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Thermowell?

Thermowell is a product used to prevent damage of sensors caused by exposure to gas, fluids and so on. Thermowell is installed in pipes and tanks to improve durability, easy replacement of sensor and anti-corrosion while the machine is running.
So, thermowell is used in many fields such as general, petrochemicals, food industries and so on.
Thermowell's production method and material is selected the operating temperature, velocity of flow, pressure, corrosive, hermeticity, response rate, and durability.

① Thermowell type

② Material

Metalic Protection Tube Specifications
Material	Operating Temp.	Max Temp.	Features
Monel	500	600	· Exellent resistance to water vapor, high pressure and corrosion.
Plain Steel	800	900	· Good resistance to reducing atmosphere but less resistant to oxidation and acids attacks.
SUS304	900	1,000	· Widely used as common protection tube against heat and corrosion but not recommendable for use in the presence of sulphur or reducing flame.
SUS304L	900	1,000	· Less carbon content (C=0.03%) than SUS304 and excellent resistance to grain boundaly corrosion.
SUS316	900	1,000	· Contains Molybdenum and excellent resistance to acid and alkali.
SUS316L	950	1,050	· Less carbon content than SUS316 and has better resistance to heat, acid and alkali.
SUS310	950	1,050	· High Mi-Cr content so it has an optimal high temperature strength with resistance to oxidation at high temperatures.
SUS347	900	1,000	· Nb-Ta content more corrosion resistant than SUS304 and has better corrosion resistance to chromium depletion.
SUS446	1,050	1,125	· High Chromium content excellent for heat resistance and oxidation resistance and specially excellent for sulphur and reducing gas.
Inconel600 (Inconel600)	1,175	1,345	· Excellent for resistance to oxidation at high temperature but It us fragile in hydrogen environment and very weak to corrosion in sulphur.
Platinum 10% + Rhodium	1,550	1,850	· Excellent for resistance to oxidation and inert at high temperaiure.
Tantalum	Oxi 300 Red 2,200	2,610	· Good at acids but weak at alkaly and oxidation and above 300℃
Molybdenum	Oxi 300 Red 2,201	2,985	· It has excellent mechanical strength up to 1500℃ when used in inert, reduced or vacuum atmosphere. Can withstand metal steam at high temperatures but graphite and reaction. Air and oxygen-containing gases are not available.

Non- Metalic Protection Tube Specifications
Material	Operating Temp.	Max Temp.	Features
Opaque / Transparent Qutarts	1000	1,100	· 99.99% Quartc, One End close Tube excellent at heat resistance but it breaks easily. Transparent is better heat resistan than opaque
Mullite(PT1)	1,500	1,600	· 60% Alumina + 40% Silica. PT1 slightly better than PT2 at breakge. Recommendable for using heating furnace, regenerator and impervious.
Recrystallized Alumina (PTO)	1,600	1,800	· 99.7% Alumina. PTO better than PT1 at chemical stability and heat resistance. Recommendable for using in iron casting, blast furnace.
Recrystallized Silicon Carbide (GK-SiC)	1,650	-	· 99% SiC. Excellent to resistance of acid and alkali. Recommendable for using in neutral atmosphere up to 1,500℃ and zinc, aluminum, copper casting, blast furnace.
Clay- bonded Silicon Carbide (Red-SiC)	1,500	1,750	· 89% SiC + 8.5% SiO2 + 0.7% AL2O3 + 0.7% Fe2O3. Good at thermal conductivity. So it is possible to measure a temperature more accurately than oxide material. Strong at rapid heating and cooling

Check SENTECH ENG's various thermowells out.