The Rosemount 3308 is a wireless level transmitter designed for continuous liquid level and interface measurement. It uses time-domain reflectometry (TDR), guiding low-power radar pulses along a probe to detect the product surface or interface. Its wireless architecture supports remote monitoring in installations where conventional cabling is costly or impractical.
Key Features
- Wireless guided wave radar measurement
- WirelessHART® communication
- Liquid level and liquid-liquid interface measurement
- Reference accuracy up to ±3 mm for the high-performance version under specified conditions
- Direct Switch Technology for enhanced signal strength
- Advanced diagnostics and remote access to process data
- No moving parts and no routine recalibration required under normal operating conditions
- Multiple probe options, including rigid, segmented, flexible, coaxial and PTFE-coated designs
- Battery-powered operation, with battery life dependent on update rate and network conditions
Suitable Applications
- Oil and gas production facilities
- Chemical and petrochemical plants
- Remote tank level monitoring
- Liquid-liquid interface measurement
- Industrial storage tanks and vessels
- Locations where signal wiring is difficult or expensive
- Process monitoring in distributed installations
- Selected challenging liquid measurement applications
Technical Highlights & Selection Considerations
- Measurement type: Confirm whether level measurement or interface measurement is required.
- Accuracy class: Select standard or high-performance configuration according to measurement requirements.
- Probe type and length: Choose a compatible probe based on vessel geometry, installation space and process conditions.
- Process temperature: The listed process temperature range is -40 to 150°C (-40 to 302°F); verify the selected configuration.
- Pressure rating: The product family supports pressure up to 40 bar (580 psi) under specified conditions.
- Media properties: Check dielectric properties and interface conditions to confirm measurement suitability.
- Wireless network: Confirm WirelessHART® network coverage, gateway compatibility and update-rate requirements.
- Battery life: Expected service life depends on measurement update rate, network configuration and operating conditions.
- Process connection: Verify flange or threaded connection dimensions and required materials.
Frequently Asked Questions
Q1: What is the Rosemount 3308 used for?
It provides continuous measurement of liquid level and, with a suitable configuration, liquid-liquid interfaces in industrial tanks and vessels.
Q2: How does the Rosemount 3308 measure level?
It sends radar pulses along a probe. The transmitter analyzes the reflected signals to determine the distance to the liquid surface or interface.
Q3: Does the Rosemount 3308 require signal wiring?
No conventional signal wiring is required for communication because it uses WirelessHART®. The transmitter uses a power module, whose service life depends on operating and network conditions.
Q4: What is the measurement accuracy?
The high-performance version specifies reference accuracy up to ±3 mm under defined conditions. The standard version has different performance specifications.
Q5: Can it measure the interface between two liquids?
Yes, provided the liquids have suitable dielectric properties and the selected probe and configuration meet the application requirements.
Q6: What information is needed to select the correct model?
Confirm the measurement type, required range, probe design and length, process connection, operating temperature and pressure, media properties, wireless network requirements and necessary approvals.
