Constant Wattage Heating Cables are ideally suited for applications where constant watt density is required at all times. The heater element consists of a Nichrome™ resistance wire wrapped around parallel insulated buss wires. At specific intervals, a short section of insulation is removed from alternating buss wires to create connection nodes for the nichrome resistance wire. The Nichrome™ wire is soldered to the buss conductors, creating a network of parallel resistors along the entire length of constant wattage cable. They can be designed to operate at specified voltages between 120- 800 Volts AC or DC. Constant watt cables are an ideal choice for higher temperature applications where high watt densities are required.
Conductors
| Product |
Nominal Composition |
Resistivity |
Temperature rating |
ASTM specifications |
NICKEL-CHROMIUM ALLOYS (Heating Elements) |
| NiCr A |
80Ni20Cr |
650 |
1180ºC |
B344, B267 |
| NiCr C |
60Ni, 16Cr, bal Fe |
675 |
1110ºC |
B344, B267 |
| NiCr D |
35Ni, 20Cr, bal Fe |
610 |
980ºC |
B344, B267 |
| NiCr70/30 |
30Cr, 1.45Si, balNi |
710 |
1260ºC |
|
| Even "R" |
75ni, 20Cr, +adders |
800 |
316ºC |
B267 |
| Hi TCR |
72Ni, bal Fe |
120 |
593ºC |
B267 |
| RESISTANCE ALLOYS (Low temperature Heaters) |
| CuNi 294 |
43Ni, bal Cu |
294 |
538ºC |
B267 |
| CuNi 180 |
23Ni, bal Cu |
180 |
538ºC |
B267 |
| CuNi 90 |
11Ni, bal Cu |
90 |
427ºC |
B267 |
| CuNi 60 |
6Ni, bal Cu |
60 |
316ºC |
B267 |
| CuNi 30 |
2,25 Ni, bal Cu |
30 |
316ºC |
B267 |
| COPPER ALLOYS |
| OFHC Copper(102) |
99.95 Cu |
10.3 |
- |
B1,B2,B3 |
| ETP Copper |
99.9 Cu, .04 O2 |
10.3 |
- |
B1,B2,B3 |
| Insulation materials |
Temperature rating |
| FEP |
-70ºC to +200ºC |
| TEFZEL ® |
-65ºC to +150-200ºC |
| ETFE |
-65ºC to +150ºC |
| ECTFE |
-70ºC to +150ºC |
| PFA |
-70ºC to +260ºC |
| MFA |
-70ºC to +250ºC |
| PTFE Tape Wrapped |
-70ºC to +250ºC |
| Polyethylene |
-60ºC to +80ºC |
| PVC |
-20ºC to +80ºC |
| TPE/TPR |
-40ºC to +125ºC |
| HYTREL® |
-40ºC to +80ºC |
TEFZEL® is a registered trademark of the DuPont Company
HYTREL® is a registered trademark of the DuPont Company
Please contact our technical support team for more information:
info@q-stechnologies.com
