This product is now obsolete. The nearest replacements are the Drager PAS AirPack 2 and the Scott Safety Airline Breathing Apparatus.
The MSA MASS trolley systems are an insulating and non-autonomous Personal Protective Equipment
(as it depends on a hose supplying breathable air to the user) for respiratory protection, indipendent from
the environmental atmosphere. Air for breath is supplied to the operator by cylinders of compressed air
(whose capacity changes according to the model of chosen cylinders, so that many autonomies are
admitted) through a pressure reducer, a supply line at medium pressure, a lung governed demand valve and finally a full-face mask complying with EN 136, class 3.
The exhaled air is expelled through the mask exhalation valve directly into the environmental atmosphere.
The hose for supply of breathable compressed air complies with basic requirements, as provided by EN
14593-1:2005 and it also meets antistatic requirements (S-marking) and heat resistance (H-marking). Hoses
for compressed air are equipment used for breath in environments where there is gas or air, whose
respirability is not guaranteed and are not suitable for the underwater use.
MASS trolley systems of MSA can be used in all places where the air in the environment following to the
presence of harmful substances for human is no more considered to be breathable, as it canít be purified
with absolute certainty or because the filtering equipment canít be any longer used because of lack of
The mobile systems for breathable air supply can be also used, when another equipment for the respiratory
protection, like for example an self contained breathing apparatus or a filtering equipment canít be used
because of a limited autonomy or unfavourable conditions of place of work that do not allow wearing a
similar equipment or whose weight would worsen the usual conditions of use, by reducing its efficiency.
In combination with suitable MSA Auer self contained breathing apparatus BD 96 Mini, BD Mini or BD 96
(in standard versions S, Z and S-Z), having the function of further air supply and by the use of a 3-way
valve (ASV), the mobile Air-Line systems of MSA - MASS series - become an autonomous respirator.
The mobile respirators of MASS series can be easily used also for maintenance and repair operations in
tanks, containers, underground passages and so on (confined spaces).
The main uses for which it is recommended the use of these mobile PPE are the following:
Works inside tanks
Cleaning of basins containing sewage sludge
Works inside sewers
Protection of plants in case of an emergency, for example by allowing remaining inside a panel room in
a heating plant for the setting at safety of plants with the possibility of using the self contained
breathing apparatus to let in uncontaminated air again.
Firemen for rescue interventions in contaminated environments, for example in tunnel, ships, wells, to
the aid of people unable to move, by using them, if necessary, as air supply with anti-contamination
overalls provided with a air supply hose.