Engine Fire Protection Systems Flashcards
What are four types of engine fire detection systems?
Thermoswitch system, thermocouple system, thermistor type continuous loop system, pneumatic type continuous loop system
Which type of fire detection system operates on the principle of the rate of temperature rise
The thermocouple system
Why must the reference junction in a thermocouple fire detection system be thermal insulated
This is a rate of temperature rise system. The reference junction must be insulated so its temperature will not rise as quickly as that of the measuring junction if a fire should occur.
How do you check a thermocouple fire detection system for operation
Press the test switch this heats the thermal couple enough for it to close the sensitive relay which intern closes the slavery relay and activates the fire, warning, light, and bell
How is pneumatic type continuous loop fire detection system checked for operation?
When the test swhich is closed, low-voltage AC flows through the tube that encloses the sensitive element. This current heats the element enough for it to release sufficient gas to activate the alarm switch. 
