurate and reliable. But cannot think of chosen instrument accuracy is higher, the better, because the precision of the instrument in general, the more expensive, operation and maintenance, the more trouble.