Rosemount 306 In-Line Instrument Manifold

• Model Series: Rosemount 306
• Manufacturer: Emerson Process Management (Rosemount)
• Product Type: In-Line Instrument Manifold

Product Description of Rosemount 306 In-Line Manifold

The Rosemount 306 In-Line Instrument Manifold is a precision-engineered manifold used for isolating, equalizing, venting, and calibrating differential pressure and flow instruments. It provides reliable pressure connections between process lines and field transmitters, improving safety, stability, and measurement accuracy in industrial process control systems.

Key Features of Rosemount 306 In-Line Instrument Manifold

• Designed for direct inline mounting with differential pressure instruments
• Robust corrosion-resistant construction for harsh industrial environments
• Integrated valves for isolation, equalization, venting, and calibration
• Compact, modular configuration supports easy installation and service
• Compatible with Rosemount pressure transmitters and most industry-standard devices
• Minimizes process fluid leakage and improves system safety

Technical Specifications of Rosemount 306 In-Line Manifold

Parameter	Description
Model	Rosemount 306 In-Line Instrument Manifold
Manufacturer	Emerson Process Management / Rosemount
Material of Construction	Stainless Steel (316/316L typical)
Number of Valves	Configurations: 3-valve, 5-valve (depend on model)
Valve Type	Needle valves with blow-out proof stem
Connections (Process)	Threaded (e.g., 1/4″–1/2″ NPT/BSP) or Flanged (ANSI/DIN standards)
Test Port Connections	Standard test ports for calibration
Maximum Working Pressure (MWP)	Up to 6,000 psi (413 bar) depending on model and connection
Temperature Range	−40°C to +200°C (depends on seals and materials)
Seal Material	PTFE/Graphite (standard), optional elastomers
Design Standard	ASME B31.3 / ANSI compliance
Surface Finish	Machined and passivated per industry specification
Mounting	Direct inline with transmitter or panel mountable
Weight	Varies by configuration and materials

 

Functional Description of Rosemount 306 In-Line Manifold

The Rosemount 306 In-Line Instrument Manifold integrates multiple valve functions into a single assembly:

• Isolation Valves: Shut off process fluid from the transmitter for maintenance.
• Equalization Valve: Balances pressure across high/low sides before removal or calibration.
• Vent/Drain Ports: Enables safe venting of trapped pressure for zeroing or calibration.
• Test Ports: Provides access for field calibration without disconnecting lines.

This integrated design reduces piping, improves safety, and enhances instrument performance.

Application Areas

The Rosemount 306 manifold is ideal for:

• Differential pressure measurement
• Flow measurement (orifice, venturi, DP flow sensors)
• Level measurement in pressurized vessels
• Industrial automation instrumentation
• Chemical, petrochemical, power generation, and oil & gas facilities

Installation and Mounting

Recommended best practices:

• Mount the manifold securely with proper support to prevent vibration transmission to instruments
• Align process connections accurately; avoid strain on valves
• Ensure valve positions are clearly labeled for isolation, equalization, venting
• Use proper torque values on fittings to avoid leaks
• Test operation before integrating with control systems

Materials and Corrosion Resistance

Standard construction materials are selected to provide long service life in corrosive environments:

• Body: 316/316L Stainless Steel for excellent corrosion resistance
• Seals: PTFE, Graphite, or optional high-temperature versions
• Valves: Precision needle valves designed for high cycle life

Optional materials available for specific corrosive services (e.g., Hastelloy).

Testing and Quality Assurance

Each manifold is:

• Pressure tested at the factory
• Inspected for leakage and valve operation
• Supplied with test certificates (as required)
• Marked with model and serial number for traceability

Packaging and Shipping

• Secured in protective packaging
• Includes:
  • Product label & serial plate
  • Installation instructions
  • Valve operation guide
  • Material and test certification (if requested)
• Available in single or bulk packaging

Warranty

Backed by the manufacturer’s standard warranty covering defects in material and workmanship for a defined period (typically 12 months or per contract terms).