Explosion-Proof Assembly Thermocouple
For a comparison of fixed assembly and mineral-insulated probe designs, see our Sheathed vs Assembly Thermocouple guide.
Key Features
- Flame-proof junction box for fixed industrial temperature measurement.
- Mineral-insulated probe with good mechanical strength and vibration resistance.
- Threaded or flange mounting for pipelines, vessels, furnaces, and process equipment.
- SS304, SS316, or Inconel 600 sheath options.
- Custom probe diameter, insertion length, mounting dimensions, cable, and connector.
- L-Type 90° probe configuration available by custom order.
Explosion-Proof Assembly Thermocouple with Flame-Proof Junction Box
Applications
- Petrochemical and oil & gas equipment
- Chemical reaction vessels
- Industrial pipelines and pressure vessels
- Pharmaceutical production equipment
- Mining and industrial processing
- Industrial furnaces and heating equipment
- Hazardous-area temperature monitoring
Specifications
| Item | Available Options |
|---|---|
| Thermocouple Type | K / J / T / E / N; S / R / B by custom order |
| Probe Diameter | Φ3 / Φ4 / Φ5 / Φ6 / Φ8 mm |
| Probe Insert Length | 50–800 mm; custom lengths available |
| Probe Shape | Straight; L-Type by custom order |
| Mounting | Threaded / Flange |
| Thread Options | M16×1.5 / M20×1.5 / M27×2; custom threads available |
| Flange Options | DN25 / DN40 / DN50; ANSI B16.5 and custom options |
| Sheath Material | SS304 / SS316 / Inconel 600 |
| Junction Box | Aluminum flame-proof junction box |
| Cable Gland | M-Type / NPT-Type optional |
| Connection | Internal terminal connection; custom external cable length |
| Junction Type | Grounded / Ungrounded; exposed by special order |
Temperature Range
| Type | Typical Range |
|---|---|
| Type K | -200°C to 1260°C |
| Type J | -40°C to 750°C |
| Type T | -200°C to 350°C |
| Type E | -200°C to 800°C |
| Type N | -200°C to 1300°C |
Actual operating temperature depends on thermocouple type, sheath material, probe diameter, installation, and service conditions. The junction box working temperature is ≤200°C. An extended probe can be used to keep the junction box away from high-temperature sources.
For help selecting K, J, T, E, N, S, R, or B thermocouples, see our Thermocouple Types and Selection Guide.
Standard Stock Sizes
| Probe Diameter | Insert Length | Mounting |
|---|---|---|
| Φ3 mm | 50–500 mm | Thread / Flange |
| Φ4 mm | 50–600 mm | Thread / Flange |
| Φ5 mm | 50–600 mm | Thread / Flange |
| Φ6 mm | 50–800 mm | Thread / Flange |
| Φ8 mm | 100–800 mm | Thread / Flange |
Stock lengths are available within the listed ranges. Longer or non-standard dimensions can be custom-made.
Installation Notes
- Select the appropriate threaded or flange connection for the equipment.
- Install the probe to the required measurement depth.
- The probe insertion depth is fixed after assembly.
- Route the cable through the cable gland and maintain proper junction box sealing.
- Keep the junction box away from direct heat sources when required.
- For hazardous-area installations, verify that the complete assembly and installation meet the applicable site requirements.
Related Assembly Thermocouples
- Threaded Assembly Thermocouple
- Flange Mounted Assembly Thermocouple
- Wear-Resistant Assembly Thermocouple
- Waterproof Anti-Corrosion Assembly Thermocouple
- Platinum-Rhodium Assembly Thermocouple
For a mineral-insulated probe without a flame-proof junction box, see our Sheathed Thermocouple.
Related Thermocouple Resources
Request OEM Thermocouple Support
Send us your thermocouple type, probe diameter and length, mounting type, thread or flange size, sheath material, junction box requirements, cable configuration, and application conditions. Drawings, photos, and existing samples are 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 explosion-proof assembly thermocouples are available for hazardous-area OEM and replacement applications.
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