Technical Characteristics and Performance
-
Optimized for Stilling Wells: Measuring inside a pipe presents unique challenges, such as signal interference from the pipe walls or internal rust. The 6 GHz frequency and planar antenna design of the NMR84 are engineered to use the pipe as a waveguide, ensuring the signal remains strong and focused on the liquid surface even over a 40-meter range.
-
Unique Drip-Off Planar Antenna: Condensation is a common cause of measurement drift in tank gauging. The NMR84 features a superior “drip-off” planar antenna design. Its slanted surfaces ensure that moisture and product droplets run off the antenna face, eliminating the risk of signal attenuation or error caused by condensation build-up.
-
Custody Transfer Certification: The device meets the highest global metrological standards, including OIML R85 and API MPMS 3.1B. It holds local high-accuracy certifications like NMi and PTB, making it legally compliant for trade and fiscal billing.
-
Safety and SIL Reliability: Developed according to IEC 61508, the NMR84 is suitable for SIL2 and SIL3 (in homogeneous redundancy) safety loops. This allows the device to serve a dual purpose: high-precision commercial measurement and reliable overfill protection.
-
System Interoperability: The sensor connects seamlessly to major Distributed Control Systems (DCS) and Tank Inventory Systems. By supporting open protocols and various digital interfaces, it simplifies the modernization of older tank farms.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Guided Radar inside Stilling Well |
| Frequency | 6 GHz (C-band) |
| Measuring Range | Up to 40 m (131 ft) |
| Accuracy | ±0.5 mm (±0.02″) |
| Process Temperature | -40 to +150 °C (-40 to +302 °F) |
| Process Pressure | Vacuum to +25 bar (362 psi) |
| Approvals | OIML R85, API 3.1B, NMi, PTB, SIL 2/3 |
| Communication | V1, Modbus RS485, HART |
Primary Applications
-
Fiscal Custody Transfer in Pipes: High-accuracy measurement in tanks where a stilling well is present to protect the surface from turbulence or foam.
-
Floating Roof Tanks: The NMR84 is the standard solution for tanks with internal or external floating roofs, where the radar must measure through a dedicated guide pole or stilling well.
-
Crude Oil and Refined Products: Precise inventory tracking for hydrocarbons where temperature and condensation are prevalent.
-
Chemical Tank Farms: Accurate monitoring of bulk chemicals in pressurized or atmospheric vessels equipped with stilling wells.
-
High-Pressure Storage: Reliable measurement in LPG/LNG or pressurized chemical storage up to 25 bar.
