Patent ID: 8485040

Claim:
A process transmitter for sensing a process variable, the process transmitter comprising: a transmitter housing having an interior; a sensor disposed within the interior for sensing a process variable of an industrial process and generating a sensor signal; transmitter circuitry disposed within the interior and connected to the sensor; a passageway in communication with the sensor and extending through the interior of the transmitter housing, the passageway having a first cross-sectional profile; and a flame arrestor fabricated of bar stock and positioned in the passageway, the flame arrestor having a second cross-sectional profile different from the first cross-sectional profile; wherein the second cross-sectional profile comprises a hexagonal shape; and wherein the flame arrestor produces a path in an interior of the passageway having a smaller cross-sectional area than that of the first cross-sectional profile of the passageway.