Die and Former Heaters

Problem Solvers

Watlow Solutions To Common Heater Problems

ProblemHeater Solution Lead wires burn out prematurely. •Ensure that lead wires have adequate insulation ratings for thetemperature of the application. GGS leads are rated for 250°C (482°F) while MGT leads 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 that there isadequate space for air circulation between heater surface and lead wire.•Heater leads can self-heat and should be de-rated if amperage is at thelimit of the lead wire and there is significant bundling in an enclosed channel. ProblemHeater Solution Machine has GFI protection and Many mineral insulated heaters can pick up moisture if they are not trips on machine startup. treated with a moisture retardant. This moisture will easily be driven out of anunsealed heater as it heats without causing damage. Check the machine GFI to see if it is adjustable to a higher but industrial safe current leakage value setting to override until heaters dry out. This usually takes no more than a few minutes.If you know ahead of time that insulation resistance is low and nuisance GFItripping can occur, heaters may be baked or dried at 121°C (250°F) for two to three hours.Where GFIs are known to be required in advance, specify the Watlow EuroNorm or moisture resistant option at no additional cost. Note that Euro Norm construction refers to specifications required to pass the European standard EN-60204. 238