Patent ID: 11927469
Assignee: ROSEMOUNT TANK RADAR AB
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. A method of operating a radar level gauge system arranged to determine a filling level of a product in a tank, the radar level gauge system being controllable between a filling level measuring state and a proof test state, wherein the method comprises the steps of:
receiving a state signal indicating a desired state of the radar level gauge system;
when the state signal indicates the filling level measuring state:
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; and
determining the filling level based on the measurement representation; and
when the state signal indicates the proof test state:
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, 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.