Changing of alarm and control levels on analogue signals and controllers. 改变模拟信号和控制器的警报及控制水平。
However, the level of control depends on the intended use and determines whether or not it should be calibrated or validated. 但是，对这些监视和测量装置的控制水平取决于它的意向用途和是否需要加以校准或确认来确定的。
