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Rosemount™ 3051S Thermal Range Expander
The Rosemount 3051S Thermal Range Expander enables transmitters to attach to high temperature processes in order to extend the thermal operating range and improve response time.
Engineered with two different fill fluids, this product eliminates the need for heat tracing. This device can be used in various process applications, and allows for direct and remote mounting, Tuned-System™ assembly and balanced systems.

Rosemount 3051S Series of Instrumentation: Gain the Process Insight to Optimize Every Point

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How to Measure Pressure and Level in Hot Process Applications with the 3051S Thermal Range Expander

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Rosemount™ 3051S Thermal Range Expander


Max. Operating Pressure
Up to 3,750psi (258,6 bar)
Process Temperature Range
Based on fill fluid - Maximum 770°F (410°C), Minimum -157°F (-105°C)
Communication Protocol
4-20 mA HART®, WirelessHART®, FOUNDATION™ Fieldbus
Seal System Type
Direct Mount, Remote Mount, Tuned-System, Balanced System
Transmitter Connection
Welded-Repairable, All Welded
Process Connection

�Threaded: NPT, DIN, ISO

Process Wetted Material
316L SST, Alloy C-276, Alloy 400, Tantalum, Gold-plated Alloy 400, Gold-plated 316L SST, see full specs for complete list of materials
Basic Diagnostics, Loop Integrity, Process Intelligence, Plugged Impulse Line
SIL 2/3 certified to IEC 61508 by an independent 3rd party, NACE®, hazardous location, see full specs for complete list of certifications


  • Seal system with two different fill fluids extends the operating temperature range up to 770 °F (410 °C)
  • Optimized for use in various high process temperature applications and low ambient temperature conditions
  • Eliminates the need for heat tracing and impulse piping which reduces installation costs
  • Operates with process temperatures as low as -157 °F (-105 °C) and high as 770 °F (410 °C) for application adaptability
  • Advanced diagnostics provide diagnostic coverage to detect electrical loop issues and abnormal process conditions
  • Tuned-Systems can reduce temperature effects by 10-20% and improve response time by 80% vs. traditional installations
  • Allows for direct mounting, remote mounting and balanced systems to meet various application requirements
  • SIL 2/3 certified to IEC 61508 (via 3rd party) and prior-use certificate of FMEDA data for safety installations