-
E-mail
xrybkj@163.com
-
Phone
15155078600
-
Address
589 Tiankang Avenue, Tianchang City, Anhui Province
Anhui Xun'er Instrument Technology Co., Ltd
xrybkj@163.com
15155078600
589 Tiankang Avenue, Tianchang City, Anhui Province
simple structureUsually composed of two metal wires (thermocouple wires) of different materials, insulation material, protective sleeve, and junction box.
Wide temperature rangeDepending on the type, it can measure temperatures ranging from -200 ℃ to+2300 ℃ (such as tungsten rhenium thermocouples).
High durabilityIndustrial grade design can adapt to harsh environments such as high temperature, corrosion, and vibration.
No external power supply requiredSelf generating characteristics simplify system design
| type | Material combination | temperature range | Typical Applications |
|---|---|---|---|
| K-type | Nickel chromium nickel silicon | -200℃~+1200℃ | Metallurgy, chemical industry, general industry |
| J-shaped | Iron copper nickel (constantan) | 0℃~+760℃ | Oxidative environment, vacuum furnace |
| E-type | Nickel chromium constantan | -200℃~+900℃ | Low temperature measurement (such as refrigeration equipment) |
| S/R/B型 | Platinum rhodium 10 Platinum/Platinum rhodium 30 Platinum rhodium 6 | 0℃~+1700℃（S/R） +300℃~+1800℃（B） | High temperature furnace, glass melting furnace, semiconductor manufacturing |
| T-shaped | Copper - Copper Kang | -200℃~+350℃ | Low temperature measurement in the food and pharmaceutical industries |
| N-type | Nickel chromium silicon nickel silicon | -200℃~+1300℃ | High temperature antioxidant environment (replacing K-type) |
temperature rangeSelect the thermocouple type that covers the actual working conditions.
environmental conditions：
Oxidative/reducing atmosphere (such as S-type oxidation resistant, J-type reduction resistant).
Corrosive medium (corrosion-resistant protective sleeve should be selected, such as ceramic or 316 stainless steel).
response speedThin wire thermocouples or bare contacts respond faster, but have lower mechanical strength.
Accuracy requirementsStandard grade (± 1.5 ℃) or high-precision grade (± 0.5 ℃).
Installation methodThreaded fixation, flange installation, insertion depth, etc.
Steel smeltingB-type thermocouple monitors the temperature of molten steel (above 1600 ℃).
petrochemical industryK-type thermocouple is used for temperature monitoring of pipeline reaction vessels.
electrical equipmentE-type thermocouple measures the exhaust temperature of gas turbine.
food processingT-type thermocouples ensure temperature control safety during cold chain or baking processes.
cold junction compensationThe output of the thermocouple is the temperature difference between the hot end and the cold end (reference end), which needs to be corrected by the freezing point method or electronic compensation (such as using compensation wires).
Parasitic potentialAvoid introducing errors at wire joints due to temperature gradients.
protective sleeveTo prevent mechanical damage or chemical corrosion of thermocouple wires, but may increase response time.
electromagnetic interferenceInsulation material resistance decreases under high temperature environment, and signal lines need to be shielded.
Signal anomalyCheck for oxidation, broken wires, or broken protective sleeves on the wiring terminals.
Slow responseDue to the accumulation of scale or increased thermal resistance in the casing, cleaning or replacement may be necessary.
Calibration driftLong term high temperature use may cause changes in the alloy composition of thermocouples, and regular calibration is required.
Industrial thermocouples are still the mainstream temperature sensors in process control due to their reliability and economy, but they need to be matched with specific types and protection according to specific needs