How do you think the fire extinguisher is expired?
The second paragraph (narrower) is the Green Zone, with the pointer in the area indicating normal pressure and normal use.
The third section of yellow area indicates that the dry powder in the fire extinguisher is too pressure and can spray dry powder. But there is danger of explosion and explosion. Such a state of the fire extinguisher, it is best to get regular fire equipment stores, re filling dry powder. Yellow box area is inflatable danger zone factory to fire extinguisher production or maintenance of household to, under normal circumstances, the regular manufacturers will charge in the Green Zone, if the pointer in the Yellow grid region said the pressure is too large, as stated above, there is some risk, but it does not mean that the use of no effect.
Fire extinguisher pressure gauge is divided into three sections: the first paragraph is red area, the pointer refers to the red zone, indicating that the fire extinguisher dry powder pressure is small, can not be ejected, has expired. At this time should go to the regular fire equipment store re filling dry powder.
