Thermocouple - NANMAC Corporation
Thermocouple - NANMAC Corporation
Thermocouple - NANMAC Corporation
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Heavy Duty High Temperature <strong>Thermocouple</strong> Probes<br />
for Pressures to 20,000 PSI<br />
A12C-EQ Series<br />
A<br />
Many high pressure applications such as reaction chambers often times require temperature<br />
monitoring and control at temperatures from 2,000 degrees Fahrenheit to over 3,000 degrees<br />
Fahrenheit. Since refractory or ceramic sheathed thermocouples are used to monitor these<br />
temperatures, the strength of these sheaths are not sufficient to withstand these external<br />
pressures at these temperatures. In order to prevent the sheaths from collapsing, we have<br />
drilled a small hole through the sheath at the sensing tip end, this feature allows the internal<br />
pressure inside the sheath to equalize with the external pressure; thus, preventing the sheath<br />
from collapsing. Also, we have built a gas-tight pressure seal into the thermowell; so that,<br />
high pressure gases will not escape through the mineral oxide insulation.<br />
This High Temperature <strong>Thermocouple</strong> uses either a molybdenum or tantalum sheath;<br />
having a 1/16 inch hole drilled through the sheath near the junction end. Recommended use<br />
in reducing or neutralizing atmosphere. Both are excellent in thermal cycling applications.<br />
In oxidizing atmospheres either alumina or zirconia sheaths are recommended. Instead of<br />
a 1/16 inch diameter hole, a small slot is machined through the sheath at the sensing end.<br />
Alumina sheath is recommended to about 3,300 degrees Fahrenheit maximum, whereas<br />
zirconia can be used to about 4,400 degrees Fahrenheit. Both of these sheaths must not be<br />
subjected to temperature changes exceeding 200 degrees Fahrenheit per hour.<br />
NOTES:<br />
• All units come with a standard connector<br />
attached (mating connector with cable<br />
clamps furnished).<br />
• All platinum alloy thermocouples use high<br />
purity alumina insulation. All tungsten alloy<br />
thermocouples use magnesia insulation.<br />
• Use of a copper washer suggested to make<br />
a seal, when installing<br />
• Standard unit has EQ hole at Hot end<br />
(EQH); EQ hole at Cold end (EQC) also<br />
available.<br />
• When ordering specify Part No., Length, and<br />
<strong>Thermocouple</strong> Type. Example: A12C-1-12-C<br />
Specifications<br />
Part No. A12C-1 A12C-2 A12C-3 A12C-4 A12C-5 A12C-6 A12C-7 A12C-8 A12C-9 A12C-10<br />
Sheath<br />
Diameter “A” (in.)<br />
0.125 0.187 0.250 0.125 0.187 0.250 0.250 0.375 0.250 0.375<br />
Sheath Material Molybdenum Tantalum Alumina Zirconia<br />
©2011 Nanmac Corp. | 11 Mayhew St. | Framingham, MA 01702 USA 29