The Rosemount 1299 is a diaphragm seal system designed to protect compatible pressure transmitters in challenging process environments. A diaphragm separates the process medium from the transmitter, while a suitable fill fluid transfers pressure to the measuring instrument. Different seal designs, materials and mounting arrangements allow the system to be tailored to application requirements.
Key Features
- Flanged and threaded diaphragm seal options
- Protects transmitters from corrosive, erosive and extreme-temperature media
- Multiple process connection sizes and industry-specific designs
- Direct-mount and remote-mount configurations
- Tuned, balanced, inline and Coplanar™ system options, depending on application
- Multiple diaphragm and wetted material options
- Optional specialized coatings for demanding process media
- SIL 2/3 certification to IEC 61508 for applicable configurations
- Newer model structure designed to simplify seal system selection
- Threaded connection options rated up to 800 psi, depending on configuration
Suitable Applications
- Chemical and petrochemical processing
- Oil and gas production
- High-temperature and low-temperature processes
- Corrosive or abrasive fluids
- Viscous and clogging media
- Tank level measurement
- Differential pressure measurement
- Industrial pressure monitoring
- Safety-related process instrumentation with suitable certified configurations
Technical Highlights & Selection Considerations
- Seal type: Choose flanged, threaded or application-specific designs.
- Mounting arrangement: Confirm direct mount or remote mount based on process conditions and installation requirements.
- Process connection: Verify connection size, standard and pressure rating.
- Diaphragm material: Select a compatible material based on corrosion, abrasion and process temperature.
- Fill fluid: Confirm compatibility with the operating temperature and required measurement performance.
- Transmitter compatibility: Specify the compatible transmitter model and measurement type.
- Response time: Consider a Tuned-System design when temperature effects and response time are important.
- Certifications: Verify required safety, hygienic and hazardous-area approvals for the complete assembly.
Frequently Asked Questions
Q1: What is the Rosemount 1299 Diaphragm Seal System used for?
It protects compatible pressure transmitters from harsh process media while transferring pressure for measurement. Typical applications include pressure and tank level measurement.
Q2: Why use a diaphragm seal?
A diaphragm seal helps prevent corrosive, abrasive, viscous or extreme-temperature media from directly contacting the transmitter's internal pressure-sensing components.
Q3: What is the difference between direct-mount and remote-mount systems?
A direct-mount system is installed close to the transmitter. A remote-mount system uses a capillary connection to separate the transmitter from the process connection, which can be useful in high-temperature or difficult-to-access installations.
Q4: Which diaphragm materials are available?
Options depend on the selected seal design and may include stainless steel, Alloy C-276, Alloy 400, tantalum and other specialized materials. Confirm compatibility with the process medium.
Q5: Can the Rosemount 1299 be used for tank level measurement?
Yes. When paired with a compatible pressure transmitter and suitable seal arrangement, it can support level measurement in vented or pressurized tanks.
Q6: What information is needed to select the correct system?
Confirm the transmitter model, process connection, pressure and temperature conditions, process medium, diaphragm material, mounting arrangement, fill fluid and required certifications.
