ROSEMOUNT 1151LT level transmitter

Rosemount 1151LT Level Transmitter Overview

Rosemount 1151LT Level Transmitter Overview a classic product from Emerson’s Rosemount brand, is specifically designed for liquid level measurement. Widely used in industries such as oil and gas, power generation, water treatment, and pharmaceuticals, its reliability and cost-effectiveness make it an ideal choice for low-to-medium pressure liquid level applications.

Key Features

Measurement Principle
Utilizes capacitive sensing technology to detect process pressure acting on an isolation diaphragm, converting it into a standardized 4-20mA output signal. Offers strong resistance to vibration and overpressure.

Measurement Range

Span: 0-1.25 kPa to 0-6.89 MPa (model-dependent).

Supports level, density, or interface measurement with flange or threaded mounting options.

Accuracy & Stability

Typical accuracy: ±0.2% of span (includes linearity, hysteresis, and repeatability).

Exceptional long-term stability with annual drift less than ±0.1%.

Environmental Robustness

Operating temperature: -40°C to +85°C (electronics); process temperature depends on diaphragm material.

IP67 protection rating for harsh industrial environments.

Diaphragm materials include 316L stainless steel, Hastelloy®, and others for corrosive media compatibility.

Output & Communication

Standard 4-20mA analog output with optional HART® protocol for digital communication and remote configuration.

Typical Applications

Tank Level Monitoring: Continuous level measurement in atmospheric or low-pressure tanks.

Interface Detection: Differentiation between immiscible liquids (e.g., oil-water separation).

Density Measurement: Calculates medium density via differential pressure principles.

Industry Use Cases: Refinery storage tanks, chemical reactor vessels, wastewater treatment basins, etc.

Installation & Selection Guidelines

Installation

Ensure seal integrity for flange-mounted installations; follow torque specifications for threaded connections.

Avoid areas with excessive vibration or rapid temperature fluctuations; install heat sinks or isolation valves if necessary.

Media Compatibility

Use flush diaphragms or cleaning rings for viscous or crystallizing media.

Select Hastelloy C-276 or tantalum diaphragms for highly corrosive fluids.

Calibration & Maintenance

Field-adjustable zero/span; quick configuration via HART communicators (e.g., Rosemount 475).

Regularly inspect diaphragms for deformation/blockage and ensure impulse piping remains unobstructed.

Advantages & Limitations

Advantages:

Cost-effective with low maintenance requirements.

Rugged construction ensures long-term stability.

HART compatibility for seamless DCS/PLC integration.

Limitations:

Basic functionality compared to Rosemount 3051 series (non-smart versions).

Diaphragm material limits apply in extreme temperatures or ultra-high-pressure environments.

Conclusion

The Rosemount 1151LT remains a trusted solution for industrial level measurement due to its proven design and reliability. It offers an economical option for stable operating conditions with moderate performance requirements. Proper selection requires evaluating media properties, environmental factors, and communication needs. Consult manufacturer guidelines or technical support for optimal configuration.

For additional details (e.g., wiring diagrams, fault codes, or comparisons with Rosemount 3051), specify requirements for further expansion.

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