Thermocouple - NANMAC Corporation

Heavy Duty High Temperature Thermocouple Probes
for Pressures to 20,000 PSI
A12C-EQ Series
A
Many high pressure applications such as reaction chambers often times require temperature
monitoring and control at temperatures from 2,000 degrees Fahrenheit to over 3,000 degrees
Fahrenheit. Since refractory or ceramic sheathed thermocouples are used to monitor these
temperatures, the strength of these sheaths are not sufficient to withstand these external
pressures at these temperatures. In order to prevent the sheaths from collapsing, we have
drilled a small hole through the sheath at the sensing tip end, this feature allows the internal
pressure inside the sheath to equalize with the external pressure; thus, preventing the sheath
from collapsing. Also, we have built a gas-tight pressure seal into the thermowell; so that,
high pressure gases will not escape through the mineral oxide insulation.
This High Temperature Thermocouple uses either a molybdenum or tantalum sheath;
having a 1/16 inch hole drilled through the sheath near the junction end. Recommended use
in reducing or neutralizing atmosphere. Both are excellent in thermal cycling applications.
In oxidizing atmospheres either alumina or zirconia sheaths are recommended. Instead of
a 1/16 inch diameter hole, a small slot is machined through the sheath at the sensing end.
Alumina sheath is recommended to about 3,300 degrees Fahrenheit maximum, whereas
zirconia can be used to about 4,400 degrees Fahrenheit. Both of these sheaths must not be
subjected to temperature changes exceeding 200 degrees Fahrenheit per hour.
NOTES:
• All units come with a standard connector
attached (mating connector with cable
clamps furnished).
• All platinum alloy thermocouples use high
purity alumina insulation. All tungsten alloy
thermocouples use magnesia insulation.
• Use of a copper washer suggested to make
a seal, when installing
• Standard unit has EQ hole at Hot end
(EQH); EQ hole at Cold end (EQC) also
available.
• When ordering specify Part No., Length, and
Thermocouple Type. Example: A12C-1-12-C
Specifications
Part No. A12C-1 A12C-2 A12C-3 A12C-4 A12C-5 A12C-6 A12C-7 A12C-8 A12C-9 A12C-10
Sheath
Diameter “A” (in.)
0.125 0.187 0.250 0.125 0.187 0.250 0.250 0.375 0.250 0.375
Sheath Material Molybdenum Tantalum Alumina Zirconia
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