Watlow Electric Mica Strip Heater User Manual
Economical and
Reliable Source for
Industrial
Equipment
The Watlow mica strip heater is an economical and reliable
source of heat for industrial equipment. A mere 15 mils
(0.4 mm) thick mica insulator on both sides of the resistance
element provides complete electrical insulation and offers little
resistance to efficient heat flow. Plus mica withstands high voltage
spikes, resists moisture and is inert to most chemicals. UL
®
component recognition is available for applications to 900˚F
(480˚C) sheath temperature, file number E52951.
Performance Capabilities
• Sheath temperatures to 900˚F (480˚C) on zinc-coated units
• Sheath temperatures of 1200˚F (650˚C) on stainless steel units
• Watt densities to 55 W/in
2
(8.5 W/cm2)
• Maximum voltage 480VÅ(ac)
Applications
• Vulcanizing presses • Thermoforming
• Sealing equipment • Tin melting
• Hot plates • Packaging equipment
• Hot stamping • Food warming equipment
• Dies and molds
12001 Lackland Road
St. Louis, Missouri 63146 USA
Phone: (314) 878-4600
FAX: (314) 878-6814
Internet: www.watlow.com
e-mail: info@watlow.com
MICA STRIP HEATERS
Features and Benefits
Low mass construction
• Heats up fast to provide quick response to control input
Flat resistance ribbon
• Heat is generated over a broad area;this design solution
puts the heat source closer to the work
Rust-resistant, zinc-coated steel sheath
• Material gives the heater rigidity and improves emissivity
Optional stainless steel sheath
• Available for more corrosive atmosphere
Nickel-plated steel terminal posts
• Posts are securely riveted to ensure a positive,trouble-free
connection to the resistance circuit
Computer-aided design engineering
• Design combination of ribbon gauge, total wattage and
winding spacing maximizes heat transfer and life of the
heater
Excellent dielectric strength guaranteed
• All incoming mica receives a quality control inspection
FAX-1901-1100
UL®is a registered trademark of Underwriter’s Laboratories, Inc.
© 2001 Watlow Electric Manufacturing Company
Terminations
Types 1 through 6, as illustrated, show the placement of
terminals for Watlow mica strip heaters. However, please note
Type 3 ter minals are not available on stock units.Placement is
specified in terms of length, width and center-to-center
dimensions.These dimensions are as follows:
Length:
Min:Type 1, 2, 3: 2 inches (50.8 mm)
Min:Type 4, 5, 6: 5
1
⁄2 inches (139.7 mm)
Max: 96
a
inches (2438.4 mm)
Tolerance: ±
1
⁄16 inch (1.6 mm)
Width:
Min: Type1,2,4, 5:
5
⁄8 inches (15.8 mm)
Min:Type 3, 6: 1
1
⁄2 inches (38.1 mm)
Max: 15 inches (381 mm)
Tolerance: ±
1
⁄16 inch (1.6 mm)
Thickness:
Nominal:
3
⁄
16 inch (4.7 mm)
Types 4, 5 and 6 have
3
⁄8 inch x 1⁄4 inch (9.5 mm x 6.3 mm)
mounting slots. Letters A, B and C, called out in the
illustrations, denote the following:
A = width, B = overall length, and
C = center-to-center dimensions on mounting slots.
a
Consult the factory if you need to exceed 96 inches
(2438.4 mm).
MICA STRIP HEATERS
Type 1—Opposite Ends
Type 2—Tandem
Type 3—Parallel Made-to-Order
Type 4—Opposite Ends with Holes
Type 5—Tandem with Holes
Type 6—Parallel with Holes
Ordering Information
Please consult the Watlow Heaters catalog for specifics.
To order your stock mica heater, specify:
• Quantity
• Watlow code number
Av ailability
• Stock:Same day shipment
• Made-to-Order: If stock units do not meet application needs,
Watlow can manufacture mica strip heaters to meet special
requirements. Please consult a Watlow sales engineer or
authorized distributor.
B
A
5
"
/8
(15.9 mm)
Heated Area
5
"
/8
(15.9 mm)
B
A
B
5
"
/8
(15.9 mm)
Heated Area
B
C
A
3
"
/8
(9.5 mm)
A
5
"
/8
(15.9 mm)
Heated Area
B
C
3
"
1
/4
(44.5 mm)
Heated Area
3
"
/8
(9.5 mm)
A
1"
(25.4 mm)
3
"
1
/4
(44.5 mm)
Heated Area
3
1
/4
(44.5 mm)
B
C
3
"
1
/4
(44.5 mm)
Heated Area
"
(25.4 mm)
A
1"
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