DEVELOPMENT OF FIRE ALARM THERMOSTAT OTHER THAN MERCURY-IN-GLASS.
NAVAL RESEARCH LAB WASHINGTON D C
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It was desired to investigate all types of mechanical and electrical fire alarm thermostats, other than mercurial, that would retain advantages of the mercurial and, in addition, be inherently resistant to high-impact shock. Attention was concentrated on a differential control thermostat recently modified for fixed-temperature fire alarm applications. Preliminary shock tests disclosed the need for some shock protection. Various methods of shock mounting were considered and a simple shock mount was developed adequately to protect the themostat from high-impact shock. Tests show this shock-mounted thermostat may be used as alternate for the mercury-in-glass type provided the tolerance in operating point is increased to 5F and the integral low-temperature alarm feature is not required. Author