I would like to install a thermocouple in an environment that may contain higher than normal concentrations of hydrogen peroxide. I would think that Type ?T? would definitely not be ideal for this because of the copper wire used in type T thermocouples. Looking at type K, I think the chromel may have problems as well with the hyrdrogen peroxide. Can anyone recommend a type of thermocouple to use in this kind of environment?
Thermocouples to use with Hydrogen Peroxide
- Thread starter fifty60
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- Placerville, CA, USA
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- Retired PV System Designer
How about one with a protective sheath so that the TC junction bead and the wires are not exposed?
gadfly56
Senior Member
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- New Jersey
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- Professional Engineer, Fire & Life Safety
I used to use TC's with stainless steel jackets to monitor mixtures of nitric and sulfuric acid. I believe they were from Omega Engineering. I just did a quick check, and you can get them with 304 or Inconel sheath, or PFA coated. Easy peasey.
gadfly56
Senior Member
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- New Jersey
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- Professional Engineer, Fire & Life Safety
I think the TC extension wire was available with a Teflon jacket. I would take ordinary Teflon tape and wrap the junction between the TC assembly and the extension wire a bunch of times and that worked fine. Shouldn't be any need to go MI.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Ordinary MI cannot be used for thermocouple wiring because the two conductors of the TC loop must be made of the same metal as the wires forming the thermocouple junction. If you do not do that, you will have all sorts of problems with the reading varying with the temperature of the splice points as well as the junctions at the end points.
PS: Only one of the wires in the type T thermocouple is copper, the other is the alloy called constantan.
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