SERIES-260F-385F

Supported Applications

The Omega Series 260F and 385F are flanged thermowells designed for temperature measurement applications requiring protection of standard length elements. These units feature a process connection with internal pipe thread (1" and 1½" NPSM) that accepts NPT and NPS male threads, facilitating installation in systems utilizing threaded fittings or adapters.

Documented application contexts include:

• Chemical baths
• Situations requiring corrosion resistance via specific material selection (e.g., A.I.S.I. 316)

Operating Conditions & Performance

The series is engineered for flanged mounting with pressure ratings of 150 lb/in² or 300 lb/in², depending on the selected flange suffix and size. The thermowells are manufactured in the USA.

Key dimensional parameters defined by model selection include:

• Bore Diameter (B): 0.260" for Series 260F; 0.385" for Series 385F.
• Diameter (Shank Q): ¼" for Series 260F; ⅞" for Series 385F.
• Insertion Length (U): Ranges from 2 to 22 inches, varying by model number suffix (e.g., U2 through U22).
• Stem Length (A): Corresponds to insertion length plus head dimensions, ranging from 4 to 24 inches.

The series supports wetted materials including Carbon Steel (C-1018), A.I.S.I. 304, A.I.S.I. 316, and Monel®. Welding specifications indicate a primary 'J' groove type weld and a secondary 45° bevel groove weld performed by certified welders using inert gas shielded arc.

Configuration Options

The Series 260F-385F offers extensive configurability across flange sizes, pressure ratings, materials, and dimensions. The model number structure follows the format: Series-U(Insertion Length)-Material-Shank Diameter-Bore Diameter (example: 260F-U4-316SS-11/2-300RF-316SS).

Flange and Pressure Options

Standard flanges are available in all facings with the following configurations:

• Sizes (inch): 1, 1½, and 2.
• Ratings (lb/in²): 150 or 300.
• Facing Types: RF (Raised Face) or FF (Flat Face), indicated in the model suffix (e.g., -1-150RF, -2-300FF).

Material and Coating Options

The thermowell body material is specified within the model number:

• Carbon Steel (CS): C-1018.
• A.I.S.I. 304 Stainless Steel (304SS).
• A.I.S.I. 316 Stainless Steel (316SS).
• Monel®: Available as a wetted material option.

Protective coatings including PFA, Epoxy, and other materials are available; consultation with the Sales Department is required for these options. Cap and Chain Options can be added by appending the suffix '-CC' to the model number (additional cost).

Compatibility Notes

The series is compatible with OMEGA® NB1, NB2; PR-12, PR-14, and NPT-style probes, as well as DialTemp™ Thermometers. Metric models are available via the manufacturer's website.

Key Product Differences

The primary distinction between the two series is the bore diameter and shank size:

• Series 260F: Designed for elements with a ¼" (shank) outer dimension, featuring a 0.260" internal bore.
• Series 385F: Designed for larger elements with an ⅞" (shank) outer dimension, featuring a 0.385" internal bore.

Variations in insertion length are denoted by the numeric suffix following 'U' in the model number (e.g., U2 = 2 inches, U16 = 16 inches). Flange size and pressure rating variations are encoded in the flange suffix section of the part number.