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Rosemount™ 1199 Diaphragm Seal System
The Rosemount 1199 Diaphragm Seal System offers protection to transmitters, guarding against hot and cold, corrosive or erosive processes.
This seal system features a variety of solutions, including industry-specific seals for difficult processes. This safety certified system does not require mounting hardware and can be used for many pressure measurement applications, providing reliable, remote measurements.
Rosemount™ 1199 Diaphragm Seal System


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, CorrosionShield PFA coated 316 SST, see PDS for full list of materials
SIL 2/3 certified to IEC 61508 by an independent 3rd party, 3A, NACE®, hazardous location, see PDS for full list of certifications


  • Protects transmitter diaphragm from corrosive, erosive or extreme temperature processes
  • Wide variety of seals meet varying process requirements and specifications, including industry-specific applications
  • SIL 2/3 certified to IEC 61508 (via 3rd party) and prior-use certificate of FMEDA data for safety installations
  • Eliminates need for mounting hardware to reduce installation costs
  • Adaptable direct mount gage or absolute seal system can be used for pressurized or vented tank applications
  • Tuned-Systems can reduce temperature effects by 10-20% and improve response time by 80% vs. traditional installations