Rosemount 2120 Manual: A Comprehensive Guide
Rosemount 2120 vibrating fork liquid level detectors utilize tuning fork technology, suitable for diverse liquid applications, and are detailed in reference manuals and data sheets.
The Rosemount 2120 Level Switch is a robust and reliable point level detection instrument, widely utilized across numerous industries for liquid applications. This device employs vibrating fork technology, offering a versatile solution for diverse process conditions. As a full-featured instrument, the 2120 is designed for virtually all liquids, providing dependable performance and minimizing false alarms.
This manual serves as a comprehensive guide to understanding, installing, operating, and troubleshooting the Rosemount 2120. It details the principles of operation, focusing on the tuning fork design, and provides essential information regarding material compatibility, including options like 316/316L and Alloy C/C-276. Users will find critical specifications, such as fork length options extending up to 157.5 inches (4 meters) with extensions, and flange dimension details. Proper installation and configuration are paramount for optimal performance, and this guide offers detailed instructions to ensure accurate and safe operation.
What is a Vibrating Fork Liquid Level Detector?
A vibrating fork liquid level detector, like the Rosemount 2120, operates on a simple yet effective principle. A tuning fork is driven to vibrate at its natural frequency. When the fork is immersed in a liquid, the vibration is dampened. This change in vibration is detected by the instrument, signaling a liquid level presence.
The 2120 utilizes this principle for reliable point level detection. The device’s short fork length, coupled with available extensions up to 4 meters, allows for adaptability to various vessel heights and process requirements. This technology is inherently robust, unaffected by fluid properties like density, viscosity, or conductivity.
The detector’s design minimizes false trips caused by turbulence, foam, or coating. It’s a preferred solution where traditional float or conductive level sensors may struggle. The Rosemount 2120’s vibrating fork technology provides a consistent and accurate level indication.
Key Features and Benefits of the 2120
The Rosemount 2120 vibrating fork level switch boasts several key features delivering significant benefits. Its robust design, utilizing materials like 316/316L and Alloy C/C-276, ensures compatibility with a wide range of liquids and harsh process conditions. The availability of threaded and flanged mounting options provides installation flexibility.
A major benefit is its suitability for virtually all liquid applications, eliminating the need for multiple level sensing technologies. The short fork length, extendable up to 157.5 inches (4m), accommodates diverse vessel sizes.
Furthermore, the 2120 offers reliable performance unaffected by changes in density, viscosity, or conductivity. Its simple operation and minimal maintenance requirements contribute to reduced lifecycle costs. The device’s inherent robustness minimizes downtime and maximizes process uptime, making it a cost-effective solution.
Technical Specifications
Rosemount 2120 specifications include fork lengths up to 39.4 inches (1000 mm), flange dimensions of 0.9-1.1 inches (23-28 mm), and material options.
Fork Length Options and Dimensions
The Rosemount 2120 level switch offers a versatile range of fork length options to accommodate various vessel sizes and process requirements; Standard lengths are available, alongside extension tubes that can extend the reach up to an impressive 157.5 inches (4 meters). For flanged configurations, the maximum extended length, utilizing a hand-polished option, reaches 39.4 inches (1000 mm).
Dimensions are meticulously provided in both inches and millimeters for ease of integration into existing systems. Fork extension tube diameters vary based on material selection; 316/316L options feature a maximum outside diameter of 0.9 inches (22.8 mm) and 0.85 inches (21.6 mm), while Alloy C/C-276 alternatives maintain similar dimensions. These precise specifications ensure compatibility and reliable performance across a broad spectrum of applications. Careful consideration of these dimensions is crucial during installation and system design.
Material Compatibility (316/316L, Alloy C/C-276)
The Rosemount 2120 vibrating fork level switch demonstrates robust material compatibility, offering both 316/316L stainless steel and Alloy C/C-276 construction options. 316/316L provides excellent resistance to corrosion in a wide array of common process fluids, making it a versatile choice for many applications. However, for highly corrosive environments, or when dealing with particularly aggressive chemicals, Alloy C/C-276 is the preferred material.
Alloy C/C-276 exhibits superior resistance to severe corrosive attack, including pitting and crevice corrosion. The selection of the appropriate material is critical to ensuring long-term reliability and preventing premature failure. Fork extension tubes are also available in these materials, maintaining compatibility throughout the entire wetted parts of the instrument. Consider the specific process fluid when determining the optimal material for your Rosemount 2120 installation.
Flange Dimensions (1/2 in., 1 1/2 in.)
The Rosemount 2120 vibrating fork level switch offers flexibility in mounting configurations, including flanged connections in common sizes. Available flange dimensions include ½ inch and 1 ½ inch options, accommodating various process connections and piping systems. For the ½ inch flange, the approximate outer diameter is 0.9 inches (23 millimeters), while the 1 ½ inch flange measures approximately 1.1 inches (28 millimeters).
These dimensions are crucial for ensuring proper integration with existing plant infrastructure. Precise flange dimensions are essential for a leak-proof and secure installation. Always verify the flange compatibility with your process piping before installation. Detailed dimensional drawings are available in the product data sheets to facilitate accurate planning and implementation of the Rosemount 2120 within your application.
Installation Guidelines
Rosemount 2120 installation requires careful consideration of mounting options – threaded or flanged – and appropriate fork extension tube selection for optimal performance.
Mounting Considerations (Threaded vs. Flanged)
Rosemount 2120 level switches offer versatile mounting options, primarily threaded or flanged connections, each suited to specific application requirements. Threaded connections are generally preferred for simpler installations and lower-pressure systems, providing a cost-effective and straightforward solution. However, flanged connections are recommended for higher-pressure applications and larger vessel sizes, ensuring a robust and secure seal.
When selecting a mounting style, consider the process fluid, temperature, and pressure. Flanged connections, available in 1/2 in. and 1 1/2 in. sizes, offer enhanced stability and are less susceptible to vibration. The choice also impacts fork length considerations; extended forks may require additional support. Proper torque specifications must be adhered to during installation, regardless of the chosen method, to prevent leaks or damage to the instrument. Always consult the detailed installation instructions provided with the Rosemount 2120 for specific guidance.
Fork Extension Tube Selection
Rosemount 2120 level switches frequently utilize fork extension tubes to accommodate vessels with limited access or to reach the desired measurement point. These extensions, available in materials like 316/316L stainless steel and Alloy C/C-276, ensure compatibility with various process fluids. Careful selection is crucial for optimal performance and longevity.
The maximum outer diameter (O/D) of the extension tube is dependent on the flange size; up to 1-inch flanges accommodate a .9 inch (23mm) O/D, while 1 1/2-inch flanges support a larger .11 inch (28mm) O/D. Extensions can reach lengths up to 157.5 inches (4 meters) with short fork models. When choosing, consider the fluid’s viscosity and density, as longer extensions can be affected by fluid dynamics. Ensure the selected tube material is chemically compatible with the process fluid to prevent corrosion or failure. Refer to the manual for detailed compatibility charts and installation guidelines.
Wiring and Electrical Connections
Rosemount 2120 level switches offer relay output configuration for straightforward integration into control systems. Proper wiring and electrical connections are vital for reliable operation and accurate level detection. Ensure power supply voltage matches the switch’s specifications, typically indicated on the device’s nameplate.
Wiring should adhere to local and national electrical codes. Typically, connections involve power (supply voltage), relay output (for level indication), and potentially grounding. The relay output can be configured for normally open (NO) or normally closed (NC) operation, depending on the application’s requirements. Double-check all connections for tightness and polarity before energizing the device; Incorrect wiring can lead to malfunction or damage. Consult the detailed wiring diagrams provided in the product manual for specific connection instructions and safety precautions.
Operation and Configuration
The Rosemount 2120 operates on a tuning fork principle, and configuration of the relay output is crucial for proper application and reliable liquid detection.
Tuning Fork Principle of Operation
The Rosemount 2120 level switch employs a sophisticated tuning fork principle for reliable liquid level detection. At the heart of its operation lies a precisely tuned, two-pronged fork that is constantly driven to vibrate at its natural resonant frequency. When the fork is exposed to a liquid, the energy transfer between the fork and the liquid causes a significant decrease in the vibration amplitude.
This change in vibration is continuously monitored by the instrument’s internal circuitry. A dedicated electronic module detects this damping of the vibration and triggers the switch output – typically a relay – to change state. This provides a clear indication of liquid presence or absence. The design ensures sensitivity and responsiveness, even with varying liquid densities and viscosities.
Because the detection is based on physical vibration damping, the Rosemount 2120 is largely unaffected by fluid properties like conductivity, specific gravity, or coating. This makes it a versatile solution for a wide range of challenging applications.
Relay Output Configuration
The Rosemount 2120 level switch commonly features a Single Pole Double Throw (SPDT) relay output, providing versatile switching capabilities for various control system integrations. This relay can be configured for either normally open (NO) or normally closed (NC) operation, adapting to diverse application requirements. The relay contacts are rated for a specific voltage and current, ensuring compatibility with connected devices.
Configuration of the relay’s function – whether it energizes or de-energizes upon level detection – is typically achieved through internal jumpers or software settings, depending on the specific model. Proper wiring is crucial; the common terminal connects to the power supply, while the NO and NC terminals provide the switched output.
Users should consult the detailed wiring diagrams in the product manual to ensure correct connection and avoid damaging the instrument or connected equipment. The relay output facilitates seamless integration with PLCs, alarms, and other control systems.
Application Examples (Liquids)
The Rosemount 2120 vibrating fork level switch excels in a broad spectrum of liquid level detection applications. It’s frequently employed in storage tanks, process vessels, and boilers to monitor levels of water, chemicals, solvents, and various other liquids. Its robust design makes it suitable for challenging environments, including those with high temperatures, pressures, and densities.
Specific examples include overfill prevention in storage tanks, pump protection by preventing dry running, and level control in mixing or batching processes. The 2120’s compatibility with diverse liquids, coupled with its adjustable sensitivity, ensures reliable performance across a wide range of applications.
Furthermore, it’s often used in applications requiring functional safety, such as SIL 2 rated systems, providing critical level monitoring for safety-critical processes. The short fork length options, with extensions up to 4 meters, enhance its adaptability to various vessel sizes and configurations.
Troubleshooting
Rosemount 2120 issues often involve wiring checks, relay output verification, and ensuring proper tuning for the specific liquid application, as detailed in manuals.
Common Issues and Solutions
Rosemount 2120 troubleshooting frequently involves addressing issues with detection reliability. A common problem is coating buildup on the fork, leading to false readings; regular cleaning resolves this. Incorrect tuning for the liquid’s properties can also cause failures – re-tuning is essential.
Electrical connection problems, such as loose wiring or incorrect relay configurations, are often the source of malfunction. Verify wiring diagrams and relay settings. If the switch fails to indicate a level change, check for power supply issues or a faulty switch.
For extended fork lengths (up to 157.5 in / 4 m), ensure mechanical stability to prevent false trips. Material incompatibility can cause corrosion; confirm compatibility with the process liquid. Refer to the manual for detailed diagnostic steps and specific error codes, aiding in efficient problem resolution.
Diagnostic Information
Rosemount 2120 diagnostic capabilities center around relay output status and operational verification. A stable relay output indicates proper liquid level detection, while fluctuations suggest coating, vibration, or improper tuning. The manual details specific error codes, assisting in pinpointing the root cause of issues.
Monitoring the switch’s response to level changes is crucial. A delayed or absent response signals potential problems with the fork, wiring, or power supply. Checking the fork’s vibration frequency confirms its operational status; deviations indicate fouling or damage.
Reviewing revision history (ECO information) ensures the device’s firmware and configuration are up-to-date. Detailed logs, if available, provide a historical record of switch performance, aiding in trend analysis and proactive maintenance. Always consult the reference manual for comprehensive diagnostic procedures.
Revision History and ECO Information
Rosemount 2120 documentation, including manuals and data sheets, undergoes periodic revisions denoted by revision numbers (Rev GE, Rev EB) and Engineering Change Orders (ECOs). These updates reflect design improvements, clarified procedures, and corrections to previously published information.
The revision table, often found within the manual, details each change, the ECO number associated with it, the approving engineer, and the date of the revision. Understanding this history is vital for ensuring you’re utilizing the most current and accurate information for installation, operation, and troubleshooting.
Always refer to the latest revision of the manual to benefit from the most up-to-date guidance. Older revisions may contain inaccuracies or outdated recommendations. ECO information provides context for the changes, explaining the rationale behind updates and their impact on device functionality.
Safety Precautions
Rosemount 2120 requires careful handling and maintenance; always follow established safety procedures to prevent damage or injury during installation and operation.
Handling and Maintenance
Rosemount 2120 level switches demand careful handling to ensure optimal performance and longevity. During installation, avoid dropping or impacting the device, as this could compromise its internal components and calibration. Regularly inspect the fork for any signs of coating or buildup, particularly in applications involving viscous or particulate-laden liquids.
Cleaning should be performed with a soft cloth and appropriate solvent, avoiding abrasive materials that could damage the fork’s surface. When replacing components, always use genuine Rosemount parts to maintain the device’s integrity and warranty. Electrical connections should be checked periodically for tightness and corrosion.
Proper maintenance extends the lifespan of the 2120, minimizing downtime and ensuring accurate level detection. Refer to the full manual for detailed instructions on specific maintenance procedures and troubleshooting steps. Always disconnect power before performing any maintenance activities.
Emerson Trademark Information
Emerson Electric Co. holds extensive trademark and service mark rights, protecting its brand identity and innovative technologies. The Emerson logo itself is a registered trademark, signifying the company’s commitment to quality and reliability. Within the automation solutions landscape, Rosemount is a highly recognized and registered trademark of Rosemount Inc., a key business unit of Emerson.
The Rosemount logotype, instantly identifiable in industrial settings, further reinforces the brand’s reputation for precision and performance. These trademarks are legally protected and cannot be used without explicit authorization from Emerson.
This Rosemount 2120 manual and associated documentation prominently feature these trademarks to acknowledge Emerson’s ownership and to ensure clarity regarding the product’s origin and quality. Unauthorized use of these marks is strictly prohibited and may result in legal action.
