At what position is the pressure gauge needle of a fire extinguisher indicating normal pressure?
2 Answers
The pressure gauge needle of a fire extinguisher indicates normal pressure when it is in the green zone, with a pressure value approximately 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 can be hazardous, and the extinguisher should be sent to a specialized facility for inspection and repair. Below is a detailed introduction to fire extinguishers: 1. Introduction: A fire extinguisher is a portable firefighting tool. It contains chemicals designed to extinguish fires. Fire extinguishers are one of the common fire prevention facilities, stored in public places or areas prone to fires. Different types of fire extinguishers are filled with different components, each specifically designed for different fire causes. Care must be taken during use to avoid adverse effects and potential hazards. 2. Main Classifications: Fire extinguishers can be categorized by their mobility into portable and wheeled types; by the power source driving the extinguishing agent into stored-gas, stored-pressure, and chemical reaction types; and by the extinguishing agent they contain into foam, dry powder, halon, carbon dioxide, water, etc.
When checking the car fire extinguisher, I often notice that the needle on the small gauge indicates normal pressure when it's in the green zone. The green area is usually in the middle of the dial, just like a traffic light—green means it's safe to use. If the needle leans left into the red zone, it means the pressure is too low, and the extinguishing agent won't spray, which would be disastrous in case of a fire. If it leans right into the yellow zone, the pressure is too high, risking an explosion. My routine is to glance at the needle position during every car wash or maintenance to ensure it stays in the green safety zone. Car fire extinguishers are small, but they can save your vehicle in critical moments, like when the engine starts smoking—without it, you're done for. Don’t slack off; make it a habit to check every three months to avoid being caught off guard. Only with normal pressure can the extinguisher work efficiently, ensuring driving safety.
