Profile Thermocouples
Profile thermocouples are used in conjunction with spike thermocouples and are available for both vertical and horizontal furnaces. Sheath material is typically Momentive 214 (GE 214) semiconductor grade quartz in 8mm, 10mm or 12mm outside diameters. The quartz sheaths may be equipped with a 28/15 socket for mating up to a ball joint if your furnace is so equipped.
The internal thermocouples are typically supplied with a 3-zone or 5-zone configuration. The thermocouple wire can populate either a single 6-hole or 10-hole insulator. Alternatively, the wires can populate three or five 2-hole insulators.
6-hole or 10-hole insulator
Three or five 2-hole insulators
Connectorization is accommodated by standard or miniature 2-pin connectors. Multi-pin screw or bayonet-style connectors are also offered. The lead wires between the probe and the connectors run continuously, using the same noble metal thermocouple wire as is installed in the quartz sheath. As a cost savings option, Conax can transition to extension grade for the lead wires. See the following chart for more details.
Tolerance of Thermocouples Extension Wire
| ANS/IASTM | Temperature Range (°C) | Standard (°C) | Special (°C) | Temperature Range (°F) | °F Standard (°F) | Special (°F) |
| TX | -60 to 100 | ± 1.0 | ± 0.5 | -75 to 200 | ± 1.8 | ± 0.9 |
| JX | 0 to 200 | ± 2.2 | ± 1.1 | 32 to 400 | ± 4.0 | ± 2.0 |
| EX | 0 to 200 | ± 1.7 | ± 1.0 | 32 to 400 | ± 3.0 | ± 1.8 |
| KX | 0 to 200 | ± 2.2 | ± 1.1 | 32 to 400 | ± 4.0 | ± 2.0 |
| NX | 0 to 200 | ± 2.2 | ± 1.1 | 32 to 400 | ± 4.0 | ± 2.0 |
| SX | 0 to 200 | ± 5.0 | † | 32 to 400 | ± 9.0 | † |
| RX | 0 to 200 | ± 5.0 | † | 32 to 400 | ± 9.0 | † |
| BX1 | 0 to 200 | ± 4.2 | † | 32 to 400 | ± 7.6 | † |
| B2 | 0 to 100 | ± 3.7 | † | 32 to 200 | ± 6.7 | † |
| C | 0 to 200 | ± 0.110 mV | † | 32 to 400 | ± 0.110 mV | † |
† Special tolerance grade compensating extension wires are not available.
1 Proprietary alloy compensating extension wire is available for use over a wide temperature range.
2 Special compensating extension wires are not necessary with Type B over the limited temperature range 0° C to 50° C (32° F to 125° F), where the use of non-compensated (copper/copper) conductors introduces no significant error. For a somewhat larger temperature gradient of 0° C to 100° C (32° F to 210° F) across the extension portion of the circuit, the use of non-compensated (copper/copper) extension wires may result in small errors, the magnitude of which will not exceed the tolerance values given in the table above for measurements above 100° C (200° F).