T type thermocouple senor is a temperature sensor designed based on the Seebeck Effect principle, consisting of two different metal conductors (pure copper for the positive electrode and copper nickel alloy for the negative electrode, i.e. constantan). It has the characteristics of high stability and excellent low-temperature measurement accuracy. As one of the internationally standardized thermocouple types (compliant with IEC 584 standard), it is widely used in medium and low temperature measurement scenarios in scientific research, industry, medical and other fields.
product introduction
1、 Product Overview
The T type thermocouple senor is a temperature sensor designed based on the Seebeck Effect principle, consisting of two different metal conductors (pure copper for the positive electrode and copper nickel alloy for the negative electrode, i.e. constantan). It has the characteristics of high stability and excellent low-temperature measurement accuracy. As one of the internationally standardized thermocouple types (compliant with IEC 584 standard), it is widely used in medium and low temperature measurement scenarios in scientific research, industry, medical and other fields.
2、 Core Features and Advantages
1. Temperature measurement range
Typical range:- 200 ° C to+350 ° C
Short term limit: can tolerate up to 400 ° C (but long-term use is recommended to be ≤ 200 ° C to extend lifespan).
2. Material composition and polarity
Positive electrode (TP): Oxygen free copper (Cu) with a purity of ≥ 99.9%, with weak oxidation resistance, and should avoid high-temperature oxidation environments.
Negative electrode (TN): Copper (CuNi44), also known as copper nickel alloy (containing 55% copper and 45% nickel), has excellent corrosion resistance.
3. Key performance indicators
Sensitivity (Seebeck coefficient): Approximately 43 μ V/° C, with excellent linearity in the low temperature range (-200 ° C to 0 ° C).
Accuracy level:
Class 2: ± 0.5 ° C or ± 0.4% (whichever is greater)
Precision Class 1: ± 0.5 ° C or ± 0.4% (-40 ° C to+350 ° C)
Response time: Depending on the material of the protective sleeve, the bare wire can be as low as 0.1 seconds (in liquid), and the typical value for stainless steel sleeves is 1-5 seconds.
3、 Structure and selection configuration
1. Standard structure
Protective tube material: optional 304/316 stainless steel, polytetrafluoroethylene (PTFE), ceramics, etc., suitable for different media environments.
Insulation materials: magnesium oxide (MgO), mica, or high-temperature polymers to ensure inter electrode insulation and temperature resistance.
Type of junction box: explosion-proof, waterproof, ordinary plastic shell, etc., meeting the protection level of IP54 to IP67.
2. Optional model parameters
Example of parameter options
Probe diameter 0.5mm, 1.6mm, 3mm, 6mm
Probe length 50mm to 2000mm (customizable)
Output interface bare wire end, micro plug, aviation connector
Special treatment of electromagnetic interference shielding layer, flexible armor
4、 Typical application scenarios
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Low temperature engineering and scientific research
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Measurement of ultra-low temperature media such as liquid nitrogen (-196 ° C) and liquid oxygen.
Cold trap temperature monitoring in semiconductor manufacturing.
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Food and pharmaceutical industry
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Frozen storage (-40 ° C to -18 ° C), pasteurization process (60 ° C to 85 ° C).
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Medical equipment
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Temperature feedback control for low-temperature therapy equipment and biological sample storage boxes.
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Industrial Process Control
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Low temperature section of plastic extruder, drying oven, HVAC system.
5、 Precautions for use
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Environmental restrictions
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Avoid long-term exposure to environments above 350 ° C, as copper electrode oxidation can cause signal drift.
Sulfide corrosion may occur in sulfur-containing and reducing atmospheres, and coating protection or ceramic sheath should be selected.
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Installation points
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Ensure that the temperature measuring point is in full contact with the thermocouple junction to reduce thermal gradient errors.
Stay away from strong electromagnetic fields or use shielded cables to prevent signal interference.
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Calibration and maintenance
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It is recommended to perform an annual freezing point (0 ° C) calibration and check the oxidation status of the nodes after high-temperature use.
When replacing the compensation wire, it is necessary to match the T-shaped special model (such as TX or TC).
6、 Compared to other types of thermocouples
Type Temperature Range Advantages Limitations
T-type -200 ° C~350 ° C Low temperature accuracy, low cost, high temperature oxidation
K-type -200 ° C~1260 ° C wide temperature range, strong universality, low temperature nonlinearity
J-type 0 ° C~750 ° C high sensitivity, resistant to reducing atmosphere and easily corroded by sulfur
7、 Summary
T type thermocouple senor, with its excellent low-temperature measurement performance and economy, has become the preferred sensor in the range of -200 ° C to 200 ° C. Users need to choose protective structures and installation methods based on actual working conditions, and regularly maintain them to ensure long-term stability. For applications that require higher temperatures or harsh environments, K-type or armored thermocouples can be considered as alternative solutions.
