Barrel Heaters - Hasmak.com.tr

Hot RunnerNozzle <strong>Heaters</strong>Metric FIRERODCartridgeMaximum AllowableWatt DensityThe following four graphs detailmaximum allowable watt densitiesfor applications involving metalheating or steam, air and gasheating. Please review theserespective graphs and applicabledata to determine the correct wattdensity for your application.Heating MetalsThe Maximum Watt Density—Heating Metals graph will tell youeither the maximum hole fit orre<strong>com</strong>mended watt density of theheater. Enter the chart with eitherknown variable, part fit in holedimension or watt density. Then findthe application temperature byreading up or over on the chart.If the fit of the heater in the holedimension is not known, it is easilydetermined. Subtract the minimumdiameter of the metric FIREROD(nominal diameter minus tolerance)from the maximum hole diameter.For example, take a hole diameter of16.1 mm minus a heater diameter of16 mm - 0.08 mm. The hole fit wouldbe 0.18 mm. For metric FIRERODheaters in square holes or grooves,contact your Watlow sales engineeror authorized distributor for fit in holedimension.Correction Factors:Also note, the Maximum WattDensity—Heating Metals graphdepicts metric FIRERODs used insteel parts. Therefore, for eitherstainless steel or aluminum andbrass, refer to applicable correctionfactors ➀ and ➁ .2.5Maximum Watt Density—Heating Metals2.01.00.5Fit in Hole (mm)0.250.10400°C (750°F)500°C (932°F)300°C (572°F)100°C (212°F)200°C (392°F)800°C (1472°F)700°C (1292°F)600°C (1112°F)0.050➀ For stainless steel, enter the graph with afit 0.04 mm (0.0015 in.) larger than actual.➁ For aluminum and brass, enter the graphwith a temperature 55°C (100°F) aboveactual temperature.0.0101 2 3 4 5 6 7 8 9 10 20 30 40 50 60 7080 100Watt Density—W/cm 2104