Application of UV sensor in spark detection of internal circuit boards of explosion-proof fire trucks

When an explosion-proof fire truck (vehicle) is used in an explosive hazardous place, every electrical and non-electrical component on the vehicle should be an explosion-proof component that does not generate dangerous factors such as high temperature and (static) electric sparks. When the explosion-proof fire truck is operating normally, the vehicle will not generate dangerous temperatures that can ignite an explosive environment. However, in a fault state or abnormal situation, such as insufficient cooling water, if timely detection and timely measures are not taken, dangerous temperatures may be generated, thereby detonating the surrounding explosive dangerous gases. At this time, an explosion-proof fire truck temperature monitoring station should be used. The circuit boards and monitoring equipment of the monitoring station may generate electric sparks. If they are not handled and used in an explosive hazardous environment, accidents may also occur, so it itself should also be an explosion-proof product.

A temperature monitoring station for explosion-proof fire trucks that can timely alarm or send out control signals for factors that can produce dangerous temperatures on explosion-proof fire trucks and is explosion-proof itself. The technical solution adopted is: a temperature monitoring station for explosion-proof fire trucks, including a monitoring display station, a cooling water pump, an ultraviolet detector, a temperature detector, a water level sensor and a solenoid valve, and the monitoring display station is provided with an explosion-proof alarm display light and an explosion-proof box. The explosion-proof box is provided with an intrinsically safe processing circuit and a control circuit, and the intrinsically safe processing circuit is connected to the control circuit. The control circuit is connected to the explosion-proof alarm display light, the cooling water pump, and the solenoid valve respectively through signal lines. The intrinsically safe processing circuit is connected to the ultraviolet detector, the temperature detector, and the water level sensor respectively through signal lines.

The explosion-proof fire truck temperature monitoring station, whose explosion-proof box isolates the circuit of the explosion-proof fire truck temperature monitoring station from the external explosive gas environment, will not cause danger even if part of the circuit generates electric sparks; the circuit of the temperature monitoring station adopts an intrinsically safe processing circuit, which limits the current and voltage of the ultraviolet detector, temperature detector and water level sensor, which cannot be placed in the explosion-proof box, so that they cannot generate electric sparks; when the ultraviolet detector detects that the wavelength of the electric spark reaches the limit value, the control circuit lights up the explosion-proof alarm indicator light, and the temperature detector monitors that the temperature of various parts of the explosion-proof fire truck reaches the limit value, which will light up the explosion-proof alarm indicator light; the water level sensor monitors the water level of the water tank. When the water level is too low, the control circuit will light up the explosion-proof alarm indicator light, and at the same time, the solenoid valve will open to let water in. When the water level is too high, the control circuit will light up the explosion-proof alarm indicator light to remind the firefighters to take corresponding measures; whether there is water circulation in the cooling system, it only needs to detect whether the circulating water pump is working. The control circuit can monitor whether the cooling water pump is faulty. If a fault occurs, the explosion-proof alarm indicator light will be lit to prompt the firefighters to take measures. The utility model monitors key parts of explosion-proof fire trucks, such as water jackets, exhaust pipes, cylinders, power take-offs, water levels, water pumps, exhaust ports, etc., on the premise that explosion-proof measures are taken by the utility model to avoid becoming a source of danger. Before factors that can detonate explosive gas appear, alarm signals are promptly sent out to prompt firefighters to take corresponding measures, thereby eliminating potential accidents and ensuring the safety of on-site personnel.

Finally, the editor recommends a UV . The UV photodiode SG01D-5LENS was introduced from abroad by Gongcai.com. SiC has unique characteristics. It can withstand high-intensity radiation, is almost insensitive to visible light, produces low dark current, has fast response speed and low noise. These characteristics make SiC an excellent material for semiconductor UV detectors in the visible blind zone. SiC detectors can operate at temperatures up to 170°C (338°F). The temperature coefficient of the signal (response rate) is also very low, < 0.1%/K. Due to the low noise (dark current of fA level), it can effectively detect extremely low UV radiation intensities. Please note that this device needs to be equipped with a corresponding amplifier.

The SiC photodiodes are available in seven different effective sensitive areas, from 0.06 mm2 to 36 mm2. The standard version is a broadband UVA-UVB-UVC. Four filter versions result in a tighter sensitivity range. All photodiodes have a sealed metal housing (TO type), a TO18 housing with a diameter of 5.5 mm or a TO5 housing with a diameter of 9.2 mm. Further options are 2 pins (1 insulated, 1 grounded) or 3 pins (2 insulated, 1 grounded).