Omnigrad TW251

Summary

Product identification

The Endress + Hauser Omnigrad TW251 is a thermowell for general industrial and hygienic applications. It features an integrated compression fitting and can be attached to pipes and vessels via threaded or weld-in process connections.

Operating limits

• Maximum process pressure:
  • 5 MPa (50 bar) at 20°C
  • 3.3 MPa (33 bar) at 250°C
  • 2.4 MPa (24 bar) at 400°C
• Maximum process temperature (well stem): 600°C
• Maximum temperature of compression fitting:
  • 180°C (with PTFE sleeve)
  • 400°C (with SS 316 sleeve)
• Maximum flow velocity: Decreases with increasing immersion length exposed to the stream.

Feed water

Not applicable for this product.

Product water

Not applicable for this product.

Electrical

Not applicable for this product.

Mechanical / hydraulic

• Construction: Tube well with an outer diameter of 9 mm.
• Inner diameter: Accommodates probes with a 6 mm diameter (straight execution). Tapered and reduced executions can house inserts with a 3 mm tip.
• Materials (Wetted parts): SS 316L/1.4404.
• Sleeve material options: PTFE or SS 316.
• Process connections:
  • Threaded: G ½", G ¼", NPT ½"
  • Weld-in: Cylindrical, spheric
• Executions: Straight, reduced, or tapered tip.
• Weight: 0.5 to 1.5 kg for standard options.
• Surface finish: Minimum Ra < 0.4 microns available.
• Immersion length: Available in standard dimensions, with custom lengths possible. A minimum immersion length of 80 mm is recommended for accuracy. Specific minimums apply for reduced (45 mm) and tapered (85 mm) executions.

System components

Thermowell

• Diameter: 9 mm outer diameter.
• Tip types: Straight, reduced, or tapered.
• Finishing: Ra < 0.4 microns is available.

Compression fitting

• Sleeve materials: PTFE or Stainless Steel 316.
• Functionality: Allows for probe replacement without process interruption (PTFE sleeve) or permanent sensor fixing (SS 316 sleeve).

Process connection

• Types:
  • Threaded: G ½", G ¼", ½" NTP
  • Weld-in: Cylindrical or spheric
• Availability: Standard options selectable from sales structure, special options available upon request.

Certificates

• Material certification: 3.1.B material certificate (EN 10204) is selectable. Standard, labelled, and roughness options are available.

Additional information

• Maintenance: No specific maintenance required for the thermowell itself. PTFE sleeves should be periodically checked and replaced if sealing efficiency decreases.
• Delivery time: 10 to 20 working days for small quantities (approx. 10 units) and standard options.
• Accessories: Kits of sleeves (SS 316 or PTFE) and thermoconductive paste are available.

Disclaimer Extraction may miss figures, footnotes, or revisions; contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror