Heater Catalog - Watlow

Tubular Heaters1"(25 mm)Minor FIREBAR Axis 1Single/Double-EndedHeatersBendingMajor Axis 1Major and Minor Axis Bending ParametersThe following illustrations detail the recommended major Note: Watlow does not recommend field bendingand minor Minor axis bend Axis parameters 3 for FIREBARFIREBAR major elements. Axis If the 2 element must be bent in theelements. These illustrations show the relationshipfield, please contact your Watlow representative forAbetween the type of bend and the location of heat and assistance.no-heat sections. See the next two pages for the15 common Unheated bend formations. R0.235"(5.9 mm)180° Minor Axis Heated Bend(25 mm)180° Major Axis Heated Bend1 in.Sheath length(25calculationmm)forinside radius to 1 inch (25 mm).Sheath length = A + B - 0.5 inch(13 mm). R = 1 /2 inch (13 mm)minimum.0.235 in.(5.9 mm)1"(25 mm)1" (25 mm) Min.2" (51 mm) Min.No-HeatSheath length calculation for insideradius to 1 in. (25 mm). Sheath length =2A + 0.375 in. (10 mm). R = 1 /2 in.(13 mm) minimum.90° Minor Axis Heated BendA1"0.235"(5.9 mm)1"Unheated1 in.(25(25mm)mm)AA1 in. (25 mm) Min.0.235"0.235" AR (5.91" mm) (25 mm)1" (25 mm) Min.0.235 (5.9 mm) in.No-Heat1" Min.(5.9 mm) 1" (25 mm) Min. R (25 mm)2 in. (51 mm) R Min.BUnheatedB2.5" (64 mm)Sheath length BMin. calculation for insideradius to 1.5 inches (51 mm).Sheath length = A + B - 0.5 inch(13 mm). R = 1 /2 inch (13 mm)minimum.0.235"(5.9 mm)BMinor Axis 2A1" (25 mm) Min.Unheated2.5" (64 mm)Min.RSheath length calculation forinside radius to 1.5 inches (38 mm).Sheath length = A + B - 1.75 inch1 in. (44 mm). R = 1 inch (25 mm)(25 mm) Min. minimum.R1 in.(25 mm)0.235 in.(5.9 mm)BA1 in. (25 mm) Min.ARNo-Heat1 in. (25 mm) Min.Sheath length calculation forinside radius to 1.5 in. (38 mm).Sheath length = 2A + 0.75 in. (19 mm).R = 1 in. (25 mm) minimum.90° Major Axis Heated BendNo-Heat2.5 in. (64 mm)Min.RB3.5 in. (89 mm)Min.No-HeatARB90° Minor Axis Un-Heated Bend1 in.No-Heat(25 mm) A0.235 in.(5.9 mm)1 in. (25 mm) Min.R1 in. (25 mm)Min.B180° Major Axis BendsFIREBAR SizeRadiusin. (mm) in. (mm) Arc Length1 5 /8 (15.9) 1 3 /4 (19.0) 3.1251 5 /8 (15.9) 1 (25.0) 3.9001 5 /8 (15.9) 1 1 /4 (32.0) 4.6201 5 /8 (15.9) 1 1 /2 (38.0) 5.6001 (25.0) 1 (25.0) 4.3351 (25.0) 1 1 /4 (32.0) 5.1211 (25.0) 1 1 /2 (38.0) 5.906102 WATLOW ®