Gauging system having wireless capability
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United States of America Patent
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Sep 11, 2012
Grant Date -
Jul 9, 2009
app pub date -
Jan 4, 2008
filing date -
Jan 4, 2008
priority date (Note) -
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Abstract
The present invention relates to 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 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 loop, 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, wherein the power signal is capable of delivering enough regulated power to the wireless communication unit for allowing transmission of RF signals at any given moment.
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