A Threaded Compression Fitting Thermocouple is a sheathed temperature sensor with an adjustable compression fitting for secure installation and flexible probe insertion depth. It is designed for pipelines, boilers, furnaces, vessels, ovens, and other equipment requiring stable insertion or immersion temperature measurement.

The compression fitting locks the armored probe in position after adjustment, providing reliable mounting and sealing. K, J, T, E, and N types are available with Φ3–8 mm probes, SS304, SS316, or Inconel 600 sheaths, and metric or pipe thread options.

This design is part of our Sheathed Thermocouple series and is particularly suitable when the probe insertion depth needs to be adjusted during installation.

Key Features

• Adjustable probe depth: Slide the probe to the required insertion depth before tightening the compression fitting.
• Threaded mounting: Provides secure installation on pipelines, equipment chambers, vessels, and other industrial equipment.
• Stable probe fixation: The compression fitting clamps the probe securely after adjustment.
• Armored construction: The sheathed probe provides mechanical protection, flexibility, and fast temperature response.
• Flexible measurement: Suitable for insertion and immersion temperature measurement in industrial processes.
• Custom configurations: Probe diameter, length, sheath material, thread, junction, and connector can be customized.

Thermocouple Types

K, J, T, E, and N thermocouple types are available for different temperature measurement requirements. For help comparing thermocouple types, see our Thermocouple Types Selection Guide.

S-Type, R-Type, and B-Type configurations are available for special high-temperature applications. Actual temperature capability depends on thermocouple type, sheath material, probe diameter, installation, and operating conditions.

Stock Sizes

Probe lengths can be cut within the stock range. Longer lengths, special dimensions, and NPT threads are available by custom order.

General Options

Installation

1. Screw the threaded fitting into the equipment mounting hole.
2. Loosen the compression nut and adjust the probe to the required insertion depth.
3. Tighten the compression nut to clamp and secure the probe.
4. Position the probe at the required measurement point inside the process area or measured medium.

The compression fitting provides adjustable positioning and secure fixation. The standard compression fitting has a maximum temperature limit of 450°C. High-temperature alloy fittings are available for applications above 450°C.

Typical Applications

• Pipeline temperature measurement
• Boilers and heating furnaces
• Reaction vessels and industrial vessels
• Ovens and thermal processing equipment
• Fluid temperature monitoring
• Industrial equipment chambers

Related Sheathed Thermocouples

This threaded compression fitting design is part of the Sheathed Thermocouple series. Choose another configuration according to installation space, mounting method, probe diameter, and response requirements.

• Sheathed Thermocouple – Main mineral-insulated thermocouple series.
• Spring-Loaded Thermocouple – Spring-loaded design for applications requiring flexible contact and mounting.
• Mini Plug Thermocouple – Compact sheathed thermocouple configuration with mini-plug connection.
• Ultra-Thin Fine Diameter Sheathed Thermocouple – Suitable for narrow or space-limited installations.

Threaded Compression vs Fixed Assembly Thermocouple

A threaded compression fitting allows the probe insertion depth to be adjusted during installation, while a fixed Threaded Assembly Thermocouple is manufactured with a predetermined insertion configuration. Choose the compression fitting design when field adjustment is important; choose a fixed assembly when the installation dimensions are already defined.

Thermocouple Mounting & Fitting

Choosing the correct mounting method depends on probe diameter, insertion depth, process pressure, temperature, and available installation space. A compression fitting is useful when the probe position needs to be adjusted during installation.

See our Thermocouple Mounting & Fitting Guide for a comparison of threaded, flange, and compression fitting configurations.

Related Thermocouple Resources

• Industrial Thermocouples – Explore the complete industrial thermocouple range.
• Thermocouple Applications – See common industrial temperature measurement applications.
• Sheathed vs Assembly Thermocouple – Compare sheathed and assembly thermocouple constructions.

Request OEM Support

For OEM or replacement requirements, send us the thermocouple type, probe diameter, probe length, thread, sheath material, junction type, connector, and application details. Drawings, photos, or existing samples are also welcome.

Custom threaded compression fitting thermocouples are available for industrial temperature measurement, adjustable probe installation, OEM replacement, and custom process monitoring applications.