2006-017-RES-PLANO - Laserfiche WebLink

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Facepiece-Mounted Positive Pressure Regulator The facepiece-mounted positive pressure-breathing regulator shall supply and maintain air to the facepiece to satisfy the needs of the user at a pressure greater than atmospheric by no more than 1.5 inches of water pressure. The breathing regulator shall maintain this positive pressure during flows NFP A standard breathing rates. The regulator shall also meet or exceed a dynamic flow requirement of remaining positive while supply a minute volume of 160 liters. The regulator shall use a spring designed to lower the breathing exhalation resistance. The exhalation resistance, at 100 lpm, shall be between 1.7" and 2.3" of H2O column. The breathing regulator shall have attached a low pressure hose which shall be threaded through the left shoulder strap to couple to the pressure reducing regulator mounted on the backframe. The regulator shall have a quick connect coupling in line for use with the optional outlet manifold and accessory hose to allow the breathing regulator to be disconnected from the unit and reconnected to the auxiliary hose of a second unit in the event rescue is required. The quick connect coupling shall be easily connected and disconnected by trained individuals with a gloved hand and in low light conditions. The coupling shall also be guarded against inadvertent disconnect during use of the equipment. The low-pressure hose shall be equipped with swivel attachments at both ends. The breathing regulator outlet port shall be configured as the male half of a quarter (1/4) turn coupling which mates with the facepiece and shall be equipped with a doughnut-shaped gasket which provides the seal against the mating surface of the facepiece. The regulator cover shall be fabricated of a flame resistant, high impact plastic. The breathing regulator shall also have an integral low-pressure alarm device that shall combine an audible alarm with simultaneous vibration of the facepiece. This alarm device shall indicate either low cylinder pressure or primary first stage regulator failure. The breathing regulator shall have a demand valve to deliver air to the user, activated by a diaphragm responsive to respiration. The demand valve shall use an extended temperature range dynamic O-ring seal composed of a fluorosilicone elastomer. This diaphragm shall include the system exhalation valve and shall be constructed from a high strength silicone elastomer. A purge valve shall be situated at the inlet of the breathing regulator and shall be capable of delivering airflow of between 125 and 175 standard liters per minute. The breathing regulator shall be arranged to direct the incoming air over the inner surface of the facepiece for defogging purposes. The components of the breathing regulator shall be constructed of materials that are not vulnerable to corrosion. The flame resistant cover shall contain an air saver switch and pressure demand bias mechanism. It shall reactivate and supply air only in the positive pressure mode when the wearer effects a face seal and inhales. This device shall not affect the breathing flow though the system while in operation. End of Service Indicator ~ and Heads-up Display (HUD) The SCBA shall have two end-of-service (EOS) indicators. The primary EOS shall be the integral low-pressure alarm device that shall combine an audible alarm with simultaneous vibration of the facepiece. The primary EOS shall be located in the Facepiece-Mounted Positive Pressure