How to choose the gauge precision grade?

Pressure gauge, English name: pressure the gauge) Refers to elastic element as the sensitive element, measure and instructions above environment pressure meter, the widespread application, it almost throughout all of the industrial process and research fields. How to choose the gauge precision grade? Below small make up to answer for you: general component is zero. 5, 1, 1. 5, 2, 2. Seven grade 5, 3, 4. Selection of precision grade: 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. When choosing precision pressure gauge? In order to prevent the precision of the pressure gauge and the error of the system ( In the measuring instrument using pressure correction, for example) , you need to take the approach of the reference error is less than calculated income series values. Pressure gauge the size of the actual error, not only related to the accuracy, but also with the size of the range of pressure gauge. Range at the same time, the higher precision ( The smaller the number) The smaller, and allowed error of pressure gauge. Precision of phase at the same time, the greater the range, the greater the error of pressure gauge. Pressure gauge accuracy grade is it permissible error of the dial scale value by it's percentage, its accuracy level the greater the number of permissible error of dial scale limit value is larger. The greater the range of pressure gauge, the same precision level gauge, it measured the pressure value of the absolute value, the greater the margin of error.