This is a requirement for transport category aircraft because such a short disables the fire detection system. The circuit shown in Figure 1 includes a test relay. The rugged wiring of the Fenwal AlarmLine provides a rapid response to the localized fire situations. This arrangement, called AND logic, results in greatly increased reliability against false fire warnings from any cause. HFC-227ea High-speed gas extinguishing system. Thermal Switch – Aviation Maintenance and Misc Manuals TM-General Aircraft Maintenance (General Maintenance and. A short may exist in either circuit without causing a false fire warning. If there is a fire, however, the hot junction heats more rapidly than the reference junction. The contacts of the sensitive relay are so fragile that they burn, or weld, if arcing is permitted. Units of the system are installed in locations where there are greater possibilities of a fire. Many older-model aircraft still operating have some type of thermal switch system or thermocouple system. At this point, an internal switch closes and reports an alarm to the cockpit. These variable resistance networks are monitored by the application of 28 volts direct current (DC) to the detector wire from the detector control unit. Used types of continuous-loop systems are the Kidde and the Fenwal systems. The duct fire which is hard to discover is detected promptly. Differential equation duct fire detection system. Class A zone—area of heavy airflow past regular arrangements of similarly shaped obstructions. This characteristic permits integration of all temperatures throughout the length of the installation rather than sensing only the highest local temperature. The normally open alarm switch closes upon an overheat or fire condition, causing a short circuit between terminals A and C. During normal operation, a resistance value is maintained across the terminals by a normally closed integrity switch. The resistance decreases more quickly with an electrical short than with a fire. A continuous-loop detector or sensing system permits more complete coverage of a fire hazard area than any of the spot-type temperature detectors. Most modern installations use the support tube concept of mounting sensing elements for better maintainability, as well as increased reliability. On some installations, all the thermal detectors are connected to one light; on others, there may be one thermal switch for each indicator light. Highly scalable and networkable detection and control systems for larger environments Kidde ORION XT is a powerful early warning detection system that distinguishes and actually counts individual particles of combustion, in most cases before there are smoke and flame. Smoke, Flame, and Carbon Monoxide Detection Systems, Extinguishing Agents and Portable Fire Extinguishers. It is an exclusive fault detection system for equipment composed of the smallest smoke detector F11 in the world and a control unit FC1. A fire detection system should signal the presence of a fire. Class X zone—area of heavy airflow and of unusual construction, making uniform distribution of the extinguishing agent very difficult. The control unit for the simplest type of system typically contains the necessary electronic resistance monitoring and alarm output circuits housed in a hermetically sealed aluminum case fitted with a mounting bracket and electrical connector. A unique sensing chamber design permits full 360 degree smoke entry and response. Temperature sensor. A maximum of 31 sets of detectors can be connected to one control unit to perform multi-point monitoring. Fenwal Controls of Japan which contributes to social safety and security with the thermal control technology. In the Kidde continuous-loop system, two wires are imbedded in an inconel tube filled with a thermistor core material. Do you need the locks changed on your business or home? Our installations have typically included computer and data processing centers, telephone communication rooms, and industrial and marine applications. The Fenwal system uses a slender Inconel tube packed with thermally sensitive eutectic salt and a nickel wire center conductor. Dust Cover Application This is a typical application of DETECT-A-FIRE units used as a release device to actuate a complete fire suppression system. For more sophisticated systems, control modules are employed that contain removable control cards with circuitry for individual hazard areas and/or unique functions. Fenwal Air Intelligence High Sensitivity Smoke Detector (HSSD®) ... which provides four levels of alarm, fault and three programmable inputs for interface with fire alarm panels and BMS systems. Fenwal Protection Systems (FPS) is a business unit of the North American division of United Technologies Fire & Security, a United Technologies Company. The duct fire which is hard to discover is detected promptly. 25. A comparison of the readings from each loop system also provides a check on the condition of the fire detection system, because the two loops should normally read alike. The fire/overheat detector’s sensor tube also contains a hydrogen-filled core material. The two wires encased within the thermistic material of each inconel tube form a variable resistance network between themselves, between the detector wire and the inconel tube, and between each adjacent incremental length of sensor. 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