This thermocouple is assembled with two tubes to assure element protection in the event one of the tubes cracks or breaks. Also, two tubes provide additional mechanical strength.

Mullite protection tubes are impervious to gases at high temperature. They have good resistance to thermal shock but poor resistance to mechanical shock; they should be mounted vertically.

Dimensions: 3/8” o.d. primary tube is inside 11/16” o.d. outer tube; 11/16” o.d. primary tube is inside 1” o.d. outer tube.

Aluminum oxide protection tubes have fair resistance to thermal shock and mechanical shock. They are impervious to gases up to 3200°F.

Primary metal industry, heat treat furnaces, forging furnaces and bright annealing. Suitable for ceramics and glass industries. Semi-conductor manufacturing and research laboratories.