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Fire det preven

QuestionAnswer
Describe the thermal switch system? A set of temperature sensitive switches wired in parallel to each other and in series with an indicator light. At a given temperature the switch will close completing the circuit to the indicator light.
Describe the thermocouple fire warning system? Thermocouples wired in series with each other monitor the rate of temperature rise compared to a reference junction.
Name 3 types of continuous loop fire detection systems? Fenwal and Kidde (thermistor type), Lingberg (pneumatic type).
Describe the fenwal system? A nickel wire center surrounded by a eutectic salt in an Inconel tube. A control unit supply low voltage as the tube heats up the resistance of the salt drops and current flows activating the alarm.
Describe the Kidde system? Two wires surrounded by a thermistor core in an Inconel tube. One wire attached to a control unit and one to ground, Temperature increases, resistance decreases the control unit monitors the drop in resistance and gives an indication.
Name the thermistor type continuous systems? Fenwal, Kidde.
Name the pneumatic type continuous systems? Lindberg, systron donner, Meggitt.
Describe the Lindberg system? A fixed volume device filled with helium as gas pressure increases a pressure diaphragm is operated that closes a contact that actuates the alarm.
Name the types of smoke detection systems? Light refraction (photoelectric), Ionization type.
Describe a light refraction smoke detection system? A photoelectric cell that detects light being refracted by smoke, which creates an electrical circuit and sets of a warning.
Describe the ionization type smoke detector? Generates an alarm signal by detecting a change in ion density.
Describe the flame detector system. Flame detectors detect radiation emissions from flames by infared and ultraviolet
Describe a carbon monoxide detector system? A tan colored disc change to grey or black when exposed to carbon monoxide.
Created by: g153511
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