First 79GHz radar instrument

The new Micropilot NMR81 for high-accuracy custody transfer applications is certified by independent test authorities to an accuracy of ±0.5mm. The sharply focused microwave beam angle ensures safe and reliable measurements without any interfering signals even in narrow tanks with baffles. 

Micropilot NMR81 uses 79GHz technology to generate a narrow beam angle of 3 or 4°. Measurements are said to be more reliable even in narrow tanks because the radar beam avoids obstacles such as baffles on the tank walls, and is thus unhindered by interfering signals. 

Taking measurements at the bottom of very tall tanks is easier because the beam does not hit the tank walls prematurely. Installation relatively close to the tank wall is possible with the narrow beam angle. The technology permits measuring ranges to 70m and, in custody transfer, the instrument measures to 30m with an accuracy of ±0.5mm.

Custody transfer applications require the highest measurement performance. The American Petroleum Institute (API) and International Organization of Legal Metrology (OIML) recommend an accuracy of 1mm (1/16in) for a level instrument under factory calibration conditions, and within 4mm (3/16in) for the entire measurement system after installation in the tank. Micropilot NMR81 easily fulfills all API and OIML requirements. Additionally, the antenna is equipped with a gas-tight feed-through. This ‘second line of defence’ is particularly important for handling highly toxic or diffusive products.