Choice of diameter The gauge diameter of the pressure g […]
Choice of diameter
The gauge diameter of the pressure gauge refers to the diameter of the gauge shell, and commonly used specifications are 60mm, 100mm, 150mm, 200mm, 250mm and so on. Generally, according to the detection, the location of the instrument and the lighting conditions, the appropriate diameter of the meter should be selected so that it can be observed clearly. In long distances and dark places, it is suitable to use instruments with a diameter of more than 100mm.
When the measured pressure has a large variation range, the maximum and minimum working pressures may not meet the above requirements at the same time, the selection of the instrument range should first meet the maximum working pressure conditions. The standard series of pressure gauge measurement ranges are -0.1-0.06, 0.15; 0-1, 1.6, 2.5, 4, 6, 10X10" MPa (where n is a natural integer. It can be positive or negative).
Generally, when the measured pressure is relatively stable, the maximum working pressure should not exceed 2/3 of the full scale of the instrument;
When the measured pressure fluctuates greatly or the pulsating pressure is measured, the maximum working pressure should not exceed 1/2 of the full scale of the instrument;
In order to ensure measurement accuracy. The minimum working pressure should not be lower than 1/3 of the full scale;
Choice of Accuracy
The accuracy of the pressure detection instrument is mainly determined according to the maximum allowable error in production, that is, the basic error of the instrument is required to be less than the maximum allowable absolute error of the actual measured pressure. In addition, the principle of saving should be adhered to when selecting. As long as the measurement accuracy can meet the requirements of production, there is no need to pursue the use of high-precision instruments.