Commonly used automatic tracking and定位 jet fire suppression systems (also known as "large space water cannons" or "smart water cannons") are installed in public venues with high foot traffic such as large shopping malls, conference halls, cinemas, stadiums, as well as transportation hubs like airports, train stations, bus stations, and docks, and in industrial sites like large warehouses and production workshops. These devices feature automatic control, remote manual control, and on-site manual control functions. Depending on their fire source detection methods, they can currently be categorized into red and ultraviolet detection positioning water cannons and video image detection systems. The following is an example of a video image detection system explanation:
Introduction to Video Image Detection
The ZDMS series automatic jet fire suppression devices feature a core component, the STM chip, produced by STMicroelectronics, the world's largest semiconductor manufacturer known for its stable performance. Signal processing utilizes advanced image analysis technology, while monitoring and communication are facilitated by an optical fiber transmission system, significantly reducing signal and image loss. A new, high-end video processor is employed to analyze flame characteristics, yielding a wealth of information such as color, shape, flicker frequency, sharp angles, and circularity from the video. Through comprehensive multi-characteristic judgment, the occurrence of false alarms is greatly reduced, providing all-around "no死角" fire source monitoring and detection. Moreover, video detection through image analysis can accurately locate the center point of the flame with relatively high positioning precision (note the distinction from conventional video surveillance).
One,
II. Product Features:
1) By analyzing the fire source and on-site construction installation, a comparison can be made with the following conventional aspects and red-ultraviolet detection:
a. In terms of tracking and positioning: During the positioning process, the direction of the cannon mouth changes along with the change in the fire source location, achieving true tracking and positioning; the red and ultraviolet water cannon's positioning method is a one-time positioning and cannot change with the variation of the fire source location.
b. In terms of positioning accuracy: The video detection system performs data analysis on captured images, transmits them to the microprocessing system, and achieves precise positioning with encoder positioning pulses. The red and ultraviolet detection fire suppression system also utilizes the ultraviolet sensor as a startup signal, analyzes the signal voltage detected by the infrared sensor for comparison, and drives positioning with a stepper motor. Although the positioning is accurate and the scanning time is short, the infrared detection components are sensitive to other light sources and external temperatures, which can easily lead to misjudgments, causing premature or inaccurate positioning. Therefore, the operating environment requirements are higher than those for video detection.
c. Regarding the impact of temperature on detection: With image detection, as the analysis is based on video images, there is no direct correlation with temperature, so it is not affected by temperature. The red and ultraviolet sensors perceive the spectral radiation of carbon dioxide during combustion, which is highly sensitive to temperature. Additionally, combined with other light sources and ambient temperature (such as summer), this can easily lead to false operations. Therefore, the advantages of image detection are apparent.
d. Installation Requirements: In terms of installation, the specialized camera for image detection and the high-end video processing system require only basic safety measures such as waterproofing, lightning protection, and dustproofing. Other environmental requirements are not stringent. For the red and ultraviolet water cannon, in addition to the above requirements, it should also be shielded from direct sunlight and high-frequency spark interference (such as welding) in a temperature-controlled environment. Therefore, the installation environment for the red and ultraviolet water cannon is more demanding than that for the image detection water cannon.
e. Regarding mirror-like reflections: The video water cannon can locate the actual fire source by comparing the characteristics of simulated and real fire. The red and ultraviolet system, based on the propagation characteristics of light, may misidentify the source as a mirror, glass, iron plate, or marble when these smooth objects are close to the cannon, rather than the actual fire source. Since modern building floors are typically very smooth, the red and ultraviolet water cannon's accuracy is greatly affected. Additionally, strong natural light and lightning can also significantly interfere with its performance.
f. Visual Features: The video detection utilizes a new high-end video processor "camera," which allows you to view the camera's coverage area through a monitor; installation and debugging are quite convenient. The red and ultraviolet detection system sensors can detect flame signals but are unable to see them. The protective area of the detector can only be judged based on the laser light and the naked eye, making installation and debugging relatively less convenient.
Section 3: On-Site Construction Installation and Precautions
The company, with years of experience in research and development, production, fine-tuning, and post-maintenance of equipment, now offers the following explanations and precautions for the installation of the intelligent water cannon:
Before installing the intelligent cannon, the water supply pipeline network should have completed the water pressure strength and tightness test, as well as the pipeline flushing.
b. The distance from the smart water cannon to the wall should not hinder the rotation of the cannon.
c. The short upright pipes should be securely fastened, and a sway-proof bracket should be installed 10 cm above the inlet flange of the intelligent water cannon.
d. Solenoid valves (for low flow smart water cannons), electric valves (for high flow smart water cannons), flow indicators, and gate valves should be installed horizontally.
e. There should be no obstructions within the detection range of the smart water cannon that could affect its movement and operation.
f. The on-site manual control panel for the smart water cannon should be installed in a convenient location for operation. During the process of operating the manual control panel, the operational direction and stopping position of the water cannon should be clearly visible.
g. The connection cables for the smart water cannon should be clearly designated as bundle cut lines. Our company provides dedicated cables between the smart water cannon and the on-site control box. This facilitates avoiding performance issues due to incorrect wiring on-site. Additionally, considering that the water cannon may tangle some cables during detection, the reserved cable length should be moderate.
Cautionary Notes:
1) The system should be powered by a single-phase power supply of 220V, 50Hz, and a voltage stabilizer (preferably an uninterruptible power supply) should be installed.
2) In locations with significant environmental interference, where standard video coaxial cables fail to meet requirements, fiber optic transmission should be employed.
3) Proper system grounding is a crucial measure to suppress interference. When unfamiliar system malfunctions or false fire alarms occur, the first consideration should be the integrity of the system grounding, which is a type of anti-interference grounding.
4) Do not connect the system grounding with the protective grounding or the power neutral line, otherwise it will cause permanent damage to the equipment within the system.
5) On-site construction should comply with design requirements, and the system's central control bus should be separated from the high-voltage power supply (i.e., strong power, weak power) to prevent malfunctions of the equipment due to wiring issues ("A good horse for a good saddle").
6) Provide guidance on the installation and wiring of smart water cannons based on the actual conditions and characteristics of the site. Installers should consider site factors and the installation features of the water cannon equipment to determine positioning, clearly define the routing of lines, elevation requirements, and wiring requirements at different locations, as well as the installation elevation and fixation method for equipment connections.
Installation requirements and precautions for the above equipment are detailed in the equipment installation manual or the specific installation plan for the targeted project!
IV. Performance Parameters:
