Wireless communication adapter for field devices

A wireless process communication adapter coupleable to a field device, the wireless process communication adapter having:

• a housing having a plurality of openings;
• an end cap coupled to a first opening of the plurality of openings;
• a field device coupling disposed at a second of the plurality of openings, the field device coupling configured to mount to a housing of the field device;
• wherein the housing, end cap and field device coupling define a chamber therein;
• at least one circuit board disposed within the chamber, the circuit board having wireless communication circuitry and being coupleable to a two-wire process communication loop and at least one additional wired connection coupleable to transmitter circuitry of the field device by a plurality of discrete wires passing through the field device coupling;
• and
• wherein the chamber is completely filled with a solid material;
• and
• wherein the field device coupling includes an explosion-proof barrier and wherein the explosion-proof barrier includes a pressure-blocking feedthrough.