Tubular Heaters
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Catalog excerpts

Tubular Heaters & Tubular Heaters

Tubular Heaters WATROD™ Single/Double-Ended Heaters Available in single- or double-ended termination styles, the versatile and economical WATROD™ tubular heating element from Watlow® lends itself to virtually the entire range of immersion and air heating applications. The single-ended WATROD tubular design has both terminals at one end. The opposite end is sealed. Flexible lead wires are 12 in. (305 mm) crimp connected to the terminal pin and have silicone-impregnated fiberglass oversleeves. The double-ended WATROD, with its round cross-sectional geometry, is highly adaptable for...

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WATROD Single/Double-Ended HeatersSpecifications Double-Ended Single-Ended Applications Watt Density Direct immersion Hot runner mold (manifold) Forced air Ovens Radiant Clamp-on Catalog P/N: Vacuums Semiconductor Platens Forced air Deicing antennas Plastic wrap cutting Seal bars Element Diameters in. (mm) and Surface Area per Linear in2 (cm2) Diameter Tolerance ± 0.005 in. (0.13 mm) Sheath Materials Sheath Length By Diameter Length Length Sheath No-Heat Length Length in. (13 mm) No-heat length on all blunt ends Volts Ampere

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WATROD Single/Double-Ended Heaters Specifications (Continued) Double-Ended Single-Ended Ohms Per Heated Inch Mounting Options Surface Finish Options Agency Recognition Threaded stud Screw lug (plate) Quick connect (spade) Flexible lead wires Standard: Silicone resin 221°F Ceramic-to-metal 482°F Silicone rubber (RTV) 392°F Silicone resin 392°F Epoxy resin 194/356°F Threaded bulkheads Mounting brackets Locator washers Oxide anneal Bright anneal Passivation UL® component to 480VAC (File # E52951/E56488) CSA component to 600VAC (File # 31388) Standard: Flexible lead wires Threaded bulkhead...

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Tubular H eatersWATROD Single/Double-Ended HeatersOptions Moisture Resistant Seals WATROD’s MgO insulating material is hygroscopic. To control the rate of moisture entering the heater, an appropriate moisture seal must be used. Choosing the correct seal is important to the life and performance of the heater. All materials have varying rates of gas vapor transmission. Be sure the maximum continuous use temperature is not exceeded at the seal location. Most end seals are applied with a small cavity in the end of the heater. The seal will also help prevent arcing at the terminal ends. External...

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Tubular Heaters WATROD Single/Double-Ended Heaters SE WATROD 5A Terminations Double-ended WATROD elements are available with a variety of terminations. Single-ended WATROD elements are available with only flexible lead wires. The following table and illustrations detail the terminations available with double- or single-ended WATRODs—for each available sheath diameter. WATROD Element Flexible lead wires are 12 in. (305 mm), Sil-A-Blend® 390°F (200°C) unless otherwise specified. Insulation options include TGGT 480°F (250°C) plus other temperature ratings. Contact your Watlow representative....

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Tubular HeatersWATROD Single/Double-Ended HeatersBend Formations Double-Ended WATROD Bend Formations Double-ended WATROD heating elements can be formed into spirals, compounds, multi-axis and multi-planes from 36 common bend configurations. Custom bending with tighter tolerances can be made to meet specific application needs. Formation is limited by the minimum bend radius (R) and the straight length (F) required beyond the bend. In order to locate the end of a heated length within a bend, the radius mustbe 3 in. (76 mm) or larger. Additionally, overall length tolerance (T) must be included...

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Tubular Heaters WATROD Single/Double-Ended Heaters Bend Formations (Continued) Figure 3 X = number of outside hairpins SL = 2A ++3.42R1 - 1.29 DIA + 2L SL = 2A 3.42 R-1.29 Dia. + 2L

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WATROD 1- 9 Tubular Heaters WATROD Single/Double-Ended Heaters Bend Formations (Continued) Figure 9 View A SL = 2K + 2B + 2A + 2L + 2.28R1 View A: + 1.14R2 - 1.72R3 - 6.15 Dia. SL = 2K + 2B + 2A + 2L + 2.28 R1 + View B: SL -1.72 + 2A + 2L + 2.28R1+ 1.14R2 1.14 R2 = 2K R3-6.15 DIA - 2.28R3 - 2.15 Dia. View B

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Tubular 1- 15 WATROD Heaters WATROD Single/Double-Ended Heaters Bend Formations (Continued) Figure 15 X = number of outside hairpins SL = 2A + 0.43 Dia. (1 - 2X) + 2L (X - 1) + 1.14R1 + 1.14R2 (X - 1) X = Number of Outside Hairpins X = Numbernumber of outside hairpins X = of Outside Hairpins SL = SL = 2K + 2A + 2K(X + 2B+- 2B - 0.86R3 2K + 2A + 2L(X - 1) - 1) 0.86 R3 0.86 R44+ 1.14 R11(X) + 1.14R22(X - 1) -0.86R + 1.14R (X) + 1.14 R (X - 1) 4.86 DIA - Dia. --(2X - 1) DIA Dia. 4.86 ( 2X 1)0.43 0.43 X = number of outside hairpins X = Number of Outside Hairpins SL = 2L + 2K + 2B + 2C (X - 1) -...

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Tubular Heaters WATROD Single/Double-Ended Heaters Bend Formations (Continued) WATROD 1- 20 X = number of outside hairpins SL = 2K + 2A + 2B + 2C + 2L (X - 1) + 1.14R1 (X) + 1.14R2 (X - 1) - 0.86R3 - 0.86R4 - 0.86R5 - 7.29 Dia. - (2X - 1) 0.43 Dia. X = Number of Outside Hairpins

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Tubular Heaters WATROD Single/Double-Ended Heaters Bend Formations (Continued) Figure 25

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Tubular Heaters WATROD Single/Double-Ended Heaters Bend Formations (Continued) Figure 31

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Tubular Heaters Figure 41 WATROD Single/Double-Ended Heaters Bend Formations (Continued) Figure 41

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Tubular Heaters WATROD Single/Double-Ended Heaters Bend Formations (Continued) Figure 47

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Tubular Heaters figure 54 WATROD Single/Double-Ended Heaters Bend Formations (Continued) figure 53 Figure 53

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Tubular Heaters WATROD Single/Double-Ended Heaters Mounting Methods Locator Washers A 0.065 in. (1.7 mm) thick stainless steel bracket provides element mounting in non-pressurized applications. Attached to the heater sheath, these brackets are not suited for liquid-tight mountings. The bracket is located 1/2 in. (13 mm) from the sheath’s end, unless otherwise specified. To order, specify mounting bracket. Single Leg Bracket 0.250 in. Hole + 3/4 in. (19 mm) A 11/2 in. (38 mm) x 1 in. (25 mm) wide x 16 gauge stainless steel bracket with one element hole and one mounting hole 1/2 in. (13 mm)...

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