What Are the Different Types of Fire Alarm Cable?

The cable type linear temperature fire detector is a temperature sensing cable. The temperature sensing cable is generally composed of a microcomputer processor, a terminal box and a temperature sensing cable. The temperature sensing cable can be divided into 68 ° C, 85 ° C, and 105 ° C according to different alarm temperatures. , 138 , 180 (can be distinguished according to different colors) and so on.

Cable type linear constant temperature fire detector

This entry lacks an information bar . Supplementing related content makes the entry more complete and can be quickly upgraded. Hurry up!

The cable type linear temperature fire detector is a temperature sensing cable. The temperature sensing cable is generally composed of a microprocessor, a terminal box and a temperature sensing cable.

It can be divided into recoverable and non-recoverable according to different usage methods. Temperature-sensing cables (cable-type fixed-temperature fire detectors) can be widely used in power, steel, petrochemical, transportation, brewing, tobacco, mining, communications and other industries, power plants, steel plants, aluminum plants, coal preparation plants, power stations, Transformers, substations, oil depots, oil tanks, chemical storage tanks, metallurgy, switchboards, petrochemical plants, hangars, warehouses, large memorials, exhibition halls, ancient buildings, large shopping malls, airports, shipbuilding, hospitals, subways, etc., industrial and mining enterprises Fire detection and alarm for cable tunnels, cable shafts, cable trenches, cable trays, cable trunkings, cable mezzanines, transmission belts, electrical control equipment, large indoor and outdoor storage equipment, and explosive stacks.

The temperature-sensing cable of the non-recoverable constant-temperature fire detector is composed of two steel wires insulated with a heat-sensitive material. Its detection principle is that the cable detector is affected by

Recoverable fixed-temperature fire detectors are reusable temperature-sensing cables. According to the different signal processing methods, they can be divided into switching multi-level cable-type temperature detectors and analog cable-type temperature detectors.

Switching multi-level cable temperature detector

The structure of the switch multi-level cable temperature detector is three steel wires insulated with a heat-sensitive material. The detection principle is still that the resistivity of the heat-sensitive material decreases after heating, which triggers the temperature alarm of the switch. The difference is that the cable detector Two different materials with different thermal coefficients are used to insulate two steel wires respectively to achieve two-level alarms of the same temperature level or multi-level alarms of different temperature levels. The laying method adopts contact sine wave and surround laying, and it can also adopt hanging laying.

Analog cable temperature sensor

Analog cable-type temperature detector, the detection system is composed of analog cable-type temperature sensor and cable computer controller, analog cable-type temperature detection

Recoverable constant temperature fire detector

The cable structure of the device is four outer layers of conductors insulated by special negative temperature coefficient heat-sensitive materials, which are shorted into two loops. The cable computer controller is used to monitor the front end to detect the working status of the cable. The working principle of both is that when the temperature of the site protected by the temperature sensing cable changes, the resistance value of the monitoring circuit will change significantly.When the microcomputer controller detects that the resistance value of the front-end temperature sensing cable detection circuit changes to a predetermined value, When the alarm value is generated, an alarm signal will be generated and sent to the fire alarm control screen at the back end, thereby triggering the fire alarm signal. The input signal at the front end of the temperature-sensing cable microcomputer controller is a continuously changing resistance value (analog / analog quantity) generated by the temperature-sensing cable, and the output signal at the back end is a switching value (digital) signal. The laying method adopts contact laying or hanging laying. The analog cable-type temperature detector overcomes the shortcomings of ordinary 2-core temperature-sensing cables, and its reliability and practicability are greatly improved. Its advantages are:

(1) Non-destructive, because the analog cable temperature sensor sends a warning signal under the normal state of its device, unless the temperature at the work site is too high, and the temperature sensor is exposed to high temperature for a period of time. For a long time, otherwise it can resume normal working status after the alarm.

(2) Alarm temperature adjustable analog cable-type temperature detector The temperature point of the alarm cable can be dynamically set on the microcomputer controller according to the ambient temperature at the installation site, the length of the temperature cable, and the alarm temperature value. It can be used not only to monitor fire conditions, but also to monitor overheating conditions during equipment operation.

(3) The fault signal is complete. The alarm signal of the analog cable type temperature detector temperature sensor cable is obtained by the real-time monitoring and analysis of the resistance value of the field temperature cable detection circuit by its microcomputer controller. The conductor's physical short circuit or open circuit status is completely irrelevant, so no matter what causes the short circuit / open circuit of the cable detection line, the system will uniquely identify and report the corresponding fault signal.