Hi-Density Cartridge Heater Specifications and Tolerances
Performance Ratings
Maximum Temperature: 1400°F (760°C)
Maximum Watt Density: 100-300 W/in2 (15.5-46.5 W/cm2) depending on heater size & operating temperature.
Note: The maximum operating temperature and the life expectancy of a cartridge heater is dependent on two main factors:
1. The maximum recommended sheath temperature (1200°F for a standard heater)
2. The maximum ambient temperature for the termination selected. Consult Tempco if you require a recommendation for your application.
Dimensional Specifications
| Nominal Diameter | 1/4″ | 5/16″ | 3/8″ | 1/2″ | 5/8″ | 3/4″ | 1″ | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| in | (mm) | in | (mm) | in | (mm) | in | (mm) | in | (mm) | in | (mm) | in | (mm) | |
| Actual Diameter | 0.246 | 6.25 | 0.308 | 7.82 | 0.371 | 9.42 | 0.496 | 12.6 | 0.621 | 15.77 | 0.746 | 18.95 | 0.996 | 25.3 |
| Diameter Tolerance | ±.002 | 0.051 | ±.002 | 0.051 | ±.002 | 0.051 | ±.002 | 0.051 | ±.002 | 0.051 | ±.003 | 0.076 | ±.003 | 0.076 |
| Minimum Length | 1 | 25.4 | 1 | 25.4 | 1 | 25.4 | 1 | 25.4 | 1 | 25.4 | 1 1/4 | 31.75 | 1 3/4 | 44.45 |
| Maximum Length | 36 | 914 | 36 | 914 | 48 | 1219 | 60 | 1524 | 72 | 1829 | 72 | 1829 | 72 | 1829 |
| Length Tolerance | ±3/32 | (2.4) | ±3/32 | (2.4) | ±3/32 | (2.4) | ±3/32 | (2.4) | ±3/32 | (2.4) | ±1/8 | (3.2) | ±1/8 | (3.2) |
| Heaters up to 5″ (127 mm) ±2% of Sheath Length Heaters over 5″ (127 mm) | ||||||||||||||
| Camber Tolerance Heaters up to 12″ (305 mm) long | 0.010″ (0.254 mm) per foot of length | |||||||||||||
| Camber Tolerance Heaters over 12″ (305 mm) long | 0.020″ (0.508 mm) per foot of length | |||||||||||||
Scroll table to view all
A certain amount of Camber is unavoidable. With a slight force, Hi-Density Cartridge Heaters will flex enough to fit into a straight reamed hole.
Electrical Specifications
| Nominal Diameter | 1/4″ | 5/16″ | 3/8″ | 1/2″ | 5/8″ | 3/4″ | 1″ |
|---|---|---|---|---|---|---|---|
| Maximum Voltage | 240 | 240 | 240 | 240 | 480* | 480* | 480* |
| Maximum Amperage | 4.4 | 4.5 | 6.7 | 10.5 | 23 | 23 | 23 |
| Maximum Amperage for Types C1C, C1D, C2C, C2D, CS, F, M3, R1B, S1, S2, SA, W & W3 Terminations | 3 | 3 | 5.5 | 7.6 | 9.7 | 9.7 | 9.7 |
| Minimum Wattage at 120V on a 1″ long Heater | 50 | 45 | 45 | 50 | 50 | — | — |
| Minimum Wattage at 120V on a 2″ long Heater | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Maximum Wattage at 120V | 525 | 540 | 800 | 1260 | 2760 | 2760 | 2760 |
| Maximum Wattage at 240V | 1050 | 1080 | 1600 | 2520 | 5520 | 5520 | 5520 |
| Maximum Wattage at 480V | — | — | — | — | 11,000 | 11,000 | 11,000 |
| Wattage Tolerance | Plus 5%, Minus 10% | ||||||
| Resistance Tolerance | Plus 10%, Minus 5% | ||||||
† Current carrying capacities are for ambient temperatures up to 482°F (250°C) with mica insulated lead wires.
*480V when applicable. Consult Tempco.
Length TOLERANCE for:
— Lead Wires
— Wire Braid Leads
— Armor Cable Leads
- Up to 36″: -1/2″, +1″ (-12.7 mm, +25.4 mm)
- 36″ to 72″: -1″, +2″ (25.4 mm, +50.8 mm)
- Above 72″: ±4″ (101.6 mm)
Note: Specifications detailed on this page are standard. Consult Tempco if your application requires tighter tolerances or has other special requirements.
Temperature Coefficient of Resistance
The electrical resistance (ohms) of the heater resistance wire increases with temperature rise.
Tempco standard Hi-Density Cartridge Heaters are manufactured with ohms (cold ohms) 3.3% lower than the actual calculated ohms (hot ohms) to compensate for this increase.
Available Electrical Features
| Diameter | Dual Volts | 3-Phase | Dual Circuits | Multiple Heat Zones (maximum 3 zones) |
|---|---|---|---|---|
| 1/4″ | No | No | No | No |
| 5/16″ | No | No | No | No |
| 3/8″ | Yes* | No | No | Yes* |
| 1/2″ | Yes* | Yes | Yes | Yes* |
| 5/8″ | Yes | Yes | Yes | Yes |
| 3/4″ | Yes | Yes | Yes | Yes |
| 1″ | Yes | Yes | Yes | Yes |
Consult factory for maximum wattages and voltages.
* Heaters may require a larger diameter transition area at lead end.
