Simplex Heat Detector Head 4098-9733

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TrueAlarm heat sensors are self-restoring and provide rate compensated, fixed temperature sensing, selectable with or without rate-of-rise temperature sensing. Due to its small thermal mass, the sensor accurately and quickly measures the local temperature for analysis at the fire
alarm control panel.


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  • Rate-of-rise temperature detection is selectable at the control panel for either 15° F (8.3° C) or 20° F (11.1° C) per minute.
  • Fixed temperature sensing is independent of rate-of-rise sensing and programmable to operate at 135° F (57.2° C) or 155° F (68° C).
  • The 4098-9734 sensor provides an additional 190° F (88° C) set point. In a slow developing fire, the temperature may not increase rapidly enough to operate the rate-of-rise feature.
    However, an alarm will be initiated when the temperature reaches its rated fixed temperature setting.