铁基含铝并巧妙地加入A12O3粉，即制得铁铝瓷（TLC）特别含金，将铁铝瓷合金制成热电偶（阻）保护管，即成为铁铝瓷热电偶（阻）最关键的零件－－铁铝瓷保护管。根据工作温度、磨损情况、介质种类、压力等式况，制成不同系列的铁铝瓷保护管，现有系列：TLC、TLC1、TLC2、TLC3、TLC4及TLC5六大系列。
这样的装置被称为热电偶，现在通常由半导体材料制成。
Such devices, called thermocouples, are nowadays usually made using semiconductors.
由于补偿导线和热电偶的热电级材料并不完全相同，所以要求它们连接处两接点温度相同，否则又会引入误差。
Since the electrode material of compensating wire and cable and thermocouple are different, the two contacts at the connection must be at the same temperature to avoid further error.
针对陶瓷材料的特点，研制了一种双薄膜式表面热电偶。
A double - membranous Surface thermocouple used in ceramic materials has been developed.
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