Flameproof housing with display

1. A flameproof housing ( 202 ), comprising:

a display aperture ( 212 ) formed in the flameproof housing ( 202 );

a shoulder ( 207 ) adjacent to the display aperture ( 212 );

a transparent panel ( 230 ) including an outer face ( 231 ) and a perimeter ( 232 ); and

a fastener element ( 236 ) configured to threadingly engage an interior surface ( 203 ) of the flameproof housing ( 202 ) by engaging an internal housing fastener feature ( 204 ) on an interior surface ( 203 ) of the housing ( 202 ) and clamp the transparent panel ( 230 ) against the shoulder ( 207 );

wherein a perimeter interface region ( 264 ) between the perimeter ( 232 ) of the transparent panel ( 230 ) and the interior surface ( 203 ) of the flameproof housing ( 202 ) creates a perimeter gap, inclusive of the internal housing fastener feature ( 204 ), that does not exceed a predetermined flameproof gap limit and wherein a face interface region ( 260 ) between the outer face ( 231 ) of the transparent panel ( 230 ) and the shoulder ( 207 ) creates a face gap that does not exceed the predetermined flameproof gap limit.

2. The flameproof housing ( 202 ) of claim 1 , further comprising:

a seal groove ( 209 ) formed in the shoulder ( 207 ); and

a seal ( 210 ) positioned in the seal groove ( 209 ), wherein the seal ( 210 ) prevents moisture from entering the flameproof housing ( 202 ) at the display aperture ( 212 ).

3. The flameproof housing ( 202 ) of claim 2 , with the perimeter interface region ( 264 ) providing a first flamepath span L 1 and with the face interface region ( 260 ) providing a second flamepath span L 2 , wherein the first flamepath span L 1 plus the second flamepath span L 2 provides a flamepath length that equals or exceeds a predetermined minimum flamepath length, wherein the second flamepath span L 2 comprises a shoulder width of the shoulder ( 207 ) minus a seal groove width of the seal groove ( 209 ).

4. The flameproof housing ( 202 ) of claim 2 , with the perimeter interface region ( 264 ) providing a first flamepath span L 1 and with the face interface region ( 260 ) providing a second flamepath span L 2 , wherein the first flamepath span L 1 plus the second flamepath span L 2 provides a flamepath length that equals or exceeds a predetermined minimum flamepath length, wherein the second flamepath span L 2 comprises an outer shoulder portion ( 208 ) that is located outward from the seal groove ( 209 ).

5. The flameproof housing ( 202 ) of claim 1 , with the shoulder ( 207 ) including a predetermined shoulder width that defines the face interface region ( 260 ).

6. The flameproof housing ( 202 ) of claim 1 , with the transparent panel ( 230 ) including a predetermined panel thickness that defines the perimeter interface region ( 264 ).

7. The flameproof housing ( 202 ) of claim 1 , with a flamepath length comprising a predetermined panel thickness plus a predetermined shoulder width.

8. The flameproof housing ( 202 ) of claim 1 , with the perimeter interface region ( 264 ) providing a first flamepath span L 1 and with the face interface region ( 260 ) providing a second flamepath span L 2 , wherein the first flamepath span L 1 plus the second flamepath span L 2 provides a flamepath length that equals or exceeds a predetermined minimum flamepath length.