Patent ID: 8264373

Claim:
A gauging system, comprising: a gauge configured to sense a process variable and to provide process data representative of the process variable; a processing unit connected to the gauge, the processing unit comprising: power supply circuitry configured to receive power from a remote external power source other than a two-wire control loop and to provide regulated power; and first circuitry configured to receive process data from the gauge and to superimpose the process data onto the regulated power forming a power signal; and a wireless communication unit electrically connected to the processing unit by means of a two-wire control interface, the wireless communication unit comprising: second circuitry configured to receive the power signal and to separate the process data from the regulated power; an antenna; and radio frequency (RF) communication circuitry being powered by means of the regulated power from the second circuitry, configured to receive process data from the second circuitry, and to transmit RF signals representative of the process data using the antenna.