Mini Plug Thermocouple
Standard K, J, T, E, and N types are available with Φ1–6 mm probe diameters, 20–500 mm stock lengths, and SS304, SS316, or Inconel 600 sheath options. For applications requiring a different probe construction, see our Sheathed Thermocouple range.
Compared with conventional wired sensors, the mini plug provides a convenient plug-in connection without field wiring, making sensor replacement and routine maintenance faster.
Mini Plug Thermocouple Structure
The assembly consists of an armored temperature probe, insulated transition section, lead wire, and mini thermocouple plug. The connector is available in male and female versions, while the probe can be supplied in straight or 90° L-type configurations.
How It Works
Two dissimilar thermocouple alloys generate a thermoelectric voltage when exposed to a temperature difference. The resulting signal is transmitted through the thermocouple lead and mini plug to the connected temperature controller, measuring instrument, or data acquisition system.
Key Features
- Mini plug connection: Connect directly to compatible thermocouple equipment without field wiring.
- Compact probe: Small probe diameters are suitable for confined installation spaces.
- Flexible probe configuration: Straight and 90° L-type probe shapes are available.
- Easy replacement: Plug-in connection simplifies sensor replacement and maintenance.
- Multiple sheath options: SS304, SS316, and Inconel 600 are available for different environments.
- Flexible measurement: Suitable for surface contact and immersion temperature measurement.
Thermocouple Type Selection
Choose the thermocouple type according to the required temperature range, environment, and measurement accuracy. For a broader comparison of thermocouple types, see our thermocouple types selection guide.
| Type | Temperature Range | Common Applications |
|---|---|---|
| Type K | -200°C to 1260°C | General industrial measurement, heating equipment, molds |
| Type J | -40°C to 750°C | Machinery, plastic processing, laboratory equipment |
| Type T | -200°C to 350°C | Low-temperature measurement and laboratory equipment |
| Type E | -200°C to 800°C | Testing equipment, laboratory systems, precision measurement |
| Type N | -200°C to 1300°C | High-temperature equipment and industrial testing |
S, R, and B types are available by special custom order. Actual operating temperature depends on thermocouple type, sheath material, probe diameter, installation conditions, and service requirements.
Stock Sizes
| Probe Diameter | Probe Length | Standard Lead Length | Sheath Material |
|---|---|---|---|
| Φ1 mm | 20–300 mm | 100 mm | SS316 |
| Φ2 mm | 20–400 mm | 100 mm | SS304 / SS316 |
| Φ3 mm | 20–500 mm | 100 mm | SS304 / SS316 / Inconel 600 |
| Φ4 mm | 20–500 mm | 100 mm | SS304 / SS316 / Inconel 600 |
| Φ6 mm | 20–500 mm | 100 mm | SS304 / SS316 / Inconel 600 |
Probe lengths can be supplied within the listed stock ranges. Non-standard lengths are available by custom order. The standard lead length is 100 mm and can be customized.
General Options
| Item | Available Options |
|---|---|
| Probe Diameter | Φ1 mm / Φ2 mm / Φ3 mm / Φ4 mm / Φ6 mm |
| Probe Length | 20–500 mm; custom lengths available |
| Probe Shape | Straight / 90° L-type |
| Mounting | Free-standing probe; clamps or fixtures for fixed installation |
| Thread | No standard mounting thread; free-standing design |
| Sheath Material | SS304 / SS316 / Inconel 600 |
| Junction | Grounded standard; ungrounded optional; exposed junction by special order |
| Connection | Mini thermocouple plug standard; flying leads optional |
| Lead Length | 100 mm standard; custom length available |
| Accuracy | Class 2 standard; Class 1 optional according to IEC 60584-1 |
Mini Plug Temperature Limit
The thermocouple probe can operate within the applicable temperature range of the selected thermocouple type, sheath material, and probe construction. However, the standard mini plug connector has a maximum temperature limit of 250°C. During installation, keep the connector and transition section away from high-temperature areas.
| Item | Specification |
|---|---|
| Mini Plug Temperature Limit | Up to 250°C |
| Thermocouple Types | K / J / T / E / N |
| Accuracy | Class 2 standard / Class 1 optional |
| Standard | IEC 60584-1 |
Installation
- Position the probe in the measured medium or place it against the measured surface.
- Connect the mini thermocouple plug to the matching socket on the temperature controller, indicator, or data acquisition equipment.
- Standard mini plug configurations require no field wiring.
- For fixed installation, use a suitable clamp or fixture because the probe has no standard mounting thread.
- Keep the mini plug and transition section away from temperatures above 250°C.
Important: Only the probe should be exposed to the high-temperature measurement area unless a specially rated connector and lead assembly is specified.
Typical Applications
- Laboratory equipment
- Small heating devices
- Molds and test fixtures
- Small machinery
- Temperature testing equipment
- Heat-treatment testing
- Surface temperature measurement
- Immersion temperature measurement
Related Thermocouple Products
Sheathed Thermocouple:
Sheathed Thermocouple – the main sheathed product for applications requiring different probe sizes, configurations, and installation options.
Other Sheathed Options:
Spring-Loaded Thermocouple
Threaded Compression Fitting Thermocouple
Ultra-Thin Fine Diameter Sheathed Thermocouple
Thermocouple System:
Industrial Thermocouples
Related Thermocouple Resources
- Sheathed vs Assembly Thermocouple – compare the two main probe construction options.
- Thermocouple Applications – review common industrial temperature measurement applications.
- Thermocouple Types Selection Guide – compare K, J, T, E, N, S, R, and B thermocouple types.
Request OEM Support
For OEM, replacement, or custom requirements, send us the thermocouple type, probe diameter, probe length, probe shape, sheath material, junction type, 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 mini plug thermocouples are available for OEM, laboratory, testing, and replacement applications. Contact EaseWise with your required specifications for a fast quotation.
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