5 furnace setups, Exhaust Gas Temperature (EGT): Type K, φ0.25–0.5 mm stranded
| Application | Typical conditions | Recommended wire |
|---|---|---|
| Exhaust Gas Temperature (EGT) | Pre-turbine and post-catalyst temperature for engine calibration, OBD diagnostics and component protection. 200–1050 °C, high vibration. | Type K, φ0.25–0.5 mm stranded |
| EV Battery Thermal Management | Cell, module and pack-level temperature sensing for charge control, thermal runaway detection and lifetime prediction. | Type T or K, φ0.1–0.5 mm |
| Engine Dynamometer Testing | Development and durability testing — oil, coolant, intake air and exhaust temperature. Hundreds of channels per test cell. | Type K, φ0.25–1.0 mm |
| Brake System Testing | Disc and pad temperature during fade and thermal fatigue testing. 200–800 °C, rapid thermal cycling. | Type K, φ0.25–0.5 mm |
| Turbocharger Development | Compressor outlet and turbine inlet temperature. Extremely fast thermal transients — requires minimum wire diameter for response. | Type K, φ0.1–0.25 mm |
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Vibration resistance
Engine-mounted thermocouples experience 10-50 g vibration. Stranded wire is essential — solid wire work-hardens and fractures. 7-strand construction is standard; 19-strand for extreme applications.
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Fast thermal response
Turbocharger and EGT measurements require millisecond-level response to capture transient events. φ0.1-0.25 mm bare wire provides τ ≈ 0.05-0.3 s. Halving diameter improves response time roughly 4×.
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EV battery safety
Battery thermal runaway detection requires multiple thermocouples per module with fail-safe behaviour. Type T is preferred for its accuracy at 20-80 °C and its non-magnetic properties (does not interfere with current sensors).
Frequently Asked Questions
How do you measure exhaust gas temperature reliably on a vibrating engine?
Type K, φ0.25–0.5 mm stranded. The 200–1050 °C range sits inside Type K's envelope, and 7-strand construction survives the vibration that would work-harden and fracture solid wire.
Which diameter gives millisecond response for turbocharger testing?
φ0.1–0.25 mm bare wire, giving a time constant of roughly 0.05–0.3 s. Halving the diameter improves response time by about 4×.
Why is Type T preferred for EV battery thermal management?
Its ±0.5 °C accuracy suits the 20–80 °C band where cell, module and pack temperatures are monitored, and both legs are non-magnetic so they do not disturb current sensors.
What wire is used for brake system testing?
Type K, φ0.25–0.5 mm, across the 200–800 °C range. Rapid thermal cycling during fade and fatigue testing is the main mechanical challenge.
Bottom line: Automotive measurement is dominated by vibration and speed: stranded Type K at φ0.25–0.5 mm for anything engine-mounted, φ0.1–0.25 mm bare wire where thermal transients must be captured, and Type T at φ0.1–0.5 mm for EV battery work, where non-magnetic conductors and ±0.5 °C accuracy matter more than temperature ceiling.