good time to change gas bottle?

[john dory]

I notice the pressure inside my fire extinguisher has started to drop.i may be away from home all next week,so wondered if it would be wise to change it now.
I have the dual stage reg,from co2 art.

 

[Chris Jackson]

Hard to say for sure. With my cylinder and guage I still get several days (3 bps ish) use even once the main cylinder side shows empty so if you're just seeing a small reduction in pressure you may still be good for several weeks yet.

 

[john dory]

Ok thanks.
I think i'll change it anyway.