Ultra-Thin Fine Diameter Sheathed Thermocouple
Ultra-Thin Fine Diameter Sheathed Thermocouple is a compact mineral-insulated temperature sensor designed for narrow spaces, precision equipment, and fast-response temperature measurement. Probe diameters start at Φ0.25 mm for small holes, gaps, and micro-cavities.
The flexible armored construction provides fast response, vibration resistance, and reliable temperature measurement. K, J, T, E, and N types are available with SS304, SS316, or Inconel 600 sheaths. Probe diameter, length, shape, junction, connector, and lead configuration can be customized for OEM and replacement applications.
As part of our Sheathed Thermocouple range, this fine-diameter design is intended for applications where standard probe sizes cannot fit the available installation space.
Key Features
- Ultra-small diameter: Available from Φ0.25 mm for narrow spaces, small holes, and micro-cavities.
- Fast response: Low thermal mass helps capture rapid temperature changes.
- Flexible probe: Can be bent around installation obstacles with a minimum bending radius of approximately 3–5 times the probe diameter.
- Mineral-insulated construction: MgO insulation provides a compact and durable armored structure.
- Flexible connection: Flying leads are standard, with Mini-plug and standard thermocouple connectors available.
- Customizable construction: Probe diameter, length, sheath material, junction, and connection options can be specified for OEM requirements.
Thermocouple Types
Choose the thermocouple type according to the required temperature range, measurement environment, and application. For help comparing different thermocouple types, see our thermocouple types selection guide.
| Type | Temperature Range | Typical Applications |
|---|---|---|
| Type K | -200°C to 1260°C | Industrial and precision temperature measurement |
| Type J | -40°C to 750°C | Machinery, molds, and laboratory equipment |
| Type T | -200°C to 350°C | Low-temperature measurement |
| Type E | -200°C to 800°C | Testing and precision measurement |
| Type N | -200°C to 1300°C | High-temperature industrial equipment |
S, R, and B types are available by special custom order. Actual temperature capability depends on thermocouple type, sheath material, probe diameter, junction, and operating conditions.
Stock Sizes
| Probe Diameter | Stock Probe Length | Standard Lead Length | Sheath Material |
|---|---|---|---|
| Φ0.25 mm | 50–300 mm | 100 mm | SS316 |
| Φ0.5 mm | 50–400 mm | 100 mm | SS304 / SS316 / Inconel 600 |
| Φ0.75 mm | 50–400 mm | 100 mm | SS304 / SS316 / Inconel 600 |
| Φ1.0 mm | 50–500 mm | 100 mm | SS304 / SS316 / Inconel 600 |
| Φ1.5 mm | 50–500 mm | 100 mm | SS304 / SS316 / Inconel 600 |
| Φ2.0 mm | 50–500 mm | 100 mm | SS304 / SS316 / Inconel 600 |
Probe lengths can be supplied within the listed stock ranges. Custom lengths are available outside the standard ranges. Φ0.25 mm probes are preferably supplied with SS316 sheath.
General Options
| Item | Available Options |
|---|---|
| Probe Diameter | Φ0.25 / Φ0.5 / Φ0.75 / Φ1.0 / Φ1.5 / Φ2.0 mm |
| Probe Length | 50–500 mm; custom lengths available |
| Probe Shape | Straight / 90° L-type |
| Sheath Material | SS304 / SS316 / Inconel 600 |
| Junction | Grounded standard; ungrounded optional; exposed optional |
| Connection | Flying leads standard; Mini-plug / standard thermocouple connector optional |
| Lead Length | 100 mm standard; custom length available |
| Accuracy | Class 2 standard; Class 1 optional according to IEC 60584-1 |
Installation
The fine-diameter probe can be inserted directly into small holes, gaps, micro-cavities, or measured media. Clamps or fixtures can be used when fixed positioning is required. The probe has no standard mounting thread and can be bent to follow suitable installation paths.
For applications using a Mini-plug, keep the connector away from high-temperature areas. The standard Mini-plug has a maximum temperature limit of 250°C.
For applications where the probe must be mechanically secured with an adjustable threaded fitting, see our Threaded Compression Fitting Thermocouple.
Recommended Applications
- Electronic components
- Precision molds and micro-cavities
- Laboratory test equipment
- Transient temperature measurement
- Narrow-space temperature monitoring
- Precision heating equipment
Related Sheathed Thermocouple Products
This fine-diameter thermocouple is part of the Sheathed Thermocouple product series. Choose another configuration when the application requires a different connector, mounting method, or probe construction.
- Sheathed Thermocouple – Main sheathed thermocouple product
- Spring-Loaded Thermocouple – Spring-loaded installation for consistent probe contact
- Mini Plug Thermocouple – Compact plug-in connection
- Threaded Compression Fitting Thermocouple – Adjustable threaded installation
Thermocouple Applications
Ultra-thin sheathed thermocouples are suitable for precision temperature measurement where installation space is limited or rapid temperature response is required.
View Thermocouple Applications
Related Thermocouple Resources
- Sheathed vs Assembly Thermocouple – Compare sheathed and assembly thermocouple constructions for different industrial applications.
- Thermocouple Types Selection Guide – Compare K, J, T, E, N, S, R, and B thermocouple types.
- Industrial Thermocouples – Explore the complete thermocouple product range.
Request OEM Support
For OEM, replacement, or custom requirements, send us the thermocouple type, probe diameter, probe length, sheath material, junction type, probe shape, connector, lead length, and application details. Drawings, photos, or existing samples are also welcome.
Amy – Sales
Email:
amy-easewise@tzheater.com
WhatsApp:
+86 188 8318 8154
Hanna – Sales
Email:
hanna-easewise@tzheater.com
WhatsApp:
+86 178 5163 6811
Custom Ultra-Thin Fine Diameter Sheathed Thermocouples are available for precision, narrow-space, and fast-response temperature measurement. Contact EaseWise with your required specifications for OEM and replacement support.
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