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    Stepped tube type K-type thermocouple temperature sensor

    A compact, rugged temperature sensor featuring a stepped stainless steel sheath for precise insertion depth control. Based on K-type thermocouple (NiCr-NiSi) with mineral-insulated construction, it delivers fast thermal response and reliable measurement from -200°C to +1260°C. Ideal for industrial process monitoring, machinery equipment, and confined-space installations requiring limited probe diameter. Available in various sheath diameters, lengths, and wiring configurations.

     

    The stepped tube design allows for easy insertion into equipment while providing a secure mechanical stop, preventing over-insertion and ensuring consistent positioning for repeatable measurements.

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      Features

      1. Wide temperature measurement range: supports PT100/PT1000 RTD, K/J/N/E/S/T/R/B thermocouple types, NTC thermistors, and DS18B20 digital sensors, from -280°C up to +1820°C.
      2. Highly customizable: choose probe diameter (2–20 mm), length (10–2000 mm), stepped tube design, accuracy class, and wiring method to match any installation requirement.
      3. Multiple protection options: moisture-proof, waterproof, corrosion-resistant, and anti-abrasion versions available for harsh environments.
      4. Robust stepped metallic sheath: stainless steel 316L or high-temperature alloy protection tube ensures durability under mechanical stress and chemical exposure.
      5. Flexible tail configurations: bare wire, U-type terminals, pin terminals, connectors, or O-type terminals for easy integration.
      66. Optional cable protection: spring armor or flexible hose for enhanced mechanical protection in dynamic applications.
      7. Class A / Class B / 1/3 DIN B accuracy for RTD; Class I / Class II for thermocouples, complying with IEC 60584 and GB/T 16839 standards.
      8. Easy installation: stepped tube design provides mechanical stop for consistent positioning, with various tail types for quick connection.

      Application

      Stepped tube encapsulated temperature sensors are widely used in industrial processes requiring reliable temperature monitoring under harsh conditions. Typical applications include chemical and petrochemical plants for reactor and pipeline temperature measurement, food and pharmaceutical processing for sterilization and pasteurization monitoring, HVAC systems for duct and chiller temperature control, power generation for boiler and turbine monitoring, semiconductor manufacturing for process chamber temperature control, and automotive testing for exhaust gas temperature measurement. The stepped tube design is particularly suitable for applications requiring precise insertion depth control and protection against moisture, dust, and corrosive media.

      Structures

      The sensor assembly consists of the following key structural elements:
      ① Stepped stainless steel tube: Provides mechanical protection and precise insertion depth control with stepped diameter design.
      ② Temperature sensing element: RTD, thermocouple, NTC, or digital sensor encapsulated inside the tube.
      ③ Insulating filler: High-purity magnesium oxide or ceramic powder ensures electrical isolation and thermal conductivity.
      ④ Lead wires: Extension cables with various insulation materials (PVC, PTFE, fiberglass) for different temperature ranges.
      ⑤ Tail connection: Bare wire, U-type terminal, pin terminal, connector, or O-type terminal for flexible integration.

      Product Types Choosing

      No.

      Parameter

      Detailed Description

      1

      Thermocouple Type

      RTD: PT100, PT1000, PT500, PT200

      Thermocouple: K/J/N/E/S/T/R/B

      NTC: 5K, 10K, 100K, 50K, 2.2K

      Digital: DS18B20

      2

      Accuracy

      RTD: Class A, Class B, 1/3 DIN B

      Thermocouple: Class I, Class II

      NTC: 1%, 2%, 3%

      DS18B20: N/A

      3

      Temperature Range

      RTD: -200~850°C (customizable)

      Thermocouple: -280~1820°C (customizable)

      NTC: -50~300°C (customizable)

      DS18B20: -55~125°C (customizable)

      4

      Wiring Method

      RTD: T=2-wire, S=3-wire, F=4-wire

      Thermocouple: N/A

      NTC: N/A

      DS18B20: N/A

      5

      Tail Type

      L=Bare wire, U=U-type terminal, Z=Pin terminal, Q=Connector, O=O-type terminal

      6

      Cable Protection

      W=No protection, T=Spring, R=Flexible hose

      7

      Cable Length EL (mm)

      500, 1000, 2000 or customized

      8

      Probe Diameter D (mm)

      2, 3, 4, 5, 6, 8, 10...20 or customized

      9

      Probe Length L (mm)

      10~2000 or customized

      Product Structure Diagram

      k-type

      tc08-illustration

      tc08-schematic-diagram