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Watlow MI Band Heaters

Watlow MI Band Heaters

Product Overview

The Watlow MI Band is a high performance heater. Its performance and name are derived from Watlow’s exclusive mineral insulation—a material that has much higher thermal conductivity than the mica and hard ceramic insulators used in conventional heaters.

Specifications

A thin layer of the “high” thermal conductive MI material is used to electrically insulate the element wire from the inside diameter of the heater sheath. A thicker, “low” thermal conductivity layer backs up the element wire, directing the heat inward towards the part that is being heated. The result is more efficient heat transfer ... a performance solution that lowers element wire temperatures and increases heater life.
Performance Capabilities
​
  • Heater operating temperatures to 1400°F (760°C)
  • Watt densities to 230 W/in2 (35.6 W/cm2) available on small diameter nozzle bands
  • ​Watt densities to 100 W/in2 (15.5 W/cm2) available on large diameter barrel bands
Applications
​​
  • Extruders
  • Blown film dies
  • Injection molding machines
  • ​Other cylinder heating applications

Features & Benefits

Operating temperatures to 1400°F (760°C)
Safely melts even the newest resins, like PeeK®, Teflon®, Ultem® and Zytel®

Higher watt densities than any other band heater
Faster heat-up and through-put to increase productivity

High thermal conductivity of MI
Eliminates thermal lag and temperature overshoot associated with ceramic knuckle heaters

Stainless steel cover
Resists contamination

Permanently attached clamp bars
Eliminates clamping straps, making installation easier
Watlow MI Band Heaters 11/2 inches (38 mm) wide or greater will have post terminals located next to the expansion joint. Leads may be located anywhere along the circumference except near the gap and at the expansion joint. Two sets of leads required. On one inch (25 mm) wide MI Band heaters, post terminals will be located 90 degrees from the expansion joint. Leads may be located anywhere along the circumference except near the gap and at the expansion joint. Two sets of leads required.

Type SLE
Two fiberglass lead wires exit a single tightly woven metal braid at right angle on the expandable construction verses two sets of leads. Minimum diameter capabilities is four inches (100 mm). Minimum width capabilities is 11/2 inches (38 mm).

High Temperature "Quick Disconnect" European Style Plugs
​They provide the simplest and safest way to apply power to band heaters. The combination of high temperature male and female quick disconnect plug assemblies eliminates all live exposed terminals and electrical wiring that can be a potential hazard to employees or machine. Maximum amps 15
at 240VÅ(ac), maximum volts 240.

High Temperature "Quick Disconnect" European Style Female Adaptors
Available as an accessory item that must be used in conjunction with high temperature “quick disconnect” European style plugs.

Heavy Duty Strain Relief
Recommended for applications where there is great stress or continued flexing of the leads. The strain relief is available on Type B, Type B—90 Degree and Type B—180 Degree leads only. Ceramic Terminal Cover: Ceramic covers, with openings for leads, are screwed on to post terminals, providing a convenient, economical insulator.

Metallic Terminal Box
Metallic terminal boxes are available from stock on 31/2 inches inside diameter x 11/2 inches wide (89 mm x 38 mm) or larger heaters. Terminal boxes, which attach directly to the heater, act as a safety feature by covering the terminals. Conduit may be attached to the box through 7/8 inch (22 mm) diameter holes in the ends of the box. Two piece heaters require two boxes. Oversized terminal boxes are available on heaters two inches (51 mm) and wider. Consult Proheat.

MI Band Heaters with Holes
Watlow MI Band heaters with holes are available on all widths except one inch wide. Consult Proheat for hole sizes and location restraints.

Outside Diameter Heater
​Two fiberglass insulated lead wires rated to 840oF (450oC) exit a metal braid 180 degrees opposite from gap. Type B outside diameter designed and constructed to mate with inside diameter of cylinders.

Clamping Variations

Tig Welded Barrel Nuts With Spring Loaded Clamping
Welded barrel nuts with spring loaded clamping are used during start-up to maintain a tight heater fit on large barrels.This clamping variation is standard for all Watlow MI Band Heaters that are greater than 14 inches (355 mm) in diameter and 11/2 inches (38 mm) or greater in width. Refer to MI Band Clamping Matrix Application Guide, on page 16 of the Watlow heaters catalog. For smaller diameter heaters, it is an option and must be
ordered separately.

Tig Welded Barrel Nuts
An ideal way to provide access for instrumentation is to specify an oversized gap between the heater ends. If the clamp bar screw interferes with the positioning of the instrumentation device, welded barrel nuts are recommended.

Low Profile Tig Welded Barrel Nuts
Low profile barrel nuts are available on all widths. Low profile barrel nuts have a
clearance of 0.406 inch (10 mm).

Low Profile Clamp Bars
Low profile clamp bars are available on both one (25 mm) and 11/2 inch (38 mm) wide heaters, for
wider widths consult factory. These bars are 1/4 inch (6 mm) diameter with an 8-32 screw.

Sealed MI Nozzle Heater
Hermetically sealed tube construction makes this heater contamination proof and an excellent choice for a longer life in impure environments.

Non-Stock Options
  • Leads greater than 12 inches (305 mm)
  • Extended tube length [three inch, (76.2 mm) standard]
  • 90° rotation Type B leads

Search by Part Number

I.D.
in. (mm)		 Width in. (mm) Construction Volts Watts Watt Density
W/in² (W/cm²)		 Termination Approx. Net Wt.
lbs (kg)		 Part Number
1 (25) 1 (25) 1 pc 120 150 92 (14.2) Type B,C,E, F or H 0.1 (0.05) MB1A1AN1
1 (25) 1 (25) 1 pc 120 100 61 (9.4) Type B,C,E, F or H 0.1 (0.05) MB1A1AN2
1 (25) 1 (25) 1 pc 120 200 122 (18.9) Type B,C,E, F or H 0.1 (0.05) MB1A1AN3
1 (25) 1 (25) 1 pc 240 200 122 (18.9) Type B,C,E, F or H 0.1 (0.05) MB1A1AN4
1 (25) 1 1/2 (38) 1 pc 240 300 106 (16.4) Type B,C,E, F or H 0.1 (0.05) MB1A1JN1
1 (25) 1 1/2 (38) 1 pc 120 300 106 (16.4) Type B,C,E, F or H 0.1 (0.05) MB1A1JN2
1 (25) 1 1/2 (38) 1 pc 240 200 70 (10.8) Type B,C,E, F or H 0.1 (0.05) MB1A1JN3
1 (25) 1 1/2 (38) 1 pc 120 200 70 (10.8) Type B,C,E, F or H 0.1 (0.05) MB1A1JN4
1 (25) 1 1/2 (38) 1 pc 240 400 141 (21.8) Type B,C,E, F or H 0.1 (0.05) MB1A1JN5
1 1/4 (32) 1 (25) 1 pc 240 250 104 (16.1) Type B,C,E, F or H 0.1 (0.05) MB1E1AN1
1 1/4 (32) 1 (25) 1 pc 120 250 104 (16.1) Type B,C,E, F or H 0.1 (0.05) MB1E1AN2
1 1/4 (32) 1 (25) 1 pc 240 300 124 (19.2) Type B,C,E, F or H 0.1 (0.05) MB1E1AN3
1 1/4 (32) 1 1/2 (38) 1 pc 240 350 87 (13.5) Type B,C,E, F or H 0.2 (0.09) MB1E1JN1
1 1/4 (32) 1 1/2 (38) 1 pc 120 350 87 (13.5) Type B,C,E, F or H 0.2 (0.09) MB1E1JN2
1 1/4 (32) 1 1/2 (38) 1 pc 240 450 112 (17.3) Type B,C,E, F or H 0.2 (0.09) MB1E1JN3
1 1/2 (38) 1 (25) 1 pc 240 300 93 (14.4) Type B,C,E, F or H 0.1 (0.05) MB1J1AN1
1 1/2 (38) 1 (25) 1 pc 120 300 93 (14.4) Type B,C,E, F or H 0.1 (0.05) MB1J1AN2
1 1/2 (38) 1 (25) 1 pc 240 200 62 (9.6) Type B,C,E, F or H 0.1 (0.05) MB1J1AN3
1 1/2 (38) 1 (25) 1 pc 120 200 62 (9.6) Type B,C,E, F or H 0.1 (0.05) MB1J1AN4
1 1/2 (38) 1 (25) 1 pc 240 400 125 (19.3) Type B,C,E, F or H 0.1 (0.05) MB1J1AN5
1 1/2 (38) 11/2 (38) 1 pc 120 300 62 (9.6) Type B,C,E, F or H 0.2 (0.09) MB1J1JN1
1 1/2 (38) 1 1/2 (38) 1 pc 240 450 87 (13.5) Type B,C,E, F or H 0.2 (0.09) MB1J1JN2
1 1/2 (38) 1 1/2 (38) 1 pc 240 300 62 (9.6) Type B,C,E, F or H 0.2 (0.09) MB1J1JN3
1 1/2 (38) 1 1/2 (38) 1 pc 240 600 116 (17.9) Type B,C,E, F or H 0.2 (0.09) MB1J1JN4
1 1/2 (38) 1 1/2 (38) 1 pc 240 300 62 (9.6) Post 0.2 (0.09) MB1J1JP4
1 1/2 (38) 1 1/2 (38) 1 pc 240 450 96 (14.8) Post 0.2 (0.09) MB1J1JP6
1 1/2 (38) 2 (51) 1 pc 240 450 57 (8.8) Type B,C,E, F or H 0.3 (0.14) MB1J2AN1
1 1/2 (38) 2 (51) 1 pc 240 300 42 (6.5) Type B,C,E, F or H 0.3 (0.14) MB1J2AN2
1 1/2 (38) 2 (51) 1 pc 240 900 125 (19.3) Type B,C,E, F or H 0.3 (0.14) MB1J2AN3
1 1/2 (38) 3 (76) 1 pc 240 500 45 (7.0) Type B,C,E, F or H 0.4 (0.18) MB1J3AN1
1 1/2 (38) 3 (76) 1 pc 240 350 31 (4.8) Type B,C,E, F or H 0.4 (0.18) MB1J3AN2
1 1/2 (38) 3 (76) 1 pc 240 1000 104 (16.1) Type B,C,E, F or H 0.4 (0.18) MB1J3AN3
1 3/4 (45) 1 3/8 (35) 1 pc 240 450 83 (12.9) "36 in. 90° Type B
braid w/HD strain
relief"		 0.2 (0.09) MB1N1GX3A
1 3/4 (45) 1 1/2 (38) 1 pc 240 300 47 (7.3) Type B,C,E, F or H 0.2 (0.09) MB1N1JN1
1 3/4 (45) 1 1/2 (38) 1 pc 120 300 50 (7.7) Type B,C,E, F or H 0.2 (0.09) MB1N1JN2
1 3/4 (45) 1 1/2 (38) 1 pc 240 700 110 (17.0) Type B,C,E, F or H 0.2 (0.09) MB1N1JN3
1 3/4 (45) 2 (51) 1 pc 240 750 86 (13.3) Type B,C,E, F or H 0.3 (0.14) MB1N2AN1
2 (51) 1 (25) 1 pc 240 350 73 (11.3) Type B,C,E, F or H 0.2 (0.09) MB2A1AN1
2 (51) 1 (25) 1 pc 120 350 73 (11.3) Type B,C,E, F or H 0.2 (0.09) MB2A1AN2
2 (51) 1 (25) 1 pc 240 450 94 (14.5) Type B,C,E, F or H 0.2 (0.09) MB2A1AN3
2 (51) 1 (25) 1 pc 240 350 73 (10.3) "36 in. 90° Type B
braid w/HD strain
relief		 0.2 (0.09) MB2A1AX6B
2 (51) 1 1/2 (38) 1 pc 240 400 53 (8.2) Type B,C,E, F or H 0.3 (0.14) MB2A1JN1
2 (51) 1 1/2 (38) 1 pc 240 1000 132 (20.4) Type B,C,E, F or H 0.3 (0.14) MB2A1JN2
2 (51) 2 (51) 1 pc 240 750 75 (11.6) Type B,C,E, F or H 0.4 (0.18) MB2A2AN1
2 (51) 2 (51) 1 pc 240 1200 125 (19.3) Type B,C,E, F or H 0.4 (0.18) MB2A2AN2
2 (51) 2 (51) 1 pc 240 750 75 (11.6) 36 in. 90° Type B
braid w/HD strain
relief		 0.2 (0.09) MB2A2AX2A
2 1/4 (57) 2 (51) 1 pc 240 750 63 (9.7) 120 in. 180° Type B
braid w/HD strain
relief		 0.2 (0.09) MB2E2AX7
2 1/4 (57) 2 1/2 (64) 1 pc 240 1000 72 (11.2) Type B,C,E, F or H 0.5 (0.23) MB2E2JN1
2 1/2 (64) 1 (25) 1 pc 240 400 63 (9.7) Type B,C,E, F or H 0.2 (0.09) MB2J1AN1
2 1/2 (64) 1 1/2 (38) 1 pc 240 500 50 (7.7) Type B,C,E, F or H 0.4 (0.18) MB2J1JN1
3 (76) 1 (25) 1 pc 240 400 54 (8.4) Post 0.3 (0.14) MB3A1AP1
3 (76) 1 1/2 (38) 1 pc 240 500 40 (6.2) Post 0.4 (0.18) MB3A1JP1
3 (76) 1 1/2 (38) 2 pc exp 230/460 525 53 (8.2) Post 0.4 (0.18) ME3A1JP10
3 1/2 (89) 2 (51) 1 pc 240 800 42 (6.5) Post 0.7 (0.32) MB3J2AP2
3 5/8 (92) 1 1/2 (38) 2 pc exp 230/460 650 51 (7.9) Post 0.5 (0.23) ME3L1JP5
4 (102) 1 (25) 1 pc 240 700 62 (9.6) Post 0.4 (0.18) MB4A1AP1
4 (102) 1 1/2 (38) 1 pc 240 800 48 (7.4) Post 0.6 (0.27) MB4A1JP2
4 (102) 1 1/2 (38) 2 pc exp 230/460 625 43 (6.7) Post 0.6 (0.27) ME4A1JP11
4 (102) 1 1/2 (38) 2 pc exp 230/460 725 50 (7.8) Post 0.6 (0.27) ME4A1JP12
4 1/2 (1 1 4) 2 1/2 (64) 1 pc 240 1250 40 (6.2) Post 1.0 (0.45) MB4J2JP1
5 (127) 1 1/2 (38) 2 pc exp 240/480 1000 52 (8.1) Post 0.8 (0.36) ME5A1JP8
5 1/4 (1 33) 1 1/2 (38) 2 pc exp 240/480 1000 48 (7.4) Post 0.8 (0.36) ME5E1JP1
5 1/4 (1 33) 1 1/2 (38) 2 pc exp 230/460 600 29 (4.5) Post 0.7 (0.32) ME5E1JP9
5 1/4 (1 33) 3 (76) 2 pc exp 230/460 1700 40 (6.2) Post 1.5 (0.68) ME5E3AP5
5 1/4 (1 33) 4 1/2 (114) 2 pc exp 230/460 2400 38 (5.9) Post 2.2 (1.00) ME5E4JP2
5 1/4 (1 33) 4 1/2 (114) 2 pc exp 230/460 2700 43 (6.6) Post 2.2 (1.00) ME5E4JP3
5 1/2 (1 40) 1 1/2 (38) 2 pc exp 240/480 1000 46 (7.1) Post 0.9 (0.40) ME5J1JP1
6 (1 52) 1 1/2 (38) 2 pc exp 240/480 1000 41 (6.4) Post 0.9 (0.40) ME6A1JP2
6 1/2 (1 65) 1 1/2 (38) 2 pc exp 240/480 1250 47 (7.3) Post 1.0 (0.45) ME6J1JP5
6 3/4 (171) 1 1/2 (38) 2 pc exp 230/460 815 29 (4.5) Post 0.9 (0.40) ME6N1JP6
6 3/4 (171) 1 1/2 (38) 2 pc exp 230/460 1000 36 (5.6) Post 0.9 (0.40) ME6N1JP7
6 3/4 (171) 4 (102) 2 pc exp 230/460 2600 35 (5.4) Post 2.5 (1.10) ME6N4AP2
6 3/4 (171) 5 (127) 2 pc exp 230/460 3700 40 (6.2) Post 3.2 (1.50) ME6N5AP3
6 3/4 (171) 6 (152) 2 pc exp 230/460 3750 33 (5.1) Post 3.8 (1.70) ME6N6AP5
7 (178) 1 1/2 (38) 2 pc exp 240/480 1250 43 (6.6) Post 1.1 (0.50) ME7A1JP4
7 1/2 (191) 1 1/2 (38) 2 pc exp 240/480 1500 47 (7.3) Post 1.1 (0.50) ME7J1JP4
7 5/8 (194) 3 (76) 2 pc exp 230/460 1800 28 (4.3) Post 2.2 (1.00) ME7L3AP1
8 (203) 1 1/2 (38) 2 pc exp 240/480 1250 37 (5.7) Post 1.2 (0.54) ME8A1JP4
9 (229) 1 1/2 (38) 2 pc exp 240/480 1500 39 (6.0) Post 1.4 (0.64) ME9A1JP1
9 1/2 (241) 3 (76) 2 pc exp 230/460 3000 37 (5.7) Post 2.6 (1.20) ME9J3AP2
11 1/4 (286) 3 (76) 2 pc exp 230/460 2400 24 (3.7) Post 3.2 (1.50) ME11E3AP2
11 1/4 (286) 5 (127) 2 pc exp 230/460 5100 31 (4.8) Post 5.2 (2.40) ME11E5AP1

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