What are the two operating features of heat sensing devices?

Heat sensing devices are designed to detect increases in temperature and respond accordingly. The primary operating features of these devices include the rate of rise in temperature, which allows them to sense rapid increases indicative of potential fire conditions, and a fixed temperature threshold that triggers an alarm or action when that specific temperature is reached.

The rate of rise feature is crucial for environment monitoring, as it can detect incipient fire situations before they become critical. The fixed temperature aspect ensures that the device will also activate under conditions of excessive heat, providing a reliable fail-safe mechanism.

Understanding these two features is essential for maintaining safety in environments such as aircraft carriers where the presence of explosives and flammable materials necessitates stringent monitoring of temperature to prevent incidents.