Moisture resistance seals, Applications, Bend formations – Watlow Electric Watrod Electric Tubular Heaters User Manual
Page 2: Watrod termination options
W A T R O D T U B U L A R H E A T 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
Studa
(Plate)
(Spade)
Lead Wires
Overmolds
Element
mm
inch
A
B
C
D
E
F
G
H
J