Mica Band Heaters
A Mica core produces a thin, efficient heater. Heat from the precisely wound Nichrome element is quickly transferred to the working surface for fast heat-up and response. Mica provides excellent dielectric strength and heat transfer capability for long heater life. The mica core is encased in a continuous corrosion resistant sheath and formed. All full mica band heaters are designed with closed ends to protect against contamination. Maximum sheath temperature is 800 F°
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Terminations
Leads:
Fig. 1: Usual design for nozzle heating applications. 12″ leads are standard. |
 Fig. 6: Flexible armor cable is the best solution to lead abrasion problems. 12″ armor with 14″ overall length leads are standard. Specify alternate position. |
 Fig. 3: Single conductor metal braid over lead wire. Offers most practical solution to abrasion problem. 12″ braid with 14″ overall length leads are standard. |
 Fig. 7: Double conductor metal braid exiting from edge 180° from gap. |
 Fig. 4: Standard lead wires exiting 180° from gap. |
 Fig. 16: Double conductor metal braid over lead wires at same position as Fig. 5. 12″ braid with 14″ overall length leads are standard. Specify alternate position. |
 Fig. 5: Leads exit at right angle to sheath 5/8″ from gap. 12″ lead wire in 3″ long sleeving is standard. Specify alternate position. |
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| Screw Terminals: |
Special Features: |
 Fig. T1: Standard position under 2-1/2″ wide. |
 Fig. 12: Hinged Half-Band- convenient where two piece heaters are required. Shown with Fig. 8 mounting flange and T2 screw terminals. Available with any termination or mounting arrangement. |
 Fig. T2: Standard position over 2-1/2″wide. |
 Fig. 14: Half Band-eases installation in difficult situations. Shown with T1 Terminals and Fig. 10 by-pass straps. Available with any termination or mounting arrangement |
 Fig. T3: Standard with terminal box. |
 Fig. 15: Probe holes and cut-outs-specify location in degrees from center of gap and size or provide drawing. Often a larger gap (standard gap is 1/4″ – 1″) will serve the same purpose. |
 Fig. B1 (shown) B2, B3:10-32 thread requires 1/2″ clearance from cylinder. |
 Fig. 17:Splitcase-Allows heater to be opened one time for mounting. Available with any termination or mounting arrangement. |
Mounting Configurations
 Fig.9 Strap-made from a low expansion alloy to tighten around the whole circumference of the heater with 5/16 socket head bolt. Low Profile: H = 1/4″, 1/2″ wide (Supplied on 3″ I.D. and less). Standard Profile: H = 3/8″, 5/8″ wide (supplied on 3-1/8″ I.D. and larger). Also available with hose clamp or punch lock strap. |
 Fig. 10 By-Pass Strap-Supplied on less than 2″ wide with terminals or Figures 5, 6 or 16. |
Fig. 8
Mounting Flange-a secondary means for mounting where a built-in
method is preferred with with 5/16 socket head bolt. |
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Fig. 11
Wedge Mount-for applications where an extremely low profile is
required or where access is limited. Available with Figures 1,
3, 4, 5, 7 and 16 leads. |
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Fig. 18:
Low Profile Barrel Nut Assembly Welded to Sheath with 6-32
screw. |
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Fig. 19:
Standard Profile Barrel Nut Assembly Welded to Sheath with 10-32
screw. |
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Fig. 20:
1-1/4″ Wide Barrel Assembly Welded to Sheath with 5/16 – 18
socket head screw. |
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Fig. 21
Quick Release Assembly with Spring Loaded Screw Assembly
Welded to Sheath with 1/4 – 20 screw. |
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Plugs & Additional Features
Terminal Protection
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Terminal Box Cover: 2″ H x1-1/2″ W x 2″ L. Also available in a 2-1/4″ H x 2-1/16″ W x 4-1/2″ L terminal box for larger clearance to terminals.
Ceramic Terminal Cover: 7/8″ high x 3/4″ O.D. for 10-24 thread. (PC4379-2; PC4380-1) |
Plugs
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Fig. 7P: Plug can be attached to any lead configuration. |
European Style High Temperature Plug
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Fig. 110: Dimensions-3-1/2″ H x 1-5/16″ L x 2-15/16″ W
Fig. 115: Dimensions-1-3/8″ H x 3-7/16″ L x 1-7/8″ W
Fig. GQ8: Receptacle (PC4396-3) |
Additional Variations
• Three terminal or lead, dual voltage, three phase or ground
•Appliance pin terminals
• Full length fiberglass sleeving
• Rectangular or segment band heaters provide drawing
• Outside diameter design for internally heating cylinder
• Stainless steel or Monel sheath for use in corrosive atmosphere
• Metric Sizes
