Heater Catalog - Watlow

Specialty HeatersCoil/Cable HeatersFormation OptionsCoil HeatersThe coil heater can be tight wound or open pitch.Lead Orientation Options for Coiled Cable HeatersClosed Coil without Distributed WattageWidthWidthWidth/8 in.mm)I.D.I.D.Tail SectionTail Section90°1/8 ± 1 /8 in.(3 ± 3 mm)1 ± 1 /8 in.(25 ± 3 mm)I.D.90°Closed Coil with Distributed WattageTail Section1 ± 1 /8 in.(25 ± 3 mm)Nom. 3 /8 in.(9.5 mm) O.D.Option 2CFlat SpiralOption 2COption 2AOption 2AWidthWidthWidth90°n. (6 mm) R3/8 ± 1 /8 in.(10 ± 3 mm)TailSectionI.D.I.D.TailWidth Section45°90°1 ± 1 /8 in.(25 ± 3 mm)1/4 in. (6 mm) R3/8 ± 1 /8 in.(10 ± 3 mm)TailSectionI.D.Flat, spiral formations are used to heat flat circular45°surfaces. This formation is often used in semiconductorand medical applications.TailWidthSection1 ± 1 /8 in.(25 ± 3 mm)I.D.Option 2BOption 2BI.D.90°Option 2Bption 2AWidthI.D. Tail SectionNom. 3 /8 in.(9.5 mm) O.D.Tail Section1/8 ± 1 /8 in.(3 ± 3 mm)90°1 ± 1 /8 in.(25 ± 3 mm)Tail SectionFlat Spiral with2A Type LeadOrientation1 ± 1 /8 in.(25 ± 3 mm)Option 2CFlat Spiral with 2CType Lead OrientationFlat Spiral Inside Diameter StandardsCable Diameter—in.Flat Spiral with2F Type LeadOrientationm) R3/8 ± 1 /8 in.(10 ± 3 mm)TailSectionI.D.I.D.TailSectionWidthWidthOption 2COption 2C90°1/4 in. (6 mm) R45°Option 2F1 ± 1 /8 in.(25 ± 3 mm)3/8 ± 1 /8 in.(10 ± 3 mm)TailSectionI.D.TailSectionWidthSpiral Inside Diameter—in.145°(1.0) 3 3 31 ± 1 /8 in.(25 ± 3 mm)1 /16(0.062)3 /32(0.094)1 /8(0.125)2Option 1 /2 2B (2.5) 35 /32(0.156)3 /16(0.188)5 /8 (0.625) 3 3 33 /4 (0.75) 3 3 3 37 /8 (0.875) 3 31 3 /16 (1.187) 31 1 /4 (1.25) 31 1 /2 (1.5) 3 3 32 (2.0) 33 (3.0) 3 3 3Note: Maximum outside diameter is 6 inches.WATLOW ®Option 2B469