Ultraviolet flame detector is the common name of ultraviolet flame detector. Ultraviolet flame detectors detect fires by detecting ultraviolet rays generated by the burning of substances. In addition to ultraviolet flame detectors, there are infrared flame detectors on the market, which are termed linear beam smoke detectors. Ultraviolet flame detectors are suitable for places that are prone to open flames when a fire occurs. Ultraviolet flame detectors can be used in places where there is strong flame radiation or no smoldering stage when a fire occurs. The flame detection ultraviolet sensor requires the sensor itself to withstand high temperature and high sensitivity.
The ultraviolet tube has two working states, one is the flameout protection of the furnace and the heater, the tube is always in the discharge state; the other is the fire alarm, and the tube works in the non-discharge state. The UV tube focuses on the detection of gas and liquid fuel flames, such as natural gas, coal gas, liquefied petroleum gas, gasoline, diesel, alcohol and other substances. Its flame visibility is low, it ignites quickly, and there is a danger of explosion. It must have flameout protection when burning. There is no ignition stage during fire forecasting. Ultraviolet detection has obvious advantages over other shapes of detection; it can quickly reflect within milliseconds; deep ultraviolet LED lamp manufacturers tell you that it can avoid the interference of visible light and infrared radiation on the furnace wall In the process of gradual fuel gasification in cities in our country, the program ignition control of boilers and heaters is more and more widely used. Because the ultraviolet radiation is transmitted at the speed of light, and the ultraviolet tube can quickly reflect in the millisecond level, it can be used in flammable and explosive places, and people and equipment are protected.
The basic function of the monitoring system is to monitor the combustion situation and respond to the flame interruption. Obviously, continuous monitoring is not economical. However, it is necessary to prevent serious accidents caused by thoughts of operating errors. If the flame goes out without being detected, fuel may continue to flow out and accumulate. If re-ignition is not paid attention to, it may cause an explosion of the accumulated fuel and air mixture, causing huge loss of people or equipment. Therefore, although the monitoring of the flame requires far-reaching education to monitor whether the flame is extinguished or not, a monitoring system is still needed to ensure safety. The monitoring response time is strictly required, and the fuel supply is generally detected within 2-4 seconds after the flame is extinguished.
Modern flame detection technology requires sensors with better characteristics. Some of them have been continuously improved. The use of bimetallic elements, bulbs, capillary systems, and thermocouples uses heat changes to determine the combustion situation. These methods can only be used when cold Respond; use the photosensitive element to detect the visible light in the burning, because the surrounding area is heated to the level of visible light, the detection response time is lagging, and it is also sensitive to some unexpected lights including lighting; although the infrared detector can avoid some accidents Visible light interference, but the heated furnace lining will radiate infrared rays and delay the reaction; two electrodes are set in the flame, and the flame’s conductivity is used for detection. This device cannot distinguish between the current conducted by the flame and the carbon deposit caused by combustion. The current conducted by dirt.
