Patent ID: 8280317

Claim:
A process control system comprising: a field device comprising a first terminal, a second terminal, a first conduit and a second conduit; a wireless adapter comprising a first terminal, a second terminal, a first port and a second port, wherein the first conduit of the field device couples to the second port of the wireless adapter such that the wireless adapter is located at a position downstream from the field device; a first wire passing between the wireless adapter and the field device connecting the first terminal of the wireless adapter to the first terminal of the field device; a second wire passing between the wireless adapter and the field device connecting the second terminal of the wireless adapter to the second terminal of the field device; a process controller located at a position upstream from the field device; and a third wire connected to the third terminal of the wireless adapter and configured to pass to the process controller; wherein the wireless adapter further comprises a third terminal and a fourth terminal.