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Advanced Thermocouple Assemblies

for Molten Aluminum

A38 Series

Advanced Thermocouple Image

The NC-12 protection tube is a dense, sintered ceramic especially designed for use in many molten non-ferrous metals and corrosive chemicals. It is very strong, thermally shock resistant and dimensionally stable. Additionally NC-12 is vacuum-tight and has high electrical resistance. Mechanical strength is retained at extremely high temperatures (over 1,000 degrees Celsius in air). These features together with very low wear resistance, makes NC-12 an ideal thermocouple protection tube for applications such as molten aluminum, lead, tin, and zinc. Preheating is not necessary because NC-12 has a very low thermal expansion coefficient.

Our NC-12 Protection tubes are also recommended for use in oxidizing environments to 2,200 degrees Fahrenheit. Most acids, such as hydrochloric, nitric, sulphuric, and phosphoric, do not attack NC-12. This material is also resistant to hydrogen gas. It is not recommended for use with caustic solutions and hydrofluoric acid.

  • NOTES:
  • Standard units come with thermocouple type K installed.
  • For duplex units or other calibrations contact factory.
  • Standard support tube is five inches long of stainless steel.
  • This suppOort tUube is of universal design. It comes in either one inch of 1-1/4 inch NPT pipe threadss (depending on diameter of protection tube).
  • Complete with wrench flats for easy installation and it can accept flanges.
Advanced Thermocouple Image
Typical Test Results of NC-12
Resistance to Molten Metals
Material°F°CHolding Time in HoursRemarks
Aluminum
Lead
Tin
Zinc
Magnesium
1.800
752
872
1,022
1,382
2,120
987
400
300
850
750
1,150
3,000
144
144
500
20
7
No Attack
No Attack
No Attack
No Attack
Slightly Attacked
Badly Attacked
Specifications
Part No.Diameter 'D'Length 'L'NPT 'N'
A38-1
A38-2
A38-3
A38-4
A38-5
1
1
1-1/4
1-1/4
1-1/4
19-1/2
25-1/2
37-1/2
49-1/2
56-1/2
1
1
1-1/4
1-1/4
1-1/4
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