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Review & Buy Split Sheath Cartridge Heaters

Expanding Split Sheath Cartridge Heaters 
Split Sheath Cartridge Heaters-Guide & Tips     

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 Heater            NPH De-Energized
                                                       Heater-Energized                        Energized                        Cartridge Heater

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

How To Order Cartridge Heaters

Quotation Request Form

Select Type of Cartridge Heater
Select Cartridge Heaters Configuration Model Below:
(click on cartridge heaters images below to enlarge)

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Outside Diameter
Inserted Length
Overall Length
Lead Length
Lead Exit straight 90° copper elbow
Cartridge Heater Lead Options
Cartridge Heaters Lead Protection Options
Lead Connection Construction swaged in leads crimped on leads
Cartridge Heaters Potting Options
Special Features & Construction
Lead Termination Style
Ground Wire Yes no
Thermocouple None J K T
Thermocouple Junction Grounded Ungrounded
Thermocouple Location Disc End Center Offset
Heater Watt Density medium watt density high watt density
Lead Protection Options fiberglass-high temp sleeve-1200°F s.steel overbraid armor cable gas proof armor cable F/G leads with ceramic beads
Potting Options Ceramic potting -temp rating 1000°F/538°C Epoxy 600°F/315°C Teflon plug 450°/232°C High temp silicone 650°F/343°C
Number of Pcs. Required
Requested Delivery Date
Any additional Application Comments & Details
First Name Last Name
Company Name Position
Address City/State/Province
Zip/Postal Code Country
Phone Number Fax Number
Toll Free Number Email
Web Site OEM Distributor Process User
Quotation Request Required Delivery Date
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Inquiries & Technical Support

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Toll Free: 1-877-674-9744