How do you check weight CO2 fire extinguisher?

Answer 1

CO2 extinguishers are weighed with any scale that can accurately read pounds and ounces (or kilograms if you're in an area using metric). There should be a weight stamped on the cylinder or on the label that states what the weight should be full, and if it weighs less than that labeled weight, it needs to be recharged. Note that this weight should not be confused with the "size" of extinguisher. For example, a "10 pound CO2 extinguisher" is so-called because it holds 10 pounds of CO2. It's actual weight will be higher, due to the weight of the cylinder, valve, hose, etc. So it's essential to compare the actual weight t what the label says it should weigh full.

Answer 2

I used to work for a fire extinguisher service. We would inspect fire extinguishers and attach updated inspection tags which are required by law here. This is the process I was instructed to follow:

1. Check exterior of extinguisher for visible damage.
2. Check to ensure that pressure meter is in the green zone, not in the red zone.
3. Strike the meter with a finger to see if that causes the needle to move.
4. If no problems with 1-3, then issue new inspection tag.