How to correctly select the precision of the pressure gauge?

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 the instrument to solve for you: selecting precision generally there are two ways: 1, habits or precision grades of experience method in general pressure gauge and pressure gauge casing diameter size, pressure gauge casing diameter size of 40 and 60 mm gauge for 2 mm. Level 5, the size of the pressure gauge diameter is 100 mm and 150 mm gauges generally to 1. Level 6. As the general pressure gauge is working with more pressure gauge, pressure gauge accuracy is not high, so if you choose the pressure gauge diameter is basic determines the accuracy of pressure gauge. 2, the calculation method based on the pressure gauge measurement is allowed to big error values to calculate the pressure gauge should choose the accuracy grade of, can use the following formula to calculate: pressure gauge precision grade = permissible error value/measurement ceiling & amp; 次; 100% cases: a pressure gauge measurement limit is 10 mpa, measured by the permissible error is not greater than zero. 2 mpa, what is should choose precision pressure gauge? Solution: the pressure gauge precision grade = permissible error value/measurement ceiling & times; 100% = 0. 2/10× 100% = 2% answer: pressure gauge precision grade option 1. Level 6. 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.