ROSEMOUNT TANK RADAR AB

A radar level gauge system comprising a transmission line probe; a transceiver coupled to the transmission line probe, the transceiver comprising: a first signal generator connected to the transmission line probe and controllable to generate a transmit signal to include a measurement sweep across frequencies defined by a first frequency and a second frequency; a second signal generator configured to generate an offset signal having a constant frequency lower than the first frequency; a first mixer for mixing the transmit signal and the offset signal to form a first mixer output signal; and a second mixer for mixing the first mixer output signal and the reflection signal to form a second mixer output signal; and processing circuitry coupled to the transceiver and configured to determine the filling level based on the second mixer output signal.

A radar level gauge system, for determining a filling level of a product in a tank, comprises a transceiver, an antenna assembly, and processing. The antenna assembly comprises a dielectric antenna body having a conical external surface facing an interior of the tank and an internal surface facing away from the interior of the tank, when the antenna assembly is arranged at the opening in the tank wall, and an antenna feed coupled to the transceiver, and configured to propagate the transmit signal towards the internal surface of the dielectric antenna body as electromagnetic waves with convex wavefronts. The internal surface of the dielectric antenna body is shaped to refract the transmit signal from the antenna feed in such a way that the transmit signal propagates towards the surface of the product in the tank as electromagnetic waves with substantially planar wavefronts, following passage through the dielectric antenna body.

A method for replacing a first sensor with a second sensor in a field device system configured to determine a process variable, each of the first and second sensor provided with near field communication, NFC, functionality, the method includes: connecting the second sensor to an initiation device and initiating the second sensor based on information uniquely identifying the first sensor; disconnecting the second sensor from the initiation device; placing the second sensor in the vicinity of the first sensor; with the first sensor connected to a power source and the second sensor not connected to a power source, communicatively connecting the sensors via NFC and transferring settings from the first to the second sensor; replacing the first sensor with the second sensor; connecting the first sensor to the initiation device; and transferring a verification from the first sensor to the initiation device confirming that the transfer of settings was completed.

A field device comprising a first loop terminal and a second loop terminal; a measurement unit; a loop current control device for controlling the loop current to encode a process variable determined by the measurement unit, the loop current control device being provided in the electric circuit between the first loop terminal and an a first node of the electric circuit; an asymmetrically conducting device provided in the electric circuit between the first node of the electric circuit and a second node of the electric circuit; an energy storage device in the electric circuit between the second node of the electric circuit and the second loop terminal; and a controllable shunt regulator provided in the electric circuit between the first node of the electric circuit and the second loop terminal, wherein the measurement unit is in the electric circuit between the second node and the second loop terminal.

A field device comprising first and second tines; first and second rods coupled to the first and second tines; a coil arrangement fixed to the first rod; a magnet fixed to the second rod, opposite the coil arrangement; excitation circuitry coupled to the coil arrangement and controllable to provide a time-varying current to the coil arrangement, resulting in vibration of the first tine in relation to the second tine; sensing circuitry coupled to the coil arrangement and configured to provide a sensing signal indicative of a change in at least one property of the vibration of the first tine in relation to the second tine; and measurement control circuitry coupled to the excitation circuitry and the sensing circuitry for controlling operation of the excitation circuitry.

A vibrating fork level sensor probe arrangement for a tank comprising: a first vibrating fork level sensor; a second vibrating fork level sensor; and a pipe configured to hold the first vibrating fork level sensor in a first position and to hold the second vibrating fork level sensor in a second position at a predetermined distance from the first vibrating fork level sensor, wherein the first and second vibrating fork level sensors are configured to determine a location of an interface of a material in the tank.

A level determination system, for determining a level of a material interface in a tank, the level determination system comprising: a transceiver configured to generate, transmit, and receive electromagnetic signals; processing circuitry coupled to the transceiver, and configured to determine the filling level based on a timing relation between an electromagnetic transmit signal and an electromagnetic reflection signal resulting from reflection of the transmit signal at the material interface; and a signal propagation arrangement coupled to the transceiver, and configured to propagate the transmit signal from the transceiver towards the material interface and to propagate the reflection signal towards the transceiver, the signal propagation arrangement having a fluid absorbing surface portion, configured to absorb condensate.

A radar level gauge system comprising a first microwave unit including a transmitter patch for transmitting a first transmit signal, a receiver patch for receiving a first reflection signal, and processing circuitry for determining a first level measurement; a second microwave unit including a transmitter patch for transmitting a second transmit signal, a receiver patch for receiving a second reflection signal, and processing circuitry for determining a second level measurement; an antenna; and a signal coupling arrangement including a first hollow waveguide directional coupler, a second hollow waveguide directional coupler, and a signal combiner.

A microwave transmission arrangement, comprising a microwave circuit board including a patch; microwave transceiver circuitry coupled to the patch; an electrically conductive hollow waveguide arranged to guide microwave signals between a first end and a second end; and a separator sheet sandwiched between the microwave circuit board and the first end of the hollow waveguide, the separator sheet being configured to allow passage of microwaves between the patch and the hollow waveguide through the separator sheet. The separator sheet is included in an encapsulation separating an encapsulated interior of the microwave transmission arrangement from an exterior outside the encapsulation, the patch, and the microwave transceiver circuitry being in the encapsulated interior, and the hollow waveguide being in the exterior outside the encapsulation.

A tank monitoring device for monitoring a first tank containing a first product, the tank monitoring device comprising a memory configured to store chemical compatibility information about the first product; wireless communication circuitry; and a controller configured to: receive, using the wireless communication circuitry, from a tank monitoring device monitoring a second tank, chemical compatibility information about a second product contained in the second tank ( 5 b ); retrieve, from the memory, the chemical compatibility information about the first product; determine, based on the chemical compatibility information about the first product and the chemical compatibility information about the second product, that the first product and the second product are chemically incompatible; and provide an indication that the first product and the second product are chemically incompatible.