Selecting the Rosemount 3051 for High-Temperature Applications: Key Considerations

When it comes to process automation, the Rosemount 3051 Pressure Transmitter is a trusted workhorse across industries. But when your application involves high-temperature conditions, careful selection and configuration become critical to ensure long-term reliability, accuracy, and safety.

In this article, we’ll explore the key factors to consider when specifying the Rosemount 3051 for high-temperature service.

1. Understand the Temperature Limits

• Electronics operating range: Standard Rosemount 3051 transmitters typically operate up to around 85 °C (185 °F) ambient.
• Process temperature range: With appropriate remote seals or capillaries, the transmitter can handle process temperatures exceeding 400 °C (752 °F).
• Always check the datasheet and reference manual for the exact model and configuration you plan to use Emerson ManualsLib.

2. Use Remote Seals for Extreme Heat

Direct mounting on high-temperature lines can damage the transmitter electronics.

• Remote diaphragm seals with capillary systems isolate the transmitter from the hot process.
• Fill fluids inside the capillary are selected based on temperature stability (e.g., silicone oil, halocarbon, or inert fluids).
• Proper seal design prevents heat transfer while maintaining accurate pressure transmission.

3. Material Selection Matters

• Diaphragm materials (316L SS, Hastelloy, Monel, Tantalum) must be chosen based on both temperature resistance and process media compatibility.
• For corrosive and hot media, Hastelloy C-276 or Tantalum diaphragms are often recommended.
• The flange and wetted parts should also be matched to the process conditions.

4. Mounting and Installation Practices

• Capillary length: Longer capillaries reduce heat transfer but may introduce response lag.
• Heat dissipation accessories: Cooling elements or heat sinks can be added between the process and transmitter.
• Orientation: Avoid direct exposure of the electronics housing to radiant heat sources.

5. Calibration and Accuracy

1. High temperatures can cause fluid expansion and zero drift.
2. Always perform a zero trim after installation at operating temperature.
3. Consider using advanced diagnostics available in the Rosemount 3051 to monitor performance over time.

6. Certification and Compliance

• For industries like oil & gas, chemical, and power generation, ensure the selected configuration meets safety certifications (ATEX, IECEx, SIL).
• High-temperature service often overlaps with hazardous area requirements, making compliance essential.

Conclusion

The Rosemount 3051 is highly adaptable, but high-temperature applications demand careful attention to seal systems, fill fluids, materials, and installation practices. By selecting the right configuration, you can ensure long-term stability, accuracy, and safety in even the harshest environments.

If you’re planning a project involving high-temperature service, consult the official Emerson datasheet and reference manual for detailed specifications Emerson ManualsLib—and work closely with your supplier to configure the optimal solution.