Barrel Heaters - Hasmak.com.tr

<strong>Barrel</strong> <strong>Heaters</strong>Problem SolversWatlow Solutions To Common<strong>Barrel</strong> Heater ProblemsProblemHeater SolutionLead wires burn out prematurely. • Ensure that lead wires have adequate insulation ratings for the temperatureof the application. GGS leads are rated for 250°C (482°F) while MGTleads are rated at 450°C (232°F).• If thermal insulation is used, make sure to exit the leads away from thethermal insulation as close to the heater as possible.• If leads are touching the backside of heater, make sure there is adequatespace for air circulation between the heater surface and lead wire.• Heater leads can self-heat and should be derated if amperage is at thelimit of the lead wire and there is significant bundling in an enclosedchannel. Check the derating table below.Wire Ampacity Derating Based onAmbient TemperatureWire Insulation RatingAmbientAmbientTemp ˚C 250˚C 450˚C Temp. ˚F41-50 1.00 1.00 106-12251-60 1.00 1.00 124-14061-70 1.00 1.00 142-15071-80 1.00 1.00 160-17681-90 0.96 1.00 177-19491-100 0.94 1.00 195-212101-120 0.87 0.98 213-248121-140 0.79 0.95 249-284141-160 0.72 0.93 285-320161-180 0.54 0.90 321-356181-200 0.39 0.86 357-392201-225 ... 0.82 393-438226-250 ... 0.76 439-482251-275 ... 0.72 483-527276-300 ... 0.60 528-572301-325 ... 0.61 573-617326-350 ... 0.54 618-662351-375 ... 0.46 663-707376-400 ... 0.38 708-75260