Where should the needle of the fire extinguisher pressure gauge point to indicate normal pressure?

[DelElizabeth]

The pressure of the fire extinguisher is normal when the pressure gauge needle is in the green zone. The normal pressure value of a fire extinguisher is approximately between 1.2-1.5 mpa. If the pressure gauge needle is in the red zone, it indicates insufficient pressure inside the cylinder, meaning the fire extinguisher cannot be used normally. If the needle is in the yellow zone, it indicates overpressure, which can be dangerous. Here is additional information: 1. Principle: Fire is a chemical combustion reaction, usually caused by the reaction between oxygen in the air and certain fuels such as wood or gasoline. Of course, wood and gasoline do not spontaneously combust simply by coming into contact with oxygen. The combustion reaction only occurs when the fuel is heated to the ignition temperature. 2. Function of fire extinguishers: The function of a fire extinguisher is to displace air, depriving the fire of oxygen and extinguishing it. Since carbon dioxide is a gas and leaves no residue, it is used for fire suppression to avoid damaging equipment.