Heater Catalog - Watlow

High-Temperature HeatersCeramic Fiber HeatersPerformance Data (Continued)The following graphs provide technical data to helpevaluate performance and select the correct ceramic fiberheater for an application.The four graphs shown represent performance data forheat-up/cool-down rates and power requirementsSmall, Full Cylinder, Heated ChambersTest conditions for small, full-cylinder heated chambersare typical of analytical instrumentation furnaces. Severalstock sizes are represented. Units tested were 6 in.(150 mm) long, mounted in a vertical orientation. Bothends were capped with 1 in. (25 mm) of ceramic fiberto maintain furnace temperature. This data averagestest results performed for two typical types of furnacechambers, and should not be used for specificationpurposes.insulation. No additional insulation or metal sheathwas added to the outside diameter. Temperature wasmeasured by a thermocouple located in the geometriccenter of the chamber.Chamber Temperature—°F24002200200018001600140012001000800600400200Heat-Up and Cool-Down Rates—Small Full Cylinders1 3 /4 in. (44 mm) I.D. Full CylinderAverage of 6 Sizes3/4 in. (19 mm) I.D. Full Cylinder02 4 6 8 10 12 14 16 18 20 22 24 26Elapsed Time—Minutes12001000800600400200Chamber Temperature—°CPower RequirementsShown below are percentages of rated power neededto achieve and hold specific temperatures inside the fullcylinder chambers tested.This represents the efficiency of these heaters in thismounting configuration.Chamber Temperature—°F24002200200018001600140012001000800600400200Power Requirements to Hold Temperature—Small Full Cylinders1 3 /4 in. (44 mm) I.D. Full CylinderAverage of 6 Sizes3/4 in. (19 mm) I.D. Full Cylinder010 20 30 40 50 60 70 80 90 100Percent of Rated Power12001000800600400200Chamber Temperature—°CWATLOW ®437