Linear heat detector TPTS (thermocable)

Термокабель с Подтверждением Температуры Срабатывания (ТПТС) позволяет исключить «врожденный» недостаток традиционного термокабеля – формирование ложной тревоги при механическом повреждении с коротким замыканием термокабеля. The confirmed temperature initiation linear heat detector (thermocable TPTS) allows to eliminate the "inherent" disadvantage of the traditional thermal cables - false alarm signal formation in case of mechanical damages of the thermal cable as a result of short circuit. Maximum probability of damages of the thermal cables followed by false alarm signal formation is noted in warehouses, parking lots, protected outdoor systems, etc. It is important to provide protection against false alarms during initiation the automatic fire extinguishing system. It is now possible to eliminate false alarms in case of the linear heat detector closing under normal conditions due to the new product of Protectowire - Confirmed Temperature Initiation (CTI) Linear Heat Detector (U.S. Patent No. 8096708).

Измерение температуры термопарыКонструкция мультикритериального термокабеля ТПТСВ

In CTI linear heat detector (thermocable) one more criteria is used - detection of temperature increasing corresponding to the threshold of the thermal cable initiation. Thermoelectric effect is used to realize the second criteria that allows to measure temperature at the point of the short-circuit wiring to confirm the "Fire" mode or to detect a short circuit. Accordingly, this linear heat detector is made of a twisted pair of metal spring-loaded wires in thermoplastic insulation, which softens at the initiation temperature, as in a traditional thermal cable, but the wires have different coatings - one from copper and another from constantan.

When the two wiring connections are exposed to different temperatures, potential difference of potentials occurs, corresponding to the temperature difference. By measuring the thermocouple voltage it is possible to determine temperature at the short circuit point.

Operation principle of TPTS. In standby mode the PIM-530D interface module controls current in the circuit consisting of the series-connected wires of the thermal cable located in the protected zone and the 10 kOhm termination resistor. In case of TPTS short circuit at any point the PIM-530D interface module detects it by changing resistance, as the traditional thermal cable. Then the thermocouple measurement mode of the short-circuited part of the thermal cable is automatically switched on. If the temperature is fixed below the set alarm threshold, which is 138°C in this example, the initiation temperature is not confirmed and the short-circuit of the thermal cable is determined followed by "Fault" signal formation, but not false alarm signal, as with a traditional thermal cable.

If the short-circuit of the thermal cable caused by heating of the thermal cable and the measured temperature is approximately equal to or higher than the set threshold for this type of thermal cable (in this example 138°C), the initiation temperature is confirmed and valid "Fire" signal is generated.

 

Интерфейсный модуль в режиме Короткое замыканиеИнтерфейсный модуль в режиме Пожар

In CTI linear heat detector (thermocable) one more criteria is used - detection of temperature increasing corresponding to the threshold of the thermal cable initiation. Thermoelectric effect is used to realize the second criteria that allows to measure temperature at the point of the short-circuit wiring to confirm the "Fire" mode or to detect a short circuit. Accordingly, this linear heat detector is made of a twisted pair of metal spring-loaded wires in thermoplastic insulation, which softens at the initiation temperature, as in a traditional thermal cable, but the wires have different coatings - one from copper and another from constantan.

When the two wiring connections are exposed to different temperatures, potential difference of potentials occurs, corresponding to the temperature difference. By measuring the thermocouple voltage it is possible to determine temperature at the short circuit point.

 

In CTI linear heat detector (thermocable) one more criteria is used - detection of temperature increasing corresponding to the threshold of the thermal cable initiation. Thermoelectric effect is used to realize the second criteria that allows to measure temperature at the point of the short-circuit wiring to confirm the "Fire" mode or to detect a short circuit. Accordingly, this linear heat detector is made of a twisted pair of metal spring-loaded wires in thermoplastic insulation, which softens at the initiation temperature, as in a traditional thermal cable, but the wires have different coatings - one from copper and another from constantan.

When the two wiring connections are exposed to different temperatures, potential difference of potentials occurs, corresponding to the temperature difference. By measuring the thermocouple voltage it is possible to determine temperature at the short circuit point.

Electromechanical characteristics of TPTS 

Resistance*: 0.925 Ohm/m

Operation voltage, max.: 42 VDC

Polarity: "+" conductor of copper color, "-" conductor of silvery color

Minimum bending radius: 64 mm

Outer diameter of cable: 4 mm

Weight: 3.4 kg/152 m

 

* - Electrical specifications are for twisted pair conductors