Cartridge Heaters

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Cartridge Heaters

Hot Rod Cartridge Heaters are designed to provide uniform heating and excellent heat transfer rate throughout the heating surface. Facilitated with individually controllable heating zones, various process requirements such as zone-specific heating and distributed wattage requirement can be achieved with precise and uniform temperatures.

Heaters are constructed with minimal spacing between sheath and heating elements to maintain lower internal temperatures which result in smaller-sized heaters operating at higher watt densities.

Constructed of high-grade Nickle Chromium resistance wire wounded on specially designed cores, separated from metal sheath using high purity magnesium oxide fill, all centered and tightly compacted in SS/Inconel tubing through the refined swaging process, results in heaters with a minimal air gap, high resistance to corrosion and oxidation, and increased life which makes Marathon make cartridge heaters best in class with high performance and longer durability.

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Application Areas

Semiconductor chamber heating
Semiconductor wire and die bonding
Freeze protection and deicing of equipment in cold climates or applications
Humidity control
Patient comfort heating used in medical devices
Metal die casting
Seal bars used in packaging equipment
High-temperature glass forming equipment

Sheath Material	Stainless steel, INCOLOY
Operating Temperature	Up to 760°C
Watt Densities	Up to 400 W/in2
Voltage	Up to 480V AC
Sheath Length Tolerance	±3%
Wattage Tolerance	+5%, -10%
Resistance Tolerance	+10%, -5%
Termination Style	Swaged in leads, Crimped on leads, Right angle leads, Swaged in stainless steel braid, etc.

Construction

1. High-Temperature Lead Wires for temperatures up to 550° C

2. High Impact Ceramic Cap retards contamination and is suitable for high vibration applications. Deep holes in the cap prevent the fraying of lead when bent.

3. Nickel Chromium Resistance wire for maximum life, evenly wound for even heat distribution.

4. High Purity magnesium oxide fill selected for maximum dielectric strength and thermal conductivity, highly compacted for maximum heat transfer.

5. Stainless steel sheath / Inconel sheath for oxidation and corrosion resistance in a wide variety of environments.

6. Tig welded end disc to prevent contamination and moisture absorption

Termination Options

Ceramic Bead

When the temperature at the exit of the heater exceeds 590°C, ceramic beads protect the wire until conventional insulation can be utilized.

Copper Elbow Flexible SS Conduit

Right angle flexible conduit can also be attached with a copper elbow. This method can also be used to attach a right-angle flexible conduit to stock heaters.

Crimped on leads

Crimp-on leads are generally used where the temperature at the end of the heater exceeds the maximum allowable temperature of the lead wire.

Right Angle Leads

Right angle leads are ideal for applications with tight spaces. Leads are covered with a silicon impregnated fiberglass sleeve where they exit the heater.

Right Angle SS Flexible Conduit

It offers the same advantage as that of stainless steel flexible conduit but the right angle arrangement allows it to be used in tight spaces.

Sleeving

Silicon Rubber Fiber Glass Sleeving and Fiber Glass Sleeving

SS Flexible Conduit

A flexible conduit provides maximum protection to lead from abrasion but cannot bend as sharply as stainless steel braid. Flexible conduits are also swaged in, thus providing the same benefit of not being pulled out of the heater.

End Seal Options

Teflon Seal

Teflon seal is used where effective sealing is required against moisture and oil contamination. Teflon lead wire is used in conjunction with a Teflon seal to provide an effective barrier.

Epoxy Seal

Epoxy potting forms a good moisture seal with more mechanical strength than a silicon rubber seal. Regular Epoxy is rated at 350°F (177°C) and epoxylite is rated at 600°F (316°C).

Silicon Rubber Seal

High-temperature silicon rubber seal in conjunction with silicon rubber lead wires provides an effective moisture seal up to 400°F (200°C). It is the most impervious seal of all the other moisture seals.

Fitting Options

Single-Ended NPT Fitting

Fittings are available in brass and stainless steel. Brass fittings are brazed on and stainless steel fittings can be either brazed or welded on.

Double Ended NPT Fitting

Double-ended fittings are normally used when it is desirable to mount a box on an immersion heater. Fittings are available in stainless steel and brass.

Flanges

Flanges are used to hold the heater in place preventing heaters from being backed out during operation. These flanges are welded on the lead end of the heater. They are 1/16” thick.

Other Options

Post Terminal

Post terminals are used in applications where easy lead replacement is desirable

Bent Hot Rod

Heaters can be bent at any angle from 10°C to 120°C. Heaters are bent at the unheated section. The option of bending is available in most of the heaters.

Double Ended

Hot rods are also available with electrical termination on each end. Heaters can be made with lead wire, straight pins, or screw terminals.

Technical Specifications

Nominal diameter	Minimum diameter	Maximum diameter	Std. Lead wire gauge	Max amps with std. Lead wire	Max lead wire gauge	Maximum amps	Maximum volts
1/8”	3.022	3.14	24	3.6	24	3.6	240
1/4″	6.19	6.32	24	6	22	9	300
6 mm	5.82	5.97	24	6	22	9	300
6.5 mm	6.35	6.47	24	6	22	9	300
5/16”	7.77	7.89	24	6	22	9	300
8 mm	7.84	7.97	24	6	22	9	480
3/8“	9.37	9.49	22	9	18	15	480
10 mm	9.86	11.96	22	9	18	15	480
12 mm	11.83	12.48	22	9	18	15	480
12.5 mm	12.34	12.67	22	9	18	15	480
1/2″	12.55	12.97	22	9	18	15	480
13 mm	12.85	13.46	22	9	18	15	480
17/32”	13.33	15.84	22	9	18	15	480
14 mm	13.84	13.97	18	15	14	26	480
5/8”	15.72	15.84	18	15	14	26	480

Cartridge Heaters

Cartridge Heaters

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