canning
Unless you live at sea level please don't can in a pressure cooker UNLESS it is a canner.
Example: I had several conversations with Kuhn Rikon, because they kept telling me their pressure cooker heated to 15 psi. Something about what I was reading in the UK and US sites did not jive, however, so I asked them to please check with their engineering staff in Switzerland.
Good thing I asked. When the two bars on the Kuhn Rikon are just visible, the internal pressure is .8 bar, or just a bit under 12 psi (1 bar = 1 atmosphere). For COOKING there is NO difference; they claim, I think correctly, that most 15 psi COOKERS don't actually go to 15psi.
For canning at my altitude, however, I must have 13 psi for safety.
Had I accepted their assurance on their US site that "when 2 bars are visible it is 15 psi" I would have been heating the jars at too low of a temperature.
To be clear, at no time do they make any SIGNIFICANT claims about canning but report their cookers' characteristics and essentially tell you to make your own decision.
But it was at this point that I realized my All American 22 quart Pressure Canner is what should always be used for canning.
[this post was last edited: 3/20/2012-17:11]