Interval price testing for industrial robots

2. Determination of measurement range

In order to ensure that the elastic element can work reliably within the safe range of elastic deformation, the pressure gauge measurement is selected

Pressure gauge (Figure 3)

During the process, sufficient margin must be left based on the magnitude of the measured pressure and the speed of pressure changes. Therefore, the upper limit value of the pressure gauge should be higher than the possible high pressure value in the production process. According to the "Technical Regulations for Chemical Automation Design", when measuring stable pressure, the high working pressure should not exceed 2/3 of the measurement upper limit value; When measuring pulsating pressure, the maximum working pressure should not exceed 1/2 of the upper measurement limit; When measuring high pressure, the working pressure should not exceed 3/5 of the measurement upper limit. The minimum value of the measured pressure should generally not be less than one-third of the upper limit value of the instrument measurement. Thus ensuring a linear relationship between the output and input of the instrument

After calculating the upper and lower limits of the instrument based on the maximum and minimum values of the measured parameter, these values cannot be directly used as the measurement range of the instrument. When selecting the upper limit value of the instrument scale, we should choose from the standard series specified by the country. The standard series of pressure gauge measurement range in China includes: -0.1-0.06, 0.15; 0-1, 1.6, 2.5, 4, 6, 10X10 "MPa (where n is a natural integer and can be positive or negative).

3. Selection of accuracy level

Calculate the allowable large reference error of the instrument based on the allowable large error of the production process and the selected instrument range, and comply with national regulations