Barrel Heaters - Hasmak.com.tr

W A T L O W<strong>Barrel</strong> <strong>Heaters</strong>Special Mica BandVariationsContinued;;;;;;;;;;;;;;;;Holes and NotchesAn economical way to provideaccess for instrumentation is tospecify an oversize gap betweenthe heater ends. Holes and notchesin the sheath should be specifiedonly when all the cylinder surfacesadjacent to the hole or notch mustbe heated. When required, holesmay be provided in nearly anylocation as long as there is at least25 mm (1 in.) between the hole andone side of the heater. Standardhole sizes up to 51 mm (2 in.)diameter. For proper hole and/ornotch location, a dimensionaldrawing is required.Two Piece Band <strong>Heaters</strong>Two-piece construction is availableon heaters 76 mm (3 in.) or greater indiameter. <strong>Heaters</strong> three inches wideor less with post terminals have oneterminal on each end. <strong>Heaters</strong> overthree inches wide with post terminalshave the two terminals side by sideon one end. On two-piece units withleads, also specify the power supplyvoltage. The power supply voltage isthe voltage to which the heater will bewired. For example, a two-piece bandthat is 240VÅ(ac) per half may bewired in series to a 480VÅ(ac) powersupply. In this case the band heaterlead wire insulation must be rated for480VÅ(ac). To order, specify twopiece band heater, with volts andwatts per half and power supplyvoltage.Injection Molding<strong>Barrel</strong> <strong>Heaters</strong>Outside Diameter16 mm(0.625 in.)This variation is specially designedand constructed to heat the insidediameter of cylinders, i.e., largediameter blown film dies. All theterminations and mounting hardwareare located on the I.D. of the heater.Consult Watlow for available sizesand terminations. Option availableas standard mica construction only.To order, specify outside diameterheater.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.)46 mm(1.8125 in.)Metallic Terminal BoxTerminal boxes are attached to theheater to cover the terminals for anadded safety feature. Conduit maybe attached to the box through22 mm (0.875 in.) diameter holes inthe ends of the box. Terminal box isavailable on two piece heaters. Whenordering, specify terminal box.See page 30 forminimum/maximumdimensional requirements.31