Pressure gauge measuring range and accuracy of choice

When selecting we in addition to the choice of the type, we need to choose a good range of pressure gauge range and accuracy of measurement. The determination of measuring range, in order to ensure the elastic component can work reliably within the scope of the safety of the elastic deformation, when selecting range, must according to the size of the measured pressure and the pressure change of speed, enough leeway, therefore, the upper limit of pressure gauge should be higher than the process of the possible maximum pressure value. According to & other; Chemical control design technical regulations & throughout; And stable in measuring the pressure, the maximum working pressure shall not exceed 2/3 of the upper limit value of the measurement; Measuring pulse pressure, the maximum working pressure shall not exceed the upper limit value of the measured 1/2; When measuring high pressure, the maximum working pressure shall not exceed 3/5 of the upper limit value of the measurement. General minimum values measured pressure shall be not less than 1/3 of the upper limit value of the instrument measurement. To ensure the instrument of a linear relationship between output and input quantity. According to the measured parameters of the maximum and the minimum calculated instrument on, after the floor, do not value directly as a instrument of measuring range. We when choosing instrument on the scale of limit, should be selected in the regulations of the state, the standard series. Chinese pressure gauge measuring range of the standard series are: - 0. 1 - 0. 6, 0. 15. 0 - 1, 1). 6, 2. 5,4,6,10X10' MPa（ Where n is integer nature. For the positive and negative) 。 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. The measurement range and precision of pressure gauge is we definitely need to deliberate choice, pressure gauge if choice have mishap will have very dangerous consequences.