Watlow Electric Electric Heater Electric Tubular Heaters User Manual

W AT R O D T U B U L A R H E AT E R S  
WATROD Tubular  
Heaters Provide  
Optimum Manifold  
Heating  
Available in single- or double-ended termination styles, the  
Features and Benefits  
versatile and economical WATROD tubular heating element  
Precision wound nickel-chromium resistance wire  
lends itself to efficient heating of hot runner manifolds. The  
• Distributes heat evenly to the sheath for optimum heater  
single-ended WATROD tubular design has both terminals at  
performance  
one end. The opposite end is sealed to resist contamination.  
Silicone resin seals  
Standard 305 mm (12 in.) flexible lead wires are crimp  
connected to the terminal pin and have silicone impregnated  
fiberglass oversleeves. With its round cross-section  
• Protect against moisture contamination and manifold  
leakage and are rated to 200°C (390°F)  
geometry, the double-ended WATROD is highly adaptable for  
bending – especially when bending is performed in the field.  
MgO insulation filled sheath  
• Maximizes dielectric strength, heat transfer and life  
Standard sheath materials include  
Both single- and double-ended WATRODs share many  
construction features that deliver long life—the resistance  
wire is centered in the heater sheath and electrically insulated  
with compact, high-grade magnesium oxide for superior  
manifold heating. Watlow’s double-sided multicoil tubular  
elements offer various combinations of resistor coils and  
thermocouples inside one sheath. They have the ability to  
sense the heater’s internal temperature accurately every time,  
or offer three-phase capability in one element.  
• Copper, steel 316 stainless steel and Inconel®  
• Optional materials, available on made-to-order, include  
304 stainless steel, Inconel®, Monel® and titanium  
36 standard bend formations  
• Allows for exacting fit to the manifold  
• Spirals, compound bends, multi-axis and multi-plane  
configurations  
Resistance wire fusion welded to the terminal pin  
• For a stronger, positive electrical connection  
Performance Capabilities  
Stainless steel studs  
Single-Ended WATROD  
• Fusion welded to terminal pins for mechanical strength  
with ceramic insulator  
2
2
Watt densities to 6.9 W/cm (45 W/in )  
UL® and CSA component recognition to 240V~(ac)  
Incoloy® and stainless steel sheath temperatures to  
650°C (1200°F)  
Double-Ended WATROD  
2
2
Watt densities to 18.6 W/cm (120 W/in )  
UL® and CSA component recognition to 480 and  
600V~(ac) respectively  
Inconel® sheath temperatures to 982°C (1800°F)  
HAN-WRD-1001  
Watlow Hannibal  
#6 Industrial Loop Drive  
P.O. Box 975  
Hannibal, MO 63401  
Phone: +1 (573) 221-2816  
Fax: +1 (573) 221-3723  
e-mail: info@watlow.com  
Watlow GmbH  
Lauchwasenstr. 1, Postfach 1165  
Kronau 76709 Germany  
Phone: +49 (0) 7253-9400-0  
FAX: +49 (0) 7253-9400 44  
e-mail: info@watlow.de  
Incoloy®, Inconel® and Monel® are registered trademarks of  
Special Metals Corporation (formerly Inco).  
UL® is a registered trademark of Underwriter’s Laboratories, Inc.  
© Watlow Electric Manufacturing Company, 2001  
 

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