Fire Extinguisher Shell Linings

The integrity of shell linings in fire extinguishers can be tested using a high voltage unit applied to a carbon-coated brush electrode.

The circular brush passes through the neck of the extinguisher to make contact with the lining. Faults are detected by the voltage jumping from the electrode to the earthed shell, causing an alarm to sound. Special electrodes are available specifically for this application (see our data sheet E3).

A mains-powered DCCT unit is suitable if testing is incorporated into the manufacturing process, but a battery-powered PHD 1-20 can be used if greater mobility is required.