The gas alarm is a gas leak detection alarm instrument. When the gas in the industrial environment leaks and the gas alarm detects that the gas concentration reaches the critical point set by the explosion or poisoning alarm, the gas alarm will send an alarm signal to remind the staff to take safety measures. The gas alarm is equivalent to automatic. Fire extinguishers and the like, can be installed to drive the exhaust, cut off, spray system to prevent explosions, fires, poisoning accidents, thus ensuring safe production. The gas alarm can measure various gas concentrations. It is often used in chemical plants, oil, gas stations, steel plants and other places where there is gas leakage.
Smoke alarms, a type of alarm, are common in life. The most commonly used smoke alarms in the world today are photoelectric smoke alarms and ionized smoke alarms.
The ion smoke alarm has an ionization chamber. The radioactive element used in the ion chamber is é•…241 (Am241), which is about 0.8 microcurie. It is in an equilibrium state of electric field under normal conditions. When there is smoke entering the ionization chamber, this balance will be destroyed. Relationship, the alarm circuit will issue an alarm when it detects that the concentration exceeds the set threshold.
There is an optical labyrinth in the photoelectric smoke alarm, which is equipped with an infrared pair tube. When the smoke is not smoked, the infrared receiving tube can not receive the infrared light emitted by the infrared emitting tube. When the smoke enters the optical labyrinth, the receiving tube receives the infrared through the refraction and reflection. Light, the intelligent alarm circuit determines whether the threshold is exceeded, and if an alarm is exceeded.
Auxiliary equipment. Welding installations consist of components designed to locate the workpiece in the position most convenient for welding, to turn the workpiece around during welding or during service operations in the weld zone, and to mount and transport the welding apparatus. Roller-conveyor, spindle, chain, pivot-type, and lever tilters are used to locate parts in a convenient welding position. Rotators with vertical, inclined, or horizontal axes of rotation are used to rotate the article being welded. Workpieces are fastened and turned using a disk chuck or a guide (for center rotators) or rollers (for roller-type rotators). Roller-type rotator stands are frequently used in welding cylindrical articles; the drive rollers of such rotators are usually rubber-coated. Shop and welding manipulators are used to turn workpieces around their axes in those cases where the spatial position of the axis is changed during welding. Overhead platforms, rail tracks, and special fixtures that grip the workpiece are used to mount and transport automatic and semiautomatic welders, to suspend the apparatus above moving workpieces, and to transport the apparatus along a weld seam or from weld to weld.
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