Where should the needle of the fire extinguisher pressure gauge point to indicate normal pressure?
3 Answers
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.
Having driven for so many years, I often encounter people asking about the needle position on fire extinguishers. In a normal state, the needle should steadily stop in the middle of the green zone, indicating the pressure is just right. The red zone means the pressure is either too low or too high, which could cause failure in emergencies; yellow may be a warning, but the green zone is the safe range. The pressure of car fire extinguishers can easily fluctuate in high-temperature environments, so I recommend checking the dashboard of the trunk's fire extinguisher monthly to ensure it can handle sudden fire incidents while driving. Additional maintenance tip: Avoid placing it in direct sunlight to prevent affecting the reading.
As someone with elderly and children at home, safety is my top concern. The needle on the fire extinguisher should normally be in the green zone, indicating proper pressure and usability. If it points to red, it's no longer usable and needs immediate replacement; the yellow zone also requires extra attention. I personally check the pressure gauge of the car fire extinguisher every quarter to ensure the needle stays firmly in the green zone, especially before long trips, just in case. Simply wipe the gauge surface with a damp cloth for cleaning.
