At what position of the pressure gauge needle is the pressure normal for a fire extinguisher?
2 Answers
The pressure of a fire extinguisher is normal when the needle of the pressure gauge is in the green zone. The pressure gauge of a fire extinguisher is divided into three sections: 1. Red zone: When the needle points to the red zone, it indicates that the dry powder pressure inside the extinguisher is too low to be discharged, rendering it ineffective. In this case, the dry powder should be refilled at a certified fire equipment store. 2. Green zone: When the needle points to this zone, it indicates normal pressure, and the extinguisher can be used normally. 3. Yellow zone: This indicates excessive dry powder pressure, which can discharge the powder but poses a risk of rupture or explosion. Methods to identify counterfeit fire extinguishers: 1. Weight verification: According to regulations, the total weight deviation for dry powder extinguishers below 3 kg should not exceed ±3%, and for those 3 kg or above, it should not exceed ±2%. 2. Appearance check: Portable fire extinguishers come with a pressure gauge, which typically has three color zones. 3. Date verification: A series of stamped numbers on the bottom of the dry powder extinguisher indicates the product's expiration date. If the date has passed, do not use the extinguisher. 4. Phone verification: The dry powder extinguisher is labeled with the manufacturer's contact information and fire product identity certification. Consumers can call the manufacturer directly to verify the information and authenticate the extinguisher.
I've been using fire extinguishers for years, and the needle on the pressure gauge must stay in the green zone to indicate normal pressure. Remember, the green zone is usually in the middle, and if the needle is within it, it means the extinguishing agent is ready to use at any time. If it drops into the red zone, whether to the left (low) or right (high), that's not right—it might not discharge when a fire breaks out, or worse, there could be a risk of explosion. I've experienced this myself—once during an inspection, the needle was leaning to the left, so I immediately had it recharged and repaired by a professional, eliminating a potential safety hazard. I recommend everyone learn this—don't just rely on luck. Check the pressure gauge every month, and don't let dust accumulate; it's about life and property! Also, fire extinguishers need to be replaced every few years—they have a limited shelf life, so don't skimp too much on safety. Safety first—don't underestimate the small things!
