Emerson Rosemount 1097 Thermowell

Emerson Rosemount 1097 Thermowell

Introduction

The Rosemount 1097 Compact Thermowell represents a field-proven solution for industrial temperature measurement applications where sensor protection against harsh process conditions is paramount. Manufactured by Emerson Automation Solutions under the Rosemount brand, this compact barstock thermowell is engineered for demanding environments across chemical processing, petrochemical refining, power generation, and oil & gas industries-1.

Designed with a tapered tip profile, the Rosemount 1097 Thermowell offers faster thermal response times compared to conventional straight-bore designs, enabling more accurate and responsive temperature monitoring while maintaining robust mechanical integrity-14.

Product Status Notice: The Rosemount 1097 Thermowell is discontinued as a standard catalog offering. This technical article is provided for reference purposes to support existing users and legacy system maintenance. For new installations, consult your local Emerson representative for current replacement solutions-5.

Key Features of the Rosemount 1097 Thermowell

The Emerson Rosemount 1097 Thermowell incorporates several engineering features that contributed to its widespread adoption in process industries:

Compact Barstock Construction – Machined from solid barstock rather than welded tubing, the 1097 series provides superior strength and dimensional accuracy. The full barstock construction eliminates potential weak points associated with seam-welded designs-1.

Tapered Tip Design – The tapered stem profile allows for faster heat transfer from the process medium to the temperature sensor, significantly reducing response time lag without compromising structural strength-11.

Flanged and Welded Mounting Options – Available in flanged (for easy removal and maintenance) or welded (for permanent, leak-tight installations) configurations, the Rosemount 1097 adapts to diverse process connection requirements-1.

Full Penetration Weld Standard – Unlike competitive designs that may use partial-penetration welding, the 1097 series features full penetration welding as standard, delivering enhanced thermowell strength and long-term durability under cyclic thermal and mechanical loading-1.

Integral Thermowell Extensions – One-piece extension design eliminates separate extension nipple components, simplifying configuration, reducing potential leak paths, and streamlining installation procedures-14.

Material Certification Option – Traceable material certification ensures material pedigree and process compatibility verification for critical applications requiring documented quality assurance-14.

Detailed Technical Specifications

General Specifications

Materials of Construction

The Rosemount 1097 Thermowell was available in a range of materials to accommodate diverse process media compatibility requirements:

316L Stainless Steel – Standard material for general-purpose corrosive service, offering excellent resistance to pitting and crevice corrosion in chloride-containing environments

304L Stainless Steel – Suitable for less aggressive applications, providing good corrosion resistance and formability

Carbon Steel – For non-corrosive or mildly corrosive services where cost optimization is a priority

Additional exotic materials available upon request (consult Emerson for specific alloy availability)-1-14

Mounting and Process Connection

Stem Profile

Profile Type: Straight with tapered tip

The tapered tip geometry reduces thermal mass at the sensing end, enabling faster thermal response while maintaining sufficient wall thickness for mechanical strength-11-1

Certifications and Approvals

Material Certification – Available for material traceability verification

CRN Registration – Canadian Registration Number approval for use in Canada (where applicable)

ASME Compliance – Design and manufacturing aligned with ASME B16.5 and ASME PTC 19.3 TW standards-23-

Performance Characteristics

Note: Specific numerical performance values (pressure ratings, temperature limits, velocity limits) vary based on selected material, mounting configuration, and process conditions. For accurate application-specific calculations, the Rosemount Thermowell Design Accelerator tool provides ASME PTC 19.3 TW-compliant engineering analysis-.

Installation Guidelines for Rosemount 1097 Thermowell

Proper installation of the Rosemount 1097 Thermowell is essential for achieving accurate temperature measurement and ensuring long-term reliability. Follow these procedures:

Pre-Installation Verification

Verify Insertion Length – Ensure the thermowell insertion length positions the sensor tip at the optimal location (typically the pipe centerline for most applications)

Confirm Material Compatibility – Verify that the thermowell material (316L SST, 304L SST, or carbon steel) is suitable for the process media, temperature, and pressure

Inspect for Damage – Check the thermowell for any shipping damage, particularly to the tapered tip and threaded bore

Installation Procedure

Step 1: Mount the Thermowell
Attach the Rosemount 1097 Thermowell to the pipe or process container wall. For flanged configurations, ensure proper gasket selection and bolt torque. For welded configurations, follow applicable welding procedures and post-weld heat treatment requirements if specified.

Step 2: Tighten Before Pressure Application
Install and tighten the thermowell securely before applying process pressure to prevent leaks and ensure proper seating-.

Step 3: Install Sensor Assembly
After the thermowell is secured, screw the temperature sensor (Rosemount 1067 or compatible equivalent) into the thermowell bore. For 3 mm or 6 mm sensor diameters, ensure proper fit and engagement-23.

Step 4: Attach Extension and Adapters
If additional extension length is required, attach necessary extension nipples and adapters. Seal threaded connections appropriately to prevent moisture ingress.

Step 5: Perform Leak Test
After installation and tightening, apply process pressure and perform a leak test at the thermowell penetration point to verify seal integrity.

Best Practices

Insertion Length Rule of Thumb – For standard 1/4-inch (6.35 mm) diameter sensors, the immersion length should be at least 2.5 inches (63.5 mm) to minimize heat loss errors-.

Pipe Penetration Location – Install the thermowell in a location that accurately reflects process temperature and is easily accessible for maintenance-.

Vibration Considerations – For high-flow or high-velocity applications, verify that the thermowell design complies with ASME PTC 19.3 TW frequency and dynamic stress criteria to avoid vortex-induced vibration failures-.

Complete Rosemount 1097 Series Model Number Breakdown

The Rosemount 1097 Thermowell series includes multiple configuration options. Below are representative model number codes for reference:

Note: The above model numbers are representative examples. Actual complete model numbers include additional position codes for insertion length, bore size, flange rating, and certification requirements. Contact Emerson documentation for full model number construction guidelines.

Applications

The Rosemount 1097 Thermowell was historically deployed across a wide spectrum of process industry applications:

Chemical Processing – Protection of temperature sensors in corrosive chemical streams

Petrochemical Refining – High-temperature and high-pressure process monitoring

Oil & Gas Production – Wellhead and pipeline temperature measurement

Power Generation – Boiler and steam system temperature monitoring

Pharmaceutical Manufacturing – Sterile and sanitary process applications (with appropriate material selection)

Replacement and Legacy Support

As the Rosemount 1097 Thermowell is discontinued, customers currently operating legacy installations requiring replacement should:

Contact Local Emerson Representative – For guidance on compatible current-production thermowell alternatives-5

Consult Rosemount Thermowell Portfolio – Emerson offers a comprehensive range of current thermowell products including threaded, flanged, Van Stone, and welded mounting styles with straight, stepped, or tapered stem profiles

Utilize Rosemount Thermowell Design Accelerator – Free online tool for thermowell calculations compliant with ASME PTC 19.3 TW standards, helping select appropriate replacement thermowell configurations–

Compliance and Engineering Standards

The Rosemount 1097 series was designed and manufactured in alignment with internationally recognized standards:

ASME B16.5 – Pipe Flanges and Flanged Fittings (where flanged configurations were specified)

ASME PTC 19.3 TW – Thermowells performance test code providing four quantitative design criteria: Frequency, Dynamic Stress, Steady State Stress, and Hydrostatic Pressure Limits-

CRN – Canadian Registration Number for pressure equipment certification