Used a counting instrument and limit witches, steel tubes make a counter that can be statistics the number of bags filled something on the conveyor belt.
Airborne particle counter (APC) is important instrument for air cleanliness certification in cleanroom. The main error of APC is coincidence loss.
光散射式尘埃粒子计数器是用来测量空气洁净度的重要仪器，粒子计数器的主要测量误差为重叠损失误差。
3
This text analyse lightning protection for instrument and meter of mine, expatiate on design idea, counter-measure, and daily maintenance and inspection routine for lightning protection of mine.