What is the principle of operation of the continuous-loop fire detector system sensor?
Core resistance material which prevents current flow at normal temperatures.
What is the purpose of the continuous loop test switch in the flight deck?
System Test
The integrity of the continuous-loop fire detection system may be tested by actuating a test switch in the flight deck that
switches one end of the sensing element loop from its control circuit to a test circuit built into the control unit, which simulates the sensing element resistance change due to fire
.
How does a continuous loop work?
Continuous-loop systems are versions of the thermal switch system. They are overheat systems, heat-sensitive units that
complete electrical circuits at a certain temperature
. … The Fenwal system uses a slender inconel tube packed with thermally sensitive eutectic salt and a nickel wire center conductor.
What is a fire detection loop?
Therefore a loop refers to
a pair of cables
. These cables are intended to carry signals and energy between each of the circuit boards that are inside the control panel, as well as in each of the devices in the different areas, that is, outside the control panel.
What are the two basic types of continuous loop fire detection system?
Most modern aircraft use a fire detection system called a continuous loop; of which the two main types are
electrical and pneumatic
.
What are the 4 major parts of a closed loop system?
In a tension control closed-loop system there are four primary elements:
the controller, the torque device (brake, clutch, or drive), the tension measurement device, and the measurement signal
.
What is open loop and closed loop?
The main difference between an open-loop system and a closed-loop system is that the
closed-loop system has the ability to self-correct while the open-loop system doesn't
. Consequently, closed-loop systems are often called feedback control systems while open-loop systems are also known as non-feedback controls.
What is the most common type of residential fire safety alarm system?
Single-station smoke alarm
is the most common type of residential fire alarm system. Includes both a smoke detection device and an audible alarm within a single unit, quickly alerting occupants when a fire occurs Millions have been installed in private dwellings and apartments.
What gases are used for pneumatic fire loop system?
When heated to its fire alarm temperature, a pneumatic element releases
hydrogen gas
from its titanium hydride core which trips the pressure switch in the responder unit and signals an alarm.
What are the requirements for overheat and fire protection system?
- No false warnings under any flight or ground condition.
- Rapid indication of a fire and accurate location of the fire.
- Accurate indication that a fire is out.
- Indication that a fire has re-ignited.
- Continuous indication for duration of a fire.
How does fire loop work?
The two wires inside of the loop are separated with an insulating material called a
thermistor
. The thermistor, which is a resistor, is temperature dependent. … But if the material starts to heat up, like what would happen if there were a fire in the wheel well, the thermistor's resistance starts to break down.
What are the two types of smoke detectors used in aviation?
Another type of fire system that is used on aircraft is smoke detectors. There are two types of smoke detection systems such as
light refraction type and ionization type
.
What is the function of a fire detection system?
Fire detection systems are designed
to discover fires early in their development when time will still be available for the safe evacuation of occupants
. Early detection also plays a significant role in protecting the safety of emergency response personnel.
What are examples of open loop systems?
- Electric bulb.
- TV remote control.
- Washing Machine.
- Volume on the stereo system.
- Clothes drier.
- Servo motor or stepper motor.
- Door lock systems.
- Coffee or tea making machine.
What are examples of closed loop systems?
- Thermostat Heater.
- Sunseeker solar system.
- Voltage stabilizer.
- Missile Launcher.
- Auto Engine.
- Inverter AC.
- Automatic toaster.
- Turbine Water Control System at power Station.
What are the two major types of control system?
- Open loop control systems (non-feedback control systems)
- Closed loop control systems (feedback control systems)
