| 摘要 |
A method of testing the integrity of fusible glass bulbs of the type used as actuators in automatic sprinkler fire protection systems includes the steps of placing the bulb in a vacuum chamber, evacuating the chamber to a predetermined vacuum level at which the fluid within the bulb would vaporize, maintaining the predetermined vacuum level for a set period and then releasing the vacuum within the chamber. The bulb is removed from the chamber and visually inspected to determine if there has been a loss of fluid. The apparatus includes the vacuum chamber, a vacuum pump and a control system for connecting the pump to the chamber, maintaining the vacuum level within the chamber at a predetermined level and then releasing the vacuum.
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