The excellent heat transfer rate and uniform heating throughout the heating surface are features of Hot Rod Cartridge Heaters. Individually adjustable heating zones make it possible to obtain exact and consistent temperatures for a variety of process requirements, including zone-specific heating and dispersed wattage requirements.
Smaller heaters can operate at higher watt densities because they are built with less space between the sheath and heating components to maintain lower internal temperatures.
Marathon’s cartridge heaters are the best in their class due to their high performance and longer durability. They are made of premium Nickle Chromium resistance wire that has been wound on specially designed cores, separated from the metal sheath using high purity magnesium oxide fill, and all centered and tightly compacted in SS/Inconel tubing through the refined swaging process.
– NOBLEHEAT
| 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. |
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.
 |
| 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.
 |
| 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.
|
| 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.
 |
| Sleeving |
Silicon Rubber Fiber Glass Sleeving and Fiber Glass Sleeving
|
| 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° to 120°. 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.
|
| 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 |
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