Rosemount Guide to the Selection of Diaphragm Seals

• Diaphragm Seals are used for the following:

  • The process temperature is outside of the normal operating ranges of the transmitter and cannot be brought into those limits with impulse piping.

  • The process is corrosive and would require frequent transmitter replacement or exotic materials of construction.

  • The process contains suspended solids or is viscous and may plug the impuse piping.

  • There is a need for easier cleaning of the process from the connections to avoid contamination between batches.

  • There is a need to replace wet/dry legs to reduce maintenance on applications where the reference leg is not stable or often needs to be refilled/drained.

• Topics covered in Rosemount Guide:

  •  What is a diaphragm seal system?

  • Temperature Effects

  • Time Response

  • Direct Mount vs. Capillary Systems

  • Balanced Systems vs. Tuned Systems

  • High Temperature and Vacuum Service

  • Fill Fluid Selection Criteria

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