Where Should the Needle on a Fire Extinguisher's Pressure Gauge Point for Normal Operation?
2 Answers
The needle on a fire extinguisher's pressure gauge should point within the green zone for normal operation, with a pressure value typically between 1.2 to 1.5 MPa. When the needle points to the red section, it indicates insufficient pressure inside the cylinder, rendering the extinguisher unusable and necessitating replacement. If the needle points to the yellow section, it signifies excessive pressure, which poses a potential hazard, and the extinguisher should be sent to a specialized agency for inspection and repair. The pressure gauge is a critical indicator for determining whether a fire extinguisher is operational, so it should be regularly observed and inspected. Once a fire extinguisher has been discharged, even minimally, it must be refilled according to regulations by a professional maintenance department following the manufacturer's specified requirements and methods. Alterations to the type and quantity of extinguishing agent or the pressure of the propellant gas are strictly prohibited.
Look at the fire extinguisher pressure gauge; the needle pointing in the green zone indicates it's normal. I keep fire extinguishers both at home and in my car, and every time I check them, I first look at the dial. The green zone means the pressure is just right and ready for use. If the needle moves to the red zone, the pressure is too low to discharge; if it goes to the yellow zone, the pressure is too high and poses a risk. Safety first—it's best to check the needle position monthly. Regular maintenance is advised, otherwise, the fire extinguisher won't work in an emergency. Many people overlook this, and it's too late when a fire breaks out. When choosing a fire extinguisher, also pay attention to whether the pressure gauge design meets standards—generally, green is the standard normal position.
