How to choose the range of pressure gauge is correct?

To the use of pressure gauge and so on long enough, it is very important to the correct use of pressure gauge, using a pressure gauge is the most important is the range of pressure gauge, so how to choose the range of pressure gauge is correct? The following will introduce different case pressure gauge use pressure range is how much! 1, in order to ensure the safety of pressure gauge elastic deformation within the scope of work in a reliable way, the pressure gauge range selection according to the size of the measured pressure not only, but also measured the speed of pressure change, should consider the range should be enough leeway. Pressure gauge is used to measure the steady pressure, the maximum working pressure shall not exceed 2/3 of range; 2, pressure gauge is used to measure the pulse pressure, the maximum working pressure shall not exceed half of the range; 3, when the pressure gauge is used to measure the pressure, the maximum working pressure shall not exceed 3/5 of the range. To ensure measurement accuracy, the minimum working pressure should not be less than 1/3 of the range. According to this principle, according to the measured maximum pressure to calculate a numeric value, from the selection of pressure gauges product directory to slightly greater than the value of the measurement range. 4, in the daily operation according to the actual working pressure of 2 times come equipped with a pressure gauge. Such as work pressure of 0. 2 mpa, with 0. 4 mpa range of pressure gauge. This pointer in the middle of the dial position, vertical. Up of the pressure relief valve is to adjust according to the work pressure, pressure gauge is still have enough margin to cope with the overpressure indicators. From the above is the introduction of the range of pressure gauge with the right understanding?