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According to the manufacturers instructions.
We do not know what you mean by "PFD", please do not use abbreviations. But the answer would be when the instructions for the "PFD" say it needs to be replaced.
For the newer Inflatable PFDs, most manufactures will tell you when you should replace your cylinder, and most have an easily viewable inflator status. For instance - The Mustang Deluxe Automatic Inflatable PFD: Universal fit states: No inflator maintenance is require for 5 years unless the PFD has been inflated. You can easily view the inflator status and replacement date through the safety inspection window. Green indicates ready for use. However, each manufacturer can have different specification, so it's best to check with your manufacturer and for your specific vest type. For more information regarding the Inflatables, visit: The link below
For the newer Inflatable PFDs, most manufactures will tell you when you should replace your cylinder, and most have an easily viewable inflator status. For instance - The Mustang Deluxe Automatic Inflatable PFD: Universal fit states: No inflator maintenance is require for 5 years unless the PFD has been inflated. You can easily view the inflator status and replacement date through the safety inspection window. Green indicates ready for use. However, each manufacturer can have different specification, so it's best to check with your manufacturer and for your specific vest type. For more information regarding the Inflatables, visit: The link below
that is not a question It might be a co2 or compressed air container for the collapsible/inflatable spare tire that was available for the 69 firebird
You probably could fill it, but not to pressures needed for paintball gun operation, CO2 tanks should not be filled with any gas or liquid besides CO2. edit: you could use Argon in a HPA tank but not a CO2 tank
Whatever amount of pressure was used to compress the CO2 originally, can be reached (or nearly reached) when it is released into an air cylinder.
Normally it is done by weight. The empty cylinder weight is known and the weight with CO2 is taken and the CO2 weight is found.
You simply screw the CO2 into the back of the gun. Unless your CO2 should go elsewhere which is different to each gun.
It depends on the model, but most only need one.
the CO2 cartridges must be checked frequently and even moderatly drinking can lead to short term impairments(A+)
disconnect the attached wire and unscrew the sensor. there is a gel that should be applied to the sensor before you replace it.