Do not check the pressure or test the fire extinguisher by spraying it, even briefly. Once used it will gradually lose pressure and will not be fully charged for use in an emergency.
This extinguisher must be refilled only by an authorized fire equipment dealer. The extinguisher must be refilled with the same chemical that it contained when it was first purchased. Improper filling can result in non-working or dangerous units.
Inspect your extinguisher once a week. Remove your extinguisher from the bracket and inspect the gauge. If the gauge pointer is anywhere in the green band, the extinguisher is properly charged and ready to use.
Check for signs of damage or misuse. Make sure you can still read all of the text on the label. Carefully examine the surface of the extinguisher for corrosion. You can help prevent corrosion by cleaning your extinguisher on a regular basis or if it gets wet or dirty.
Make sure the safety seal (break away) is still in tact. Make sure the nozzle is clean and unobstructed.
To prevent extinguishing agent from becoming compacted, turn your extinguisher upside down then right side up several times to make sure agent is loose. This is very important with vehicle mounted extinguishers.
Record your inspection on the tag located on the extinguisher.
Report any damage or malfunctioning equipment immediately to your supervisor. Any equipment in need of repair must be replaced immediately. Equipment taken from service must be labeled "do not use", until repaired.