cartridge heater
20Pages

Same day shipment on 1000’s of models! CARTRIDGE HEATERS CARTRIDGE HEATERS MARATHON HEATER

•  Questions? •  Phone: (830)-775-1417 •  Fax: (830)-775-4379 •  Email: sales@marathonheater.com

HotRod CARTRIDGE HEATERS The engineers at Marathon Heater have developed a cartridge heater that exceeds the performance and durability of other cartridge heaters. Through refinements in the swaging process, specially designed cores, careful selection of magnesium oxide fill, nickel chromium resistance wire, stainless steel tubing, and carefully controlled production processes, HotRods routinely outperform other cartridge heaters in difficult applications. HotRods are available in a wide variety of diameters and configurations. Choose from our 14,000+ stock heaters for immediate delivery or...

Specifications Watt density •  The tighter the hole fit, the better. Loose fit equals poor heat transfer and shorter heater life. Watt density is calculated with the following formula: •  Clearance is determined by taking the hole diameter and subtracting the heater diameter. •  Cycling reduces heater life and high cycling applications should use lower numbers. Watt Density •  Please consult the following tables for the maximum allowable watt density for heating metals. Wattage Heated Length x Diameter x 3.14 Sheath options ÂÂ304 s/s steel is standard •  Incoloy: For applications to 1600°F...

Termination OPTIONS Swaged in leads •  Swaged in leads are ideal for applications where there is a lot of movement or the leads must be bent sharply upon exiting the heater. •  Please note that for heaters over 3” long there is a short unheated section where the leads connect to the power pins. Unheated Length •  Also remember that if the heater is inserted completely into the hole, the leads are exposed to the block temperature (maximum temperature for standard leads is 550°C , 1022°F.). •  Unless otherwise specified, all heaters are supplied with swaged in leads. Unheated Length at Lead...

Termination OPTIONS Straight braid Unheated Length •  Swaged in stainless steel braid provides excellent abrasion protection while allowing the leads to be bent in a tight radius. •  Because the braid is swaged in, it is extremely resistant to pulling out of the heater. Unheated Length at Lead End of Heater Heater Diameter (inches) Heater Length Under 3” long Over 3” long Right angle braid Unheated Length •  Right angle stainless steel braid offers the same advantages as straight swaged in stainless steel braid but allows use in tight spaces. Extension Length •  When ordering, please...

Termination OPTIONS Right Angle Stainless Steel Flexible Conduit Unheated Length •  Right angle stainless steel conduit offers the same advantages as swaged in stainless steel conduit but allows use in tight spaces. Extension Length •  When ordering, please specify the overall length. Unheated Length at Lead End of Heater Heater Diameter (inches) Heater Length Under 3” long Over 3” long Extension Length Conduit O. D. Convoluted conduit •  It is not a seal at all, but rather a sealed, stainless steel, flexible hose brazed to the heating element. •  This protects the leads and covers the end...

Termination OPTIONS Copper coupler •  Flexible conduit can also be attached to the sheath with a copper coupler. Insertion Length •  This method can also be used to attach flexible conduit to stock heaters. Order Length = Insertion Length + “A” Length Heater Diameter “A” Dimension “B” Dimension Conduit O.D. Ceramic beads •  When the temperature at the exit area of the heater is higher than 1100°F, ceramic beads protect the wires until conventional insulation can be utilized. Straight pins Unheated Length •  Conductor pins bonded to resistance wire. •  Uses minimum unheated length at end of...

Termination OPTIONS SLEEVING Silicone Rubber 200 °C Fiberglass Sleeving Fiberglass Sleeving 240 °C Comments Can sleeve both leads together or each lead separately. Good for lead protection and used over crimps. END SEALS ÂÂ ÂÂ LAVA SEAL Epoxylite© Potting •  A swaged in lava plug protects the internal cartridge from contamination. •  Provides similar mechanical properties as epoxy potting. EPOXY POTTING •  Provides protection against some thicker liquids and dust, however it is not waterproof. It is also somewhat brittle and subject to cracking in high impact or high vibration applications....

Fitting OPTIONS Single ended npt fittings SPECIFICATION CHART Heater Diameter NPT Thread Size Brass “A” Brass “B” Stainless Steel “A” Stainless Steel “B” double ended npt fittings SPECIFICATION CHART Heater Diameter NPT Thread Size Brass “A” Brass “B” Stainless Steel “A” Stainless Steel “B” CUSTOM fittings Tapered Threads • Straight Threads • Brass Cubes • Stainless Steel Cubes Straight Threads • Others to Your Specifications

OTHER OPTIONS INTERNAL THERMOCOUPLE •  Built-in thermocouples can be of type “J” or type “K”, grounded or ungrounded, and attached either at the disc end of middle of the cartridge. Center of cores, measures heater temperature, not part temperature. •  Thermocouple lead wire is 24 ga. solid and, unless otherwise specified, thermocouple leads are the same length as the power leads. •  When ordering, please specify type, location, grounded or ungrounded (if not specified, you will receive grounded), and insulation material (if not specified, you will receive fiberglass). Middle, grounded,...

CONSTRUCTION OPTIONS LENGTH CONTROL •  Due to the large reduction in diameter during the swaging process, cartridge heaters also grow in length. Although the length change is fairly predictable, it is influenced by many factors and yields a larger length tolerance than is found in other manufacturing techniques. When dealing with longer heaters this length variation can be an issue in some applications. There are several alternatives in these situations. •  The simplest is to just order the heater short enough that when at the maximum length tolerance it does not extend beyond the block it...