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WATTCO
CARTRIDGE HEATERS

CARTRIDGE HEATERS

Product catalog summary

Overview
WATTCO™ cartridge heaters are constructed with a swaged design featuring a high-grade nickel chromium resistance wire wound around a high-quality MgO core, encased in stainless steel. These heaters are suitable for heating metal parts and can be adapted for liquid heating applications. They can achieve temperatures up to 1400ºF (760ºC) depending on material, watt density, and fit selections.

Key Features

Components include nickel chromium wire, MgO core, stainless steel casing, and silicon-impregnated mica glass insulated leads.
Custom sizes, wattages, and materials available upon request.

Benefits

Easy installation and maintenance.
Uniform temperature distribution and high durability.
Oxidation and corrosion resistance.

Selecting a Cartridge Heater
Consider operating temperature, watt density, and sheath material. Different materials are recommended based on application, such as stainless steel for general use and titanium for highly corrosive environments.

Installation Guidelines

Drill a smooth hole for optimal heat transfer and ensure it extends through the section for easy removal.
Protect the heater from liquid contamination and minimize lead wire vibration.

Ordering Information
Specify quantity, catalogue number, tension, wattage, diameter, length of cartridge and lead, and any extra features.

Manufacturing Tolerances

Resistance tolerance: +10% / -5%
Wattage tolerance: +5% / -10%
Diameter tolerance: ±0.002"
Length tolerance: ±1/16" or 1.5% of length

Extra Features and Modifications

Custom tensions and wattages available.
Lengths up to 100 inches can be configured.
Moisture-resistant options include silicon potting and Teflon seals.
Protective lead covers and built-in thermocouples are available.

Table 1: Standard Watt Density Cartridge Heaters
This table provides catalogue numbers for various sheath lengths and diameters, available in 120V and 240V configurations.

Threaded Bushing Specifications
For liquid immersion applications, use brass for temperatures under 750°F and stainless steel for higher temperatures. Dimensions and standard taper pipe threads are specified for different cartridge diameters.

Catalog excerpts

CARTRIDGE HEATERS component parts

Open the catalog to page 1

CARTRIDGE HEATERS component parts OVERVIEW WATTCO™ cartridge heaters are made of a swaged construction that consists in a high-grade nickel chromium resistance wire wound around a high-quality MgO core that is centered in a stainless steel casing. Please consider the following factors in order to select the right cartridge heater. Cartridge heaters are used for several heating metal parts and can be fitted with threaded bushings for liquid heating for certain applications. Cartridge heaters will reach metal temperatures of up to 1400ºF (760ºC) with the appropriate material, watt density, and...

Open the catalog to page 2

CARTRIDGE HEATERS component parts FIG. 2 - WATT DENSITY VS. FIT TOLERANCE AND WORK TEMPERATURE TOLERANCES Please refer to this chart to learn more about the allowed manufacturing tolerances: MANUFACTURING TOLERANCES Resistance tolerance Wattage tolerance (at rated tension) Diameter tolerance Length tolerance Maximum sheath temperature FIG. 3 – SUGGESTED WATT DENSITY FOR HEATING METAL PARTS 2 WHEN ORDERING, PLEASE SPECIFY: Quantity, catalogue number, tension, wattage, diameter, length of cartridge, length of lead, and extra features.

Open the catalog to page 3

CARTRIDGE HEATERS component parts TABLE 1 Standard Watt Density Cartridge Heaters SHEATH LENGTH CATALOG NUMBER ¼ INCH HOLE DIAMETER (0.247 INCH SHEATH DIAMETER) 3/8 INCH HOLE DIAMETER (0.372 INCH SHEATH DIAMETER) 1/2 INCH HOLE DIAMETER (0.497 INCH SHEATH DIAMETER)

Open the catalog to page 4

CARTRIDGE HEATERS component parts TABLE 1 Standard Watt Density Cartridge Heaters SHEATH LENGTH CATALOG NUMBER 5/8 INCH HOLE DIAMETER (0.622 INCH SHEATH DIAMETER) 3/4 INCH HOLE DIAMETER (0.747 INCH SHEATH DIAMETER)

Open the catalog to page 5

CARTRIDGE HEATERS component parts EXTRA FEATURES AND MODIFICATIONS EXTRA FEATURES WATTCO™ cartridge heaters can be custom build to suit other tensions and wattages upon request. Connecting series cartridges on line tensions of more than 300V is not recommended.Please call us at 1-800-4WATTCO (1-800-492-8826) for further details or assistance. WATTCO™ cartridge heaters can be specially configured to any length, up to 100 inches. With longer lengths, special equipment will be necessary for accurate drilling and reaming holes. SHEATH MATERIALS WATTCO™ standard cartridge heaters are made from grade...

Open the catalog to page 6

CARTRIDGE HEATERS

CARTRIDGE HEATERS

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