The Rosemount 2140 is an advanced vibrating fork level detector that identifies wet and dry conditions by monitoring changes in the fork's natural vibration frequency. When liquid contacts the fork, the frequency changes and the detector updates its output, providing a switching signal for process monitoring, alarms, and protective actions.
Unlike conventional point-level switches, the Rosemount 2140 combines wired HART communication with diagnostic functions that monitor electronic and mechanical device health. Its remote proof-testing capability can help reduce the need for personnel to access tanks or elevated installation points. The device also supports liquid-to-sediment detection and Media Learn functionality to help optimize switching performance when process media characteristics are uncertain.
Key Features
- Vibrating fork technology for dependable wet/dry level detection
- Wired HART® communication for integration with existing instrument loops
- Continuous diagnostics to monitor electronic and mechanical device health
- Remote proof-testing capability to support safer and more efficient maintenance
- SIL 2 certification for the Rosemount 2140 version
- Liquid-to-sediment detection for selected separation and process applications
- Media Learn functionality to optimize switching points for different media
- Fast-drip short-fork design for rapid response and reduced material buildup
- Reliable switching in viscous or sticky liquids, subject to process conditions
- Flexible mounting orientation for suitable top, bottom, or side installations
- Optional Smart Diagnostics Suite for enhanced monitoring and configurable process alerts
- HART 5 and HART 7 support, depending on configuration
Suitable Applications
- Tank overfill prevention
- High-high and low-level alarms
- Pump protection
- Oil and gas separators
- Chemical and petrochemical processing
- Refinery process vessels
- Liquid storage tanks
- Wet sediment detection
- Slurry and separator monitoring
- Viscous liquid applications
- Safety instrumented systems
- Remote instrument diagnostics and maintenance
Technical Highlights & Selection Considerations
- Detection principle: The fork's vibration frequency changes when it contacts liquid or moves between wet and dry conditions.
- Communication: Wired HART communication supports configuration and process integration. Confirm the HART revision and control-system compatibility.
- Process temperature: Standard configurations support approximately −40 to 150°C (−40 to 302°F), with selected options extending to −70 to 260°C (−94 to 500°F). Confirm the limits of the exact configuration.
- Process pressure: The product data sheet lists operation from full vacuum up to 100 bar (approximately 1,450 psi) at 50°C (122°F) for applicable configurations. Check the pressure-temperature limits for the selected process connection.
- Media compatibility: The detector is designed for a wide range of liquids. Confirm wetted-material compatibility and suitability for the actual process medium.
- Sediment detection: The standard Rosemount 2140 supports specific liquid-to-sediment detection functions. Verify the required function and configuration for the application.
- Diagnostics: Enhanced features such as frequency profiling, power advisory, and configurable process alerts may require the optional Smart Diagnostics Suite.
- Remote proof-testing: Availability and supported test functions depend on the model. Remote partial proof-testing is associated with the Rosemount 2140 configuration.
- Safety certification: SIL 2 certification applies to the Rosemount 2140. Confirm the certification, proof-test requirements, and suitability for the complete safety instrumented function.
- Hazardous areas: ATEX, IECEx, and regional approvals are available for selected configurations. Verify the required certification before ordering.
Frequently Asked Questions
Q1: What is the Rosemount 2140 used for?
It detects liquid level conditions for overfill prevention, high- and low-level alarms, pump protection, and other industrial process applications.
Q2: How does the Rosemount 2140 work?
It monitors the natural vibration frequency of a fork. When liquid contacts or leaves the fork, the frequency changes and the detector identifies the corresponding wet or dry condition.
Q3: What is the advantage of wired HART communication?
Wired HART enables the detector to integrate with compatible control systems for configuration, device information, and diagnostic communication without requiring a separate communication wiring network.
Q4: Can the Rosemount 2140 detect sediment?
The Rosemount 2140 includes liquid-to-sediment detection capabilities for selected applications. Confirm the required detection mode and suitability for the specific sediment or process medium.
Q5: Does the Rosemount 2140 support remote proof-testing?
Yes. It offers integrated remote proof-testing capabilities. The available test functions depend on the model, and remote partial proof-testing is supported by the 2140 version.
Q6: Is the Rosemount 2140 suitable for safety-critical applications?
The Rosemount 2140 is certified to IEC 61508 for SIL 2 applications. The exact model must be selected, installed, configured, and proof-tested according to the manufacturer's safety documentation.
