VWR™ and VWR Signature™ heated and refrigerated circulators featuring enhanced electronics that allow intuitive, user-friendly programming and control. Redundant over-temperature and low liquid level detection safety has been relocated to the front of the control panel to permit easier access. Also, all refrigerated models now contain a purge port for bleeding inert gas, such as nitrogen, to form a blanket over the circulator's bath, greatly reducing or eliminating condensation. The circulators are available with four different controllers: analog, standard, digital, and programmable.