How to check a fire extinguisher gauge
You should perform a quick fire extinguisher inspection at least per month, and one of the most important factors to check during this inspection is the pressure gauge. The gauge will tell you whether the unit is undercharged, overcharged, or within the operational zone. You want the needle to point within the green area for optimal use.
What is the fire extinguisher recharging process?
Here is what you can expect when your fire extinguisher is recharged. This is not a guide
for how to recharge a fire extinguisher, but an overview so that you can understand the
First, the extinguisher is completely depressurized and agent removed from the
The discharge valve is removed from the cylinder.
The siphon tube is removed from the valve and the valve stem and spring is
The technician cleans the valve, replaces the valve neck o-ring, and visually
inspects the unit internally and externally for signs of damage.
Once cleaned the valve is reassembled with a new valve stem installed to insure
proper seating and avoid future pressure loss.
The extinguishing agent (water, carbon dioxide, dry chemical, etc.) is refilled by
weight to the appropriate amount for the size of the unit and as specified in the
recharging instructions for that unit.
The unit is re-pressurized with the appropriate pressurizing gas and to the required
pressure for that unit as noted on the recharging instructions.
The technician completes a Leak Test to check for signs of leakage and reinstalls
the discharge nozzle or hose.
The extinguisher is weighed again to confirm that the total weight is within allowable
tolerances indicated by the manufacturer.
A new tamper seal is installed on the safety pin and a new recharge tag is attached
to the unit with each tag indicating the unit total weight and the identity of the
technician completing the work.
One of the simplest ways to help protect your home or business from incipient-stage fires
is to ensure your fire extinguishers are properly charged and maintained.