split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters

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Split Sheath Cartridge Heaters

split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters
Expanding Sheath Cartridge Heaters
Split Sheath Cartridge Heaters
Split Sheath Cartridge Heaters
Energized Split Sheath Cartridge Heaters
Energized Split Sheath Cartridge Heaters
Split Sheath Insertion Heaters
Split Sheath Insertion Heaters

Split Sheath Cartridge Heaters:

Common Issues with Standard Cartridge Heaters:

Heater removal: a cartridge heater will oxidize after many hours of operation and maybe difficult to remove. Consider drilling a through hole so the heater can be hammered out or choose a split sheath cartridge heater.


Lubricants like graphite or silicone facilitate the insertion of the cartridge heater but can carbonize at higher temperature and then the heater will be really stuck.

For process temperatures above 450 deg F, use high- temp lead wire and ceramic bead insulation. Or order the heater with an additional length of cold section.


The location of the temperature sensor is very critical. If the sensor is too far from the heater, then the surrounding area's ability to dissipate the heat generated by the heater may be exceeded.


The NPH split sheath cartridge heater is designed especially for platen, die or mold industrial heating applications where the holes are poorly drilled or worn through age. Independent expansion of each section of the split sheath cartridge heater when energized, creates intimate contact with the wall of the hole.


Through the patented split-sheath design and highly specialized manufacturing techniques, NPH split sheath insertion heaters reduce your total cost of process heating by an average of 40% over other heaters.


NPH’s split sheath cartridge heaters use a unique, patented split-sheath design that expand when energized to maximize heat transfer through greater contact with the wall of the bore. Better heat transfer means less power is consumed to maintain the set point temperature, reducing operating costs.


This heater construction eliminates ceramic cores typically found in conventional cartridge heaters. NPH has developed and highly-specialized manufacturing techniques to compact high-grade MgO dielectric to its near theoretical maximum around the heater coil, which increases dielectric strength and heat transfer away from the coil which results in significantly longer heater life.


Split sheath cartridge heaters last up to 5 times longer than conventional heaters with less downtime for heater replacements and lower maintenance costs. NPH split sheath cartridge heaters contract when de-energized, eliminating bore seizure and the need for expensive drill-outs.


Maximize Heat Transfer

The unique split-sheath design of the NPH cartridge heater allows the independent, bilateral expansion of each half of the heater outward against the walls of the surrounding bore.


The result is greatly improved heat transfer under normal fit conditions of .005" to .007", assuring superior heat transfer, more uniform process heat, greater efficiency, and reduced consumption of electricity. If bores are oversized from previous use and drill-outs, the bilateral sheath expansion will maximize heater-to-bore contact for the most efficient conduction heating.



Conventional Cartridge NPH Split Sheath NPH Split Sheath Heater Heater Energized Heater Energized De-Energized

Conventional Cartridge: is limited to ordinary thermal expansion, cannot compensate for oversized bores.


NPH Split Sheath Energized Heater: The unique bi-lateral expansion of an energized NPH split sheath cartridge heater produces superior metal-to-metal contact with the surrounding bore, thereby maximizing heat transfer.


NPH Cartridge Heater De-Energized: When de-energized, the NPH split sheath cartridge heater contracts for easy removal from bore.


Split Sheath Cartridge Heaters Selection Guide


The key questions which need to be answered before selecting a cartridge heater for your application are:


*How much wattage is required?

*What voltage will be used?

*What is the heated length? What is the overall length?

*How long are the heater leads or what is the lead length required?

*What is the dimentions of the cartridge heater?

*What is the ambient temperature the cartridge heater will see?

*What is the maximum temperature required from the heater?

*How quickly do you want to reach your operating temperature or set point in hour/minutes?

*What is the type and weight (in lbs.) of the material you want to heat?

*Special Modifications







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Our industrial electric cartridge heaters including metric and imperial heaters...

Consists of the following cartridge/insertion heater categories:

split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Standard imperial and metric round cartridge heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Medium watt density cartridge heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  High watt density cartridge heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Split sheath cartridge heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Square cartridge heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Small diameter/miniature pencil heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Bolt cartridge heaters
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Custom cartridge/insertion heaters

Applications for the above include:

split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Cartridge Heaters for-Extrusion Dies, Liquid Immersion
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Metric Heaters for-Plastic Molds and Injection Molding
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Insertion Heaters for-Plastics Extrusion
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Custom Cartridge Heaters for-Packaging Machinery, Labeling and Sealing
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Square and Round Cartridge Heaters for-Hot Plates and Platens, Hot Stamping
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Cartridge Heaters for-Hot Runner Molds, Various Types of Dies
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Insertion Heaters for- Medical Equipment and Other Industrial Applications

The square cartridge heater configuration simplifies wiring and installation while optimizing performance in a wide range of solid, liquid, and gas heating applications. Tooling applications are particularly well served by the square cartridge heater approach. Typical square cartridge heating applications include platens, molds, sealing bars, sealing plates and dies. Versatile slot style mounting simplifies installation in small tooling components such as bushings and nozzles and is particularly useful when leads must exit at a specific location on the component surface.

Some applications demand much longer heater life, that is where miniature small diameter pencil/cartridge heaters have immense application value. Life expectancies of five, seven or even ten years are not unreasonable for some mission-critical applications:


split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Blood warmers used in medical theaters must never fail
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Battery conditioners for EVA spacesuits on the International Space Station must last ten years      before replacement, due to payload costs
split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters  Here on earth, high throughput semiconductor chip testers must operate without significant      downtime for the 5 year life of the equipment. For these applications, a service life of 50,000 to      90,000 hours is a requirement that is both reasonable and attainable.

Some common issues with most standard cartridge heaters are as follows:

Heater removal: a cartridge heater will oxidize after many hours of operation and maybe difficult to remove. Consider drilling a through hole so the heater can be hammered out or choose a split sheath cartridge heater.

Lubricants: like graphite or silicone facilitate the insertion of the cartridge heater but can carbonize at higher temperature and then the heater will be really stuck.

The NPH split sheath cartridge heateris designed especially for platen, die or mold industrial heating applications where the holes are poorly drilled or worn through age. Independent expansion of each section of the split sheath cartridge heater when energized, creates intimate contact with the wall of the hole.

Through the patented split-sheath design and highly specialized manufacturing techniques, NPH split sheath insertion heaters reduce your total cost of process heating by an average of 40% over other heaters.

NPH’s split sheath cartridge heaters use a unique, patented split-sheath design that expand when energized to maximize heat transfer through greater contact with the wall of the bore. Better heat transfermeans less power is consumed to maintain the set point temperature, reducing operating costs.

Bolt cartridge heaters are used to tighten large bolts that secure heavy machinery and equipment. The shaft of the heater is inserted into the hollow bolt and energized to expand it, which allows further tightening of the nut. Manufactured with a high watt density, they heat up in just a few minutes, resulting in cost savings on reduced man hours removing nuts from bolts and studs. Large bolts can be heated to full expansion in just a few minutes. This heater design is manufactured with specific diameter sheaths to fit industry standard hollow bolts. High watt densities with special heated lengths distribute heat evenly to surrounding bolt.



split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters split sheath cartridge heaters, cartridge heaters, split sheath, split sheath insertion heaters

Telephone: 905-859-8225        Facsimile: 905-859-4691

sales@nphheaters.com

Toll Free: 1-877-674-9744