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W AT R O D T U B U L A R H E AT E R S
Moisture Resistance Seals
WATRODs MgO insulating material is hygroscopic. To
prevent moisture contamination from entering the heater, an
appropriate moisture seal must be used. Choosing the correct
seal is important to the life and performance of the heater. Be
sure the maximum continuous use temperatures 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 arching at the terminal ends.
Applications
• Hot runner molds
Bend Formations
Single-Ended WATROD
Watlow does not recommend field bending single-ended
WATROD elements. The minimum radius of the bend and the
straight length beyond the bend limits formation. The radius
must be 76 mm (3 in.) or more for the heated length’s end to
be inside a bend.
Double-Ended WATROD
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.
The minimum bend radius and the straight length required
beyond the bend limits formation. In order to locate the end of
a heated length within a bend, the radius must be 76 mm
(3 in.) or larger. Additionally, overall length tolerances must
be included in one or more of the straight lengths.
WATROD Termination Options
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.
Standard flexible lead wires are 305 mm (12 in.) unless otherwise specified. Insulation options include TGGT (250°C/480°F) plus other
temperature ratings. Consult factory for availability. Overmolds are available for flexible lead wires only and are available in silicone
rubber (200°C/390°F), neoprene (90°C/212°F) and other materials. Consult your Watlow representative for details.
Double-Ended 6.6 0.260 #6-32 Yes Yes Yes Yes Yes Yes Yes Yes
8.0 0.315 #10-32 Yes Yes Yes Yes Yes Yes Yes Yes
8.5 0.335 #10-32 Yes Yes Yes Yes Yes Yes Yes No
9.5 0.375 #10-32 Yes Yes Yes Yes Yes Yes Yes No
10.9 0.430 #10-32 Yes Yes Yes Yes Yes Yes Yes Yes
12.0 0.475 #10-32 Yes Yes Yes Yes Yes Yes Yes Yes
12.4 0.490 #10-32 Yes Yes Yes Yes Yes Yes Yes No
15.9 0.625 #10-32 Yes Yes Yes Yes Yes Yes Yes No
Single-Ended 9.5 0.375 No No No No No No No Yes No
10.9 0.430 No No No No No No No Yes Yes
12.0 0.475 No No No No No No No Yes Yes
12.4 0.490 No No No No No No No Yes No
15.9 0.625 No No No No No No No Yes Yes
Sheath Threaded Screw Lug Quick Connect Flexible Lead Wire
WATROD Diameter Stud
a
(Plate) (Spade) Lead Wires Overmolds
Element mm inch A B C D E F G H J