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<br />Regulator. <br /> <br />The HUn shall serve as the secondary EOS indicator. It shall be mounted in the users field of <br />vision on the second stage regulator. It shall display one-quarter bottle increments including full <br />bottle pressure and continuing to 25% of maximum bottle pressure. The display shall not have a <br />numerical representation of bottle pressure. At one-half bottle pressure, one "yellow" LED shall <br />be illuminated and flash at a rate not to exceed ten (lOx) times per second. The HUD shall have a <br />low battery indication that is distinct and distinguishable from the bottle pressure indications. <br /> <br />The HUD shall be intrinsically safe per ANSI/UL 913, Class I, Division 1, Group A, B, C & D <br />Hazardous Locations and certified to CAN/CSA Std C22.2 No. 57-92 when operated on one 9v <br />alkaline battery. Battery life shall be for a minimum of 300 hours. <br /> <br />Harness and Backframe Assembly <br />A lightweight, lumbar support style backframe and harness assembly shall be used to carry the <br />cylinder and valve assembly and the pressure reducing regulator assembly. The backframe shall <br />be a solid, one-piece powder-coated black aluminum frame that is contoured to follow the shape <br />of the user's back. The backframe shall include a mounting for the pressure reducer. This <br />mounting shall contain a pivot-type bracket permitting positioning of the pressure reducer to <br />accommodate connection to any of the approved cylinders. <br /> <br />The backframe shall include an over-the-center, adjustable tri-slide fixture, a para-aramid fiber <br />strap and a locking latch assembly to secure 30,45 or 60 minute cylinders. The harness assembly <br />shall consist of a one size black para-aramid strap with a yellow stripe. This harness shall include <br />box-stitched construction with no screws or bolts. The harness assembly shall incorporate <br />parachute-type, quick-release buckles and shall include individual replaceable shoulder and hip <br />pads. The harness shall include a seat-belt type waist attachment. The backframe shall include <br />accommodation and mounting spaces suitable for an electronics package that could include, but <br />not be limited to, an optional distress alarm, an optional transmitting distress alarm, SCBA status <br />indication lights and SCBA sounders. <br /> <br />Optional chest strap shall be provided. <br /> <br />Electronics Package <br />The electronics package shall be standard with the following equipment: (1) dual sounders located <br />on each side of the cylinder; (2) dual SCBA indicator lights located on each side of the cylinder; <br />and (3) a quick change battery compartment, suitable for housing 3 "C" cell size batteries. The <br />batteries shall be capable of 6-months of use at a 25% duty cycle. <br /> <br />The sounders and lights shall be activated during each of the following events: (1) cylinder <br />engagement; (2) cylinder disengagement; (3) normal use; (4) half and quarter cylinder content <br />indication; and (5) distress alarm if installed. <br /> <br />During cylinder engagement, the sounders shall emit an ascending tone and the SCBA indicator <br />lights shall flash "blue". During cylinder disengagement, the sounders shall emit a descending <br />