Pressure gauge of the common three detection methods

Pressure gauge detection method has a lot of kinds, common methods? 1, the appearance of the visual feel. Appearance inspection mainly depends on commissioner eyes, of course some terms check by hand movements. 2, zero error detection under the condition of environment, the interior wall and atmospheric pressure gauge, and placed according to the normal work, by visual observation. Zero error verification should be in before and after the verification of error of each. 3, verification of error of A. Pressure gauge verification value is to use standard and value for the method of direct comparison value of test pressure gauge. B。 Verification of error should be selected according to the numbered dividing line, vacuum gauge measurement limit of fixed-point selection according to the local atmospheric pressure by more than 90%. C。 Verification, starting from zero uniform pressure slowly until the first check point ( The standard of value for) Then read the value (of test pressure gauge 1/5 according to the index value for read) , with fingers and then the pressure gauge shell, and then read bai minus pressure gauge and value for record, tap before and after checked the pressure value and standard value is between the test point error value; So, in turn, in the selection of test point verification until the measurement limit, to cut off the pressure source ( Or vacuum source) , pressure after 3 min, then step-down test until zero point by point in turn, have positive and negative two pressure range of membrane ( ) Pressure gauges shall be plus or minus respectively two pressure range of the verification of error; D。 Pressure vacuum gauge vacuum part of the verification of error: maximum pressure measurement for ( 0. 3 - 2. 4) Mpa, hydrophobic empty when the pointer should point to the vacuum direction; Pressure measurement limit of 0. 15 mpa, vacuum part verification of two point error value; Pressure measurement limit of 0. Part 6 mpa, vacuum test three point error value; E. Vacuum gauge shall be carried out according to the local atmospheric pressure by more than 90% degree of hydrophobic empty pressure 3 min.