The Revolutionary Watt-Flex® Split-Sheath Cartridge Heater
| Available Diameters |
Nominal Diameters (1) | Standard Cold Section at Terminal End | Min – Max (2)Lengths |
| 1/4” | 0.245” | 5/16” | 1”- 22” |
| 3/8” | 0.370” | 3/8” | 1 1/2” – 36” |
| 1/2” | 0.495” | 5/8” | 2” – 50″ |
| 5/8” | 0.620” | 5/8” | 2 1/2” – 72” |
| 11/16” | 0.683” | 5/8” | 3 1/2” – 64” |
| 3/4” | 0.745” | 5/8” | 3 1/2” – 90” |
| 1″ | 0.9925″ | 1” | 8” – 60” |
| 8.0 mm | 7.875 mm | 8.000 mm | 38 – 660 mm |
| 10.0 mm | 9.875 mm | 9.500 mm | 38 – 915 mm |
| 12.0 mm | 11.875 mm | 15.875 mm | 50 – 1140 mm |
| 12.5 mm | 12.375 mm | 15.875 mm | 50 – 1140 mm |
| 15.0 mm | 14.875 mm | 15.875 mm | 65 – 1250 mm |
| 16.0 mm | 15.875 mm | 15.875 mm | 65 – 1775 mm |
| 20.0 mm | 19.875 mm | 15.875 mm | 100 – 1825 mm |
| 25.0 mm | 24.87 mm | 24.5 mm | 200- 1525 mm |
| (1) Tolerances: ±.002″ ( 1/4″ to 3/4″); ±.0025 (1″ ); ±.05mm (8mm-20mm); ±.06mm (25mm) | |||
| (2) Tolerances: ± 3% with 3/32″minimum; ±2% above 20 ” (500 mm) | |||
Watt-Flex Cartridge Heaters run more efficiently, use less power and last up to 5 times longer than conventional cartridge heaters.
A single continuous heating coil ensures a uniform temperature profile. No sections to burn out as in conventional cartridge heaters.
Split-sheath expands to maximize heat transfer and contracts when cold for easy removal from bore.
Ideal for use in oversized bores. Eliminates need for tight fits, tight tolerance bores.
Watt-Flex’s tightly compacted MgO dielectric accommodates higher watt densities – up to 50% higher warrantable watt densities than conventional heaters.
External Thermocouple Option- a Watt-Flex exclusive-provides more accurate temperature at the point of heat transfer to host metal.
The split-sheath design and highly specialized manufacturing techniques of the Dalton Watt-Flex cartridge heater reduce your total cost of process heating by an average of 40% over other heaters.
Dalton Electric’s Watt-Flex Cartridge Heaters use a unique, patented split-sheath design that allow the heater to 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.
The Watt-Flex heater construction eliminates ceramic cores typically found in conventional cartridge heaters. Dalton has developed and highly-specialized manufacturing techniques to compact high-grade MgO dielectric to near its maximum density around the heater coil, which increases dielectric strength and heat transfer away from the coil, resulting in significantly longer heater life.
Watt-Flex cartridge heaters last up to 5 times longer than conventional heaters with less downtime for heater replacements and lower maintenance costs. Watt-Flex heaters contract when de-energized, eliminating bore seizure and the need for expensive drill-outs.
The unique split-sheath design of the Watt-Flex 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 Heater | Watt-Flex Heater Energized | Watt-Flex Heater De-energized |
| Limited to ordinary thermal expansion, cannot compensate for oversized bores. | The unique bi-lateral expansion of an energized Watt-Flex cartridge heater produces superior metal-to-metal contact with the surrounding bore, thereby maximizing heat transfer. | When de-energized, the Watt-Flex heater contracts for easy removal from bore. |
Cartridge heater life is directly related to its internal operating temperature. Watt-Flex cartridge heaters run substantially cooler and have a more uniform temperature profile than conventional heaters.
The result is Watt-Flex heaters that last up to 5 times longer, have less downtime and lower operating costs than conventional cartridge heaters.
Conventional ceramic core cartridge heaters (shown below) use multiple heating cores that can independently burn out, causing a cold section on the sheath. And voids of coil at core junctions produce cold sections on the heater profile.
Conventional-heater-XRAY
Conventional Cartridge Heater
Unlike conventional ceramic heaters, Watt-Flex heaters use a continuous heating coil to achieve a more uniform temperature profile. With Watt-Flex heaters, there are no independent heating element sections to burn out. Watt-Flex heaters are either totally on or totally off.
Watt-Flex-XRAY
Watt-Flex Cartridge Heater
