Technical Characteristics and Enhanced Performance
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Extreme Pressure Resilience: Unlike many level technologies, the NMS81 is designed to operate reliably at pressures up to 25 bar (362 psi), making it the ideal choice for pressurized storage spheres and high-pressure chemical reactors.
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Superior Corrosion Resistance: Constructed with 316L materials for all process-wetted parts, the NMS81 is specifically designed for sour applications, such as crude oil containing high levels of hydrogen sulfide (H2S).
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LNG and LPG Optimization: The servo-displacer principle is a best fit for liquefied gas. Because the measurement is mechanical and buoyancy-based, it is completely independent of the dielectric constant (dc) of the liquid or the presence of Boil-Off Gas (BOG) in the vapor space.
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High-Accuracy Density Profiling: The intelligent servo motor can be programmed to move the displacer through the entire liquid column, providing a precise density profile. This helps detect stratification in large storage tanks and ensures product homogeneity.
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Safety Integrity: Developed according to IEC 61508, the NMS81 supports SIL3 safety loops (in homogeneous redundancy), providing maximum protection for overfill prevention and high-level alarms.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Servo-controlled displacer |
| Accuracy | ±0.4 mm (±0.02″) |
| Measuring Range | Up to 47 m (154 ft) |
| Process Temperature | -200 to +200 °C (-328 to +392 °F) |
| Process Pressure | 0 to 25 bar (0 to 362 psi) |
| Safety / Custody | SIL2/3, OIML R85, API 3.1B, NMi, PTB |
| Material | 316L Stainless Steel (Process-wetted) |
Primary Applications
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LNG/LPG Terminals: Precise level and density measurement in cryogenic storage where high accuracy is required for massive financial transactions.
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Sour Crude Storage: Inventory control in tanks containing aggressive, corrosive crude oils where material durability is a priority.
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High-Pressure Chemical Storage: Level monitoring in pressurized vessels where standard radar or float gauges may reach their pressure limits.
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Deep Tanks and Silos: Continuous measurement in very tall tanks (up to 47m) where high precision must be maintained over a large vertical span.
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Multi-Layer Interface Management: Distinguishing between multiple liquid layers (e.g., water, emulsion, and oil) in high-pressure separators.
