DIRECTIONAL DIFFERENTIAL PRESSURE DETECTOR

A device for indicating a presence of a directional differential pressure between a first space and a second space separated from the first space by a barrier, the device permitting fluidic pressure connection between the second space and a pivot arm in the first space, the device comprising: a first conduit arranged to extend through at least a portion of the barrier separating the first space and the second space; a rotating base which is rotatable relative to the first conduit; the pivot arm is arranged to form a fluidic pressure connection with the first conduit, the pivot arm rotatably attached to the rotating base to permit adjustment of an inclination of the pivot arm relative to a horizontal plane among a plurality of inclination angles in which a first, vertically lower region of the pivot arm is vertically lower than a second, vertically higher region of the pivot arm; and at least one movable element disposed within the pivot arm and movable from the first, vertically lower region of the pivot arm to the second, vertically higher region of the pivot arm in response to a differential pressure between the first and second spaces.