NM0325001-500F
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HotFoil Type K Thermocouple Wire | QQ-K-20
High-Temperature Glass-Braided Wire for Heat Treatment Applications
This Type K (Chromel/Alumel) thermocouple wire is engineered specifically for demanding industrial heat-treating environments, such as pre-heating and post-weld heat treatment (PWHT). The QQ-K-20 designation signifies a 20 AWG solid-core wire protected by high-quality fiberglass insulation, capable of maintaining accuracy in continuous operating temperatures up to 1200°F (650°C).
Key Performance Features
ANSI Color Coded: Features standard Type K color-coding (Yellow Positive / Red Negative) with a white overall jacket for easy polarity identification during sensor fabrication.
High-Temperature Insulation: Double-glass braided insulation provides excellent dielectric strength and abrasion resistance while withstanding the extreme radiant heat of ceramic fiber heaters.
Solid Conductor Precision: The 20-gauge solid wire construction ensures consistent millivolt output and reduces the "signal drift" often found in lower-quality stranded alternatives.
Economical 500' Spool: The bulk spool format allows technicians to custom-cut "throw-away" thermocouples to the exact length required for specific pipe diameters or vessel sections.
HotFoil Reliability: Manufactured by HotFoil-EHS to meet strict "Special Limits of Error" (SLE) tolerances, ensuring high-accuracy data for critical temperature-controlled cycles.
Technical Specifications
| Feature | Specification |
| Thermocouple Type | Type K (Chromel / Alumel) |
| Wire Gauge | 20 AWG (Solid) |
| Insulation Material | Braided Fiberglass (QQ-K) |
| Temperature Rating | 1200°F (650°C) Continuous |
| Standard Length | 500 ft. Spool (152.4 m) |
| Accuracy Standard | ANSI MC96.1 / ASTM E230 |
| Polarity | Yellow (+) / Red (-) |
Physical Dimensions & Logistics
| Measurement | Dimension / Value |
| Unit Dimensions (L x W x H) | 6.5" x 6.5" x 5.5" (Spool size) |
| Box Dimensions (L x W x H) | 8.0" x 8.0" x 7.0" |
| Shipping Weight | 6.2 lbs |
Ideal Applications
Post-Weld Heat Treatment (PWHT): Monitoring cooling rates on structural and pressure vessel welds.
Furnace Surveys: Mapping temperature uniformity in industrial kilns and ovens.
Foundry Operations: General-purpose temperature measurement of metal surfaces and molds.
Power Generation: Monitoring steam line temperatures during startup and shutdown procedures.
Technical Note: When attaching this wire to a workpiece using a Thermocouple Attachment Unit (TAU), ensure the glass braid is stripped back sufficiently to prevent insulation carbonization, which can cause an electrical short and inaccurate temperature readings.
SKU: 25001-500F