Patent ID: 7498974

Claim:
A radar level gauge using electromagnetic waves for determining a process variable of a product in a tank, comprising: transceiver circuitry for transmitting and receiving electromagnetic waves; a propagation device connected to said transceiver circuitry and that directs electromagnetic waves towards a surface of said product and to return electromagnetic waves reflected by said surface; timing circuitry that provides timing control to said transceiver circuitry; processing circuitry connected to said transceiver circuitry that determines said process variable based on a relation between transmitted and reflected waves; a communication interface that receives power in an intrinsically safe manner and connects externally of said radar level gauge; and an isolation interface that galvanically isolates said transceiver circuitry from said timing circuitry and said communication interface, wherein said isolation interface transfers power and the timing control from said timing circuitry and said communication interface to said transceiver circuitry.