All vessels are individually pressure controlled using a unique resealing over-pressure guard (OPGuard™) vessel protection system. This system releases pressure vertically in a controlled manner to achieve safe pressure conditions. Released fumes are removed quickly to avoid condensation on cavity and vessels. If release is minor and drop in temperature is minimal, the digestion method can be continued. In an instance where pressure release is major, complete safety is achieved by automatically cutting off magnetron power, activating audible alarm, and displaying visual warnings