According to JJG52-1999 "spring tube pressure gauge, pressure vacuum gauge and vacuum gauge calibration regulations", the cycle is half a year. Precision pressure gauge calibration cycle is up to one year. State regulations once every six months Not determined by the pressure gauge itself, determined by the nature of the project using the pressure gauge.
The interval between two calibrations is the calibration cycle of the pressure gauge. The calibration cycle can not be counted from the actual use of time. For example, according to the cycle of calibration, after the installation has not been used (6 months), need to use the time to re-test, qualified before starting to use.
Main classification
Pressure gauge according to its measurement accuracy: can be divided into precision pressure gauge, general pressure gauge. Precision pressure gauge measurement accuracy level were 0.1, 0.16, 0.25, 0.4 0.05 level; general pressure gauge measurement accuracy level were 1.0, 1.6, 2.5, 4. 0 level.
Pressure gauge according to its measurement benchmark: pressure gauge according to its indication of the pressure of different benchmarks,
Pressure gauge
divided into general pressure gauge, absolute pressure gauge stainless steel pressure gauge, differential pressure gauge. General pressure gauge to atmospheric pressure as a benchmark; absolute pressure gauge to absolute pressure zero as a benchmark; differential pressure gauge to measure the difference between the two measured pressure.
Pressure gauge according to its measurement range: divided into vacuum gauge, pressure vacuum gauge, micro-pressure gauge, low-pressure gauge, medium-pressure gauge and high-pressure gauge. Vacuum gauge is used to measure the pressure value less than atmospheric pressure; pressure vacuum gauge is used to measure the pressure value less than and greater than atmospheric pressure; micro-pressure gauge is used to measure the pressure value less than 60,000 Pa; low-pressure gauge is used to measure the pressure value of 0-6MPa; medium-pressure gauge is used to measure the pressure value of 10-60MPa;
Pressure gauges according to the way they are displayed: they are divided into pointer pressure gauges, digital pressure gauges.
Pressure gauge according to its function: pressure gauge according to its different functions can be divided into local indication type pressure gauge and with electrical signal control type pressure gauge.
General pressure gauge, vacuum pressure gauge, shock-resistant pressure gauge, stainless steel pressure gauge belongs to the local indication type pressure gauge, in addition to the indication of pressure without other control functions.
Source: Baidu Encyclopedia: Pressure Gauges