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W A T L O W

Plastics catalog - 7347 Barrel Heaters

dimensionaldrawing is required.

Special Mica Band

Variations

Continued An economical way to provideaccess for instrumentation is to specify an oversize gap between the heater ends. Holes and notchesin the sheath should be specifiedonly when all the cylinder surfaces adjacent to the hole or notch must be heated. When required, holesmay be provided in nearly any location as long as there is at least 25 mm (1 in.) between the hole and one side of the heater. Standardhole sizes up to 51 mm (2 in.)diameter. For proper hole and/ornotch location, a Å (ac). To order, specify Å (ac) per half may bewired in series to a 480V twopiece band heater, with Å volts (ac) powersupply. In this case the band heater lead wire insulation must be rated for 480V and watts per half and power supplyvoltage .
Injection Molding Two Piece Band Heaters
Barrel Heaters Two-piece construction is available on heaters 76 mm (3 in.) or greater in diameter. Heaters three inches wide or less with post terminals have one terminal on each end. Heaters overthree inches wide with post terminals have the two terminals side by side on one end. On two-piece units withleads, also specify the power supply voltage.The power supply voltage is the voltageto which the heater will bewired. For example, a two-piece band that is 240V Outside Diameter Holes and Notches This variation is specially designedand constructed to heat the inside diameter of cylinders, i.e., large diameter blown film dies. All the terminations and mounting hardware are located on theI.D. of the heater.Consult Watlow for available sizesand terminations. Option available as standard mica construction only. To order, specify outside diameter heater.
16 mm(0.625 in.) terminal box.Metallic Terminal Box
3.5 in. for 3.5-5.9375 in. I.D.4 in. for 6-39.9375 in. I.D. 37 mm(1.4375 in.) Terminal boxes are attached to the heater to cover the terminals for an added safety feature. Conduit may be attached to the box through 22 mm (0.875in.) diameter holes in the ends of the box. Terminal box is available on two piece heaters. When ordering, specify
46 mm(1.8125 in.) See page 30 forminimum/maximumdimensional requirements. 31