1. Introduction to the principle of recoverable cable-type linear temperature fixed fire detector
The resistance value of NTC (negative temperature coefficient) thermally sensitive polymer materials will change with temperature, that is, the temperature increases and the resistance decreases.The change curve of NTC thermally sensitive materials is as follows:
According to this property of NTC thermally sensitive materials, temperature changes can be reflected by monitoring the change in resistance of NTC thermally sensitive materials. This characteristic of NTC material has been used to develop a recovery-type cable-type fixed temperature fire detector for detecting fires caused by excessive temperature.The so-called recovery means that the temperature sensing cable is within the safe temperature range (different from each manufacturer), and the temperature sensing cable will not be damaged after alarm, and the temperature sensing cable can be reused.
2. Introduction to the temperature sensing cable of Putaian recoverable cable type fixed temperature fire detector
JTW-LD-PTA302 and JTW-LD-PTA303 are recoverable cable-type fixed temperature fire detectors (four-core analog quantitative fixed temperature detectors) developed by Shenyang Putai'an Technology Co., Ltd., with independent intellectual property rights (invention patent number: ZL 200810011398.3, ZL200810228482.0)
The JTW-LD-PTA302 and JTW-LD-PTA303 temperature sensing cables are single multi-core structures (four wire cores + one straight-load wire), and the four wire cores are composed of flexible metal conductors coated with NTC thermal polymer materials.The heat of NTC thermally sensitive materials will cause changes in the resistance of the temperature-sensitive cable - that is, the temperature rises and the resistance drops.
This change is monitored by a microcomputer modulator, and an alarm signal is output when the preset alarm temperature is reached.This characteristic of the temperature sensing cable allows the system to have the fire detection capability of points and lines in the entire circuit. When the alarm is completed, the temperature sensing cable returns to normal when the on-site temperature drops. This type of temperature sensing cable can be reused.That is: when the analog cable-type temperature sensing detector temperature sensing cable emits an alarm signal, it is generated under normal conditions of its device. Unless the temperature at the work site is too high, At the same time, the temperature sensing cable is exposed to high temperature for too long. Otherwise, it can still return to normal working state after alarm.
3. Technical parameters of temperature sensing cable of Putaian recoverable cable type linear temperature fixed fire detector
4. Characteristics of the temperature sensing cable of Putaian recoverable cable type fixed temperature fire detector
(1) The temperature sensing cable adopts a four-core flexible structure, and its bending performance and compressive resistance are better than that of the rigid structure;
(2) The temperature sensing cable has continuous sensitivity, and the sensitivity of the temperature sensing cable is not affected by ambient temperature changes and use length, and does not require adjustment and compensation;
(3) The temperature sensing cable is within the safe temperature range and does not damage the temperature sensing cable after alarming, and can be reused;
(4) The temperature sensing cable has an inner shielding layer, which can be used in places with strong electromagnetic interference.
(5)The high-strength extrusion sheath of the temperature sensing cable has strong corrosion resistance and wear resistance.
(6)Thermal sensing cable is highly applicable and can be used in narrow, dangerous and harsh environments.
5. Comparison of the temperature sensing cable of Putaian recoverable cable type fixed temperature fire detector with other similar products
Most domestic temperature sensing cables use rigid metal conductors. The JTW-LD-PTA302 and JTW-LD-PTA303 temperature sensing cables of Shenyang Putai'an Technology Co., Ltd. are patented products and use flexible metal conductors. Compared with other temperature sensing cables, the following areSignificant advantagesThe
| Serial number | Comparison project | Putian temperature sensing cable | Other manufacturers |
| 1 | Cable features | Flexible cable | Rigid cable |
| 2 | Bending ability | Soft, OK | Rigid, poor |
| 3 | Resistance to squeeze | Very strong | Squeeze easily damage |
| 4 | Resilience | Alarm can be recovered | Recoverable in a small range |
| 5 | Torsion resistance | powerful | Easy to damage |
