SPECIFICATION SHEET Thin, Responsive Heater Sets Standards for Performance and Durability The MI strip heater is a thin, responsive heater that uses the most advanced heater construction techniques. A nickel-chromium element wire is embedded in Watlow's exclusive mineral insulation material, which has a much higher thermal conductivity than the mica and hard ceramic insulators used in conventional heaters. This thin layer of insulation brings the element wire closer to the heater sheath. The result is heat flows easily from the element wire to the sheath allowing the wire to run cooler than conventional heaters and increasing heater life. • UL® component recognition for most 240VAC or less designs (UL® File No. E52951) • Solder pins • Zinc die-casting equipment • High-temperature resins • Tank and platen heating • Packaging equipment • Semiconductor chamber heating Higher watt densities than any other strip heater • Provides faster heat up Exclusive mineral insulation • Combines dielectric strength and superior thermal conductivity • Transfers heat rapidly to the sheath 304 stainless steel sheath • Maintains the high compaction of mineral insulation • Produces a rigid heater Watlow® is a registered trademark of Watlow Electric Manufacturing Company. UL® is a registered trademark of Underwriter's Laboratories, Inc.

Calculating Watt Density Watt density is the amount of wattage per square inch of heated area. To determine watt density, divide the total wattage by the heated area. Watt Density = Wattage Heated Area To apply this equation, the heated area is the total contact surface of the heater less areas of no-heat found around terminals, mounting holes, etc. Heated Area = Total Contact Area - No-Heat Area To calculate the heated area: 1. Using the chart below, locate the no-heat factor corresponding to the type of heater being considered. 2. To use the formula below, insert the no-heat factors, length...

• 1, 11/2 and 2 in. (25, 38, 51 mm), tolerance ±1/32 Length Heated Length 7⁄8 in. 7⁄8 in. 1/8) (22.2± mm • 8 to(22.2 30 in. mm)(203 to 762 mm), tolerance ½ in. ½ in. 0.36 in. (9 mm) D, 2 Places Terminations (13 mm) (13 mm) • 1 in. (25 mm) wide—post terminals one-on-one 11/2 to 2 in. (38 to 51 mm)—post terminals 1½ in. 1½ in. two-on-one (38 mm) (38 mm) All Heated Length Heated Length Heated Length Heated Length Note: In most applications, mounting holes alone do not provide adequate clamping. A clamp bar should be used for each 4 in. (102 mm) of heater length. 10-24 Screw Thread 0.715 in. mm)...

Thermocouple Pocket AccessoriesCeramic Terminal Covers A thermocouple pocket welded to the back surface accepts a 0.063 in. (1.6 mm) diameter thermocouple. This option provides accurate temperature sensing and easy thermocouple replacement. Thermocouple not included. Ceramic terminal covers offer a convenient and economic method to insulate post terminals. They are sized for standard length posts with 10-24 screw thread size, supplied as an accessory item and shipped separately. Specify Z4918 and quantity. Parallel Terminals Part Numbers-Type 3 and 4 Width in. (mm) ® Denotes units with mounting...