Final answer:
Heat detectors are automatic alarm initiative devices that activate an alarm when the ambient temperature reaches a certain point.
Step-by-step explanation:
The type of automatic alarm initiative device that initiates an alarm when the ambient temperature near the detector reaches a predetermined point is a heat detector. Heat detectors are designed to detect rapid changes in temperature or when the temperature exceeds a certain threshold. They are commonly used in areas where smoke or other factors might trigger false alarms in other types of smoke detectors.
Learn more about Heat detectors in automatic alarm systems