Abstract: A flange and casing insulation testing instrument, comprising a means to apply a small voltage across a pair of insulated pipe flanges or between an insulated pipe and casing in an environment of earth and ground moisture to effect an electrolysis charging between the two components. First and second timers are provided to record the time period required to effect charging to a predetermined level to allow the establishment of a data base relating to the system being monitored. A microammeter provides an indication of the state of the insulation between the elements of the system, i.e. if the flanges or pipe and casing are shorted together, there will be no residual charge.

Abstract: Means forming a thermal protective barrier for inhibiting the transfer of energy between the environs and an open refrigerated compartment or bin during limited periods of inactivity has been provided by a pliant panel sufficiently extensive to cover the opening of the compartment. The panel is readily fastenable to an edge margin of the freezer compartment so that it can be draped across the open compartment. The panel comprises sections readily releasably secured together in sections to be easily removed for selective access to limited portions of the freezer compartment and for easy handling and storage of the sections. The closure panel is constructed whereby condensation accumulates on the exterior surface while a thermal barrier layer lies protected from condensate on the internal surface.