Key Benefits and Advantages
Direct Tank Mounting: The STF800 is designed for direct connection to tank nozzles. This “flush diaphragm” approach prevents process media from hardening or settling in impulse lines, making it the ideal solution for measuring levels in slurries, polymers, and food products.
Automatic Temperature Compensation: Level measurements in tanks can be significantly affected by changes in ambient temperature. The STF800 features integrated temperature sensors that provide real-time compensation for the electronics and the sensor element, ensuring a stable level reading whether it is mid-day in the desert or a freezing winter night.
High-Accuracy Level Measurement: With a reference accuracy of up to 0.0375% of span, the STF800 provides precise hydrostatic head pressure readings. This allows for extremely accurate volume calculations in tanks, which is critical for inventory management and custody transfer applications.
Modular and Interchangeable Components: Like all SmartLine instruments, the STF800 features a modular design. The communication module, display, and electronics can be swapped out in the field without requiring a new pressure test or full recalibration. This lowers maintenance costs and reduces the number of spare parts needed in inventory.
Advanced Graphics and Diagnostics: The optional advanced graphics LCD supports trend reporting and health monitoring. It can display a bar graph of the tank level and provide clear diagnostic messages if it detects issues like a coated diaphragm or a loop power problem.
SIL 2/3 Certified: The STF800 is certified for use in safety-instrumented systems (SIS). It provides the high reliability required for overfill protection loops, ensuring the safety of personnel and the environment.
Technical Properties
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Measurement Type: Hydrostatic Level (Differential Pressure based).
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Reference Accuracy: Up to 0.0375% of span.
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Stability: 0.01% of URL per year for 10 years.
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Turndown Ratio: Up to 100:1.
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Communication: HART 7, DE, FOUNDATION Fieldbus, or PROFIBUS PA.
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Flange Sizes: 2-inch, 3-inch, or 4-inch (ANSI/ASME or DIN).
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Wetted Materials: 316L Stainless Steel, Hastelloy C-276, Monel, or Tantalum.
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Fill Fluids: Silicone Oil, Fluorinated Oil (for Oxygen), or Neobee M-20 (Food Grade).
Field of Application
The STF800 is the standard for liquid level measurement where traditional impulse piping is impractical.
Primary Industries and Uses:
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Chemical & Petrochemical: Level measurement in pressurized reactors or storage spheres.
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Food and Beverage: Hygienic level monitoring in milk, juice, or syrup tanks using food-grade fill fluids.
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Pulp and Paper: Monitoring levels in pulp chests and black liquor tanks where clogging is a risk.
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Oil and Gas: Measuring interface levels in separators and storage tanks.
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Pharmaceutical: Precise volume tracking in fermentation vessels and sterile storage.
