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The compressed air line supply unit model RL 4603 BUSS is a feeding system, complete and very safe, to feed at distance and even in very dangerous situations up to two operators. The unit is the main component of a breathing respirator with demand valve and full face mask. RL BUSS respirators are intrinsically provided with a back up supply system (BUSS) that provides air to the operator in case of interruption of the feeding from the main line, they are therefore suitable and ideal for the protection of the operators involved in long duration works in chemical plants, polluted areas and, generally, in all the cases where the worker shall enter narrow dangerous places and a safety margin is needed in case of problems with the main air line feeding system.
RL BUSS
systems include a feeding system,made of a reducer and a filtration unit for breathable air coming from the line, andamobile supply unit type RC 4603 that acts as. The two units are both mounted on the RC trolley and are connected by means of a 4 way valve that automatically switches from the air line feeding to the cylinder feeding in case of interruption of the main air line.
The system RL 4603 BUSS is made of a feeding system consisting of an adjustable pressure reducer and of a breathable air filtration unit for two operators provided with a coalescent filter for particle filtration and a carbon filter for gas and vapours filtration. The feeding system is connected to two four way valve (also included in the system) that can feed through 8x17 hoses up to two demand valves and full face masks that may be up to a distance of 50 metres. The complete system also includes a RC 4603 which acts as "Back Up Supply Unit" (BUSS) which is connected to the second inlet of the four way valves and which activates in case of accidental failure of the main line.
Refer to the specific data sheet of the RC 4603 for a description of the Back Up Supply System and of the relevant accessory needed for the use of the device (mask, demand valve, hoses and waist belt).
The system is provided with the exclusive MK2 alarm system positioned in the demand valve only if the line has been settled up with a Spasciani RB reducer or when the RC system is active.
The RL BUSS shall be fed by a compressed air line source able to provide air of breathable quality (according to EN 12021) at a maximum pressure of 12 bar, thet shall be then settled to 5 – 6 bar by means of the reducer regulator, and with a minimum flow of 500 lt/min for operator.
RL BUSS
respirators may be used in conjunction with back up self contained breathing apparatus BVF BU, connected through a four way valve and worn by the user. The breathing apparatus activates when for every reason the feeding from the air line system is interrupted and enable to get out from the dangerous area. | 
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