- Cartridge Heaters-Lead Configurations, Exits, Mounting Styles and Lead Protection Options
- Bolt Cartridge Heaters
- Small Diameter Miniature Pencil Heaters
- Square Cartridge Heaters
- Split Sheath Cartridge Heaters
- Heat Calculations Watt Density Cartridge Heaters 2
- Tolerances-Cartridge Heaters
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Electrical Terminations Cartridge Heaters
Electrical Terminations-Cartridge Heaters-Lead Types & Lead Protection Options:
Cartridge Heaters with Crimped-On Leads
A high temperature double crimp connects the MGT (450ºC) leads to solid nickel pins. This construction is recommended for applications with elevated temperatures. Due to the rigid nickel pins, this construction is not recommended in applications where movement or flexing is encountered, or if sharp bends are required adjacent to the heater exit.
Cartridge Heaters with Swaged-In Leads
High temperature MGT (450ºC) wire is internally connected and swaged in place. This construction is recommended for applications in which the leads must be bent at the exit point from the heater and where mild flexing may be found. For applications with continuous or more severe movement, we would recommend metal braid or armor cable.
Cartridge Heaters with Stainless Steel Braid
High temperature MGT (450ºC) wire is internally connected and swaged in place. This construction offers protection against abrasion and sharp edges. This is a very strong construction which offers full length flexibility. This construction is recommended in applications with flexing and where the leads must pass through metal openings or routed along metal components.
Cartridge Heaters with Stainless Steel Hose (Armor Cable)
High temperature MGT (450ºC) wire is internally connected and swaged in place. This construction is recommended for applications in which the leads are subjected to abrasion or run the risk of being pinched. This is the strongest lead protection available and works well in moving or flexing applications.
Cartridge Heaters with Right Angle Fiberglass Leads
High temperature MGT (450ºC) leads exiting at right angle to the sheath. This construction offers a compact design where space is limited. This construction is not recommended where abrasion or flexing is present.
Cartridge Heaters with Right Angle Stainless Steel Braid
Stainless steel braid over high temperature MGT (450ºC) wire exiting at right angle to the sheath. This construction is recommended in applications with flexing and where the leads must pass through metal openings or routed along metal components. This construction is desirable when space is limited and it is not feasible to bend standard leads.
Cartridge Heaters with Copper Elbow
Armor cables are less flexible than stainless steel braids, but provide contamination resistance in addition to superior protection against abrasion. A copper elbow braised to the cartridge externally, provides a 90° transfer.
Cartridge Heaters with Right Angle Stainless Steel Hose (Armor Cable)
Stainless steel hose over high temperature MGT (450ºC) wire exiting at right angle to sheath. This is the strongest lead protection for use in applications where severe abrasion is present. These leads offer good flexibility and are good for moving or flexing applications
Cartridge Heaters with Single or Double Threaded Fittings - Brass or Stainless Steel NPT Fittings.
Single or double threaded fittings attached to sheath to allow for installation into threaded holes.
Cartridge Heaters with Mounting Flange
Mounting flanges are recommended for applications where vibration or movement may cause the heater to be dislodged from its hole. Stainless steel flanges are available in a variety of sizes and configurations. The standard flange is round and is supplied with two mounting holes. For heaters 5/8" diameter and under, the flange would be 1 1/2" in diameter. For larger diameter heaters the standard flange would be 2.00" in diameter
Cartridge Heater with Teflon End Seal
A Teflon plug is swaged in place along with Teflon leads. This construction resists oil and water to 250°C/480°F. There is a minimum of a 1.00" unheated length at the lead end. Longer cold sections may be required if the watt density or operating temperature is high.
Cartridge Heater with Screw Terminals
Threaded stud terminals are supplied complete with high temperature nuts and washers. Standard screw is #8-32. Available in 5/8", 3/4", 1", 16 mm and 20mm diameters heaters.
Cartridge Heaters with Double Ended Terminals
These terminations are ideal for applications where wiring form both ends is required. A minimum cold section of 1" is required for these leads.
Available Terminations
- Solid nickel pins
- Lead Wires
- Threaded Studs
Cartridge Heater with Terminal Boxes
Terminal boxes are permanently attached to the heater sheath to provide excellent protection in a variety of environments.
Available Boxes
- General purpose sheet metal
- Moisture proof
- Cast aluminum explosion resistant
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Cartridge Heater Leads and Lead Protection Options:
Cartridge Heaters Leads- NPH supplies several types of leads for cartridge insertion heaters.
Fiberglass (standard)
Temperature rating : 482°F | 250 °C
Silicone
Temperature rating : 356 °F | 180 °C
Silicone cable
Temperature rating : 356 °F | 180 °C
Teflon
Temperature rating : 500 °F | 260 °C
Teflon (High Amperage)
Temperature rating : 500 °F | 260 °C
Fiberglass (High Temp.)
Temperature rating : 932 °F | 500 °C
Lead Protection for Cartridge Heaters
NPH offers the following lead protection options
Fiberglass Sleeve
Braided Metal Sleeve
Armor Cable
Armor Cable (Gas Proof)
Potting options for Cartridge Heaters- NPH is also a supplier of various potting options for Cartridge heaters.
Ceramic
Temperature rating : 1000 °F | 538 °C
Epoxy
Temperature rating : 600 °F | 315 °C
Teflon Plug
Temperature rating : 450 °F | 232 °C
Silicone
Temperature rating : 500 °F | 260 °C
Silicone (High Temp.)
Temperature rating : 650 °F | 343 °C
- Standard imperial and metric round cartridge heaters
- Medium watt density cartridge heaters
- High watt density cartridge heaters
- Split sheath cartridge heaters
- Square cartridge heaters
- Small diameter/miniature pencil heaters
- Bolt cartridge heaters
- Custom cartridge/insertion heaters
Applications for the above include:
- Cartridge Heaters for-Extrusion Dies, Liquid Immersion
- Metric Heaters for-Plastic Molds and Injection Molding
- Insertion Heaters for-Plastics Extrusion
- Custom Cartridge Heaters for-Packaging Machinery, Labeling and Sealing
- Square and Round Cartridge Heaters for-Hot Plates and Platens, Hot Stamping
- Cartridge Heaters for-Hot Runner Molds, Various Types of Dies
- Insertion Heaters for- Medical Equipment and Other Industrial Applications
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:
- Blood warmers used in medical theaters must never fail
- Battery conditioners for EVA spacesuits on the International Space Station must last ten years before replacement, due to payload costs
- 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.