The thermostat symbol represents which device?

The thermostat symbol represents which device?

• A. Smoke detector
• B. Thermostat
• C. Carbon monoxide detector
• D. Heat detector

Answer: (D)

In fire alarm diagrams, symbols are used to show what type of detection the device provides. A thermostat senses temperature, which is why it’s tied to heat-related sensing. In these diagrams, the symbol for a thermostat is used to designate a heat detector, because both respond to heat and serve as temperature-triggered safety devices. This distinguishes it from a smoke detector, which detects airborne particles of smoke, and a carbon monoxide detector, which detects CO gas. So the thermostat symbol represents a heat detector in this context.

In fire alarm diagrams, symbols are used to show what type of detection the device provides. A thermostat senses temperature, which is why it’s tied to heat-related sensing. In these diagrams, the symbol for a thermostat is used to designate a heat detector, because both respond to heat and serve as temperature-triggered safety devices. This distinguishes it from a smoke detector, which detects airborne particles of smoke, and a carbon monoxide detector, which detects CO gas. So the thermostat symbol represents a heat detector in this context.