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Type K (chromel alumel) is the most widespread general purpose thermocouple having the sensitivity of around 41 µV/°C (chromel positive relative to alumel once the junction temperature is more than the reference temperature). It is a low-cost sensor with a range of probes available in 200 °C to +2460 °F to +1350 °C / -330 °F range.
Type K was specified when metallurgy was not that much advanced as it is today that make its consequently characteristics differ between samples. One of its essential metals, nickel is highly magnetic. The thermocouples are made using magnetic material; hence they undergo a divergence in output when the substance reaches its Curie point. This is done only in type K thermocouples approximately at 185 °C.