US 11,927,469 B2
Proof test of radar level gauge system
Mikael Inglund, Stora Höga (SE); Tobias Lilja, Sturefors (SE); Tomas Wennerberg, Kållered (SE); Lars-Ove Larsson, Linköping (SE); Pär Abrahamsson, Linköping (SE); and Christian Skaug, Öjersjö (SE)
Assigned to ROSEMOUNT TANK RADAR AB, Mölnlycke (SE)
Appl. No. 17/298,982
Filed by Rosemount Tank Radar AB, Mölnlycke (SE)
PCT Filed Dec. 19, 2018, PCT No. PCT/EP2018/085942
§ 371(c)(1), (2) Date Jun. 2, 2021,
PCT Pub. No. WO2020/125977, PCT Pub. Date Jun. 25, 2020.
Prior Publication US 2022/0065685 A1, Mar. 3, 2022
Int. Cl. G01F 25/20 (2022.01); G01F 23/284 (2006.01)
CPC G01F 25/24 (2022.01) [G01F 23/284 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of proof-testing a radar level gauge system arranged to determine a filling level of a product in a tank, the method comprising the steps of:
transmitting an electromagnetic transmit signal towards a surface of the product in the tank;
receiving an electromagnetic reflection signal resulting from reflection of the transmit signal at the surface of the product;
forming a measurement representation based on the transmit signal and the reflection signal, the measurement representation comprising surface echo information indicative of the filling level of the product;
adding, to the measurement representation, proof test echo information indicative of a predefined proof test level corresponding to, or being higher than, a high level alarm limit of the radar level gauge system, resulting in a modified measurement representation;
processing the modified measurement representation to determine a proof test level based on the modified measurement representation; and
providing a signal indicative of a result of the processing.