Ferrule Ball Valve

In the specified factors, the ability of the instrument to maintain certain properties unchanged over time is called stability (degree). Instrument stability is the chemical group instrumentation workers are very concerned about this performance indicator. Because the chemical industry group consumes the instrument the environment difference is worse, the measured medium temperature, pressure change also difference is big, in this kind of environment puts in the instrument to consume, the instrument some parts with the time to keep unchanged ability will be reduced, the instrument's stability will fall back. Favoritism or characterize the stability of the instrument is not yet a quantitative value, chemical groups usually use the instrument zero drift to measure the stability of the instrument. Zero drift is not seen in 1 year of operation.