To avoid overfilling a recovery cylinder past 80 percent, the most reliable method is to:

Giải thích

The reliable way to stay within the 80 percent limit is to place the cylinder on a refrigerant scale and monitor the net weight against the cylinder's rated capacity, because the limit is defined by weight. Shaking, feeling the hose temperature, or timing the fill cannot accurately measure the charge. A float device or scale with automatic shutoff adds further protection.