Structure And Function Of Components; Basic Apparatus; Dsl Connector; Dsl Asv - MSA DSL Serie Manual De Instrucciones

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Structure and Function of Components

3.1.

Basic Apparatus

3.1.1 DSL Connector

The basic DSL apparatus consists of the waist belt and the connector. The purpose of the waist belt with the
connector is to relieve strain on the lung governed demand valve and full face mask. Breathable air is delivered to
the connector through the compressed air supply hose and safety coupling.
The plug-in length (short) of the locking mechanism in the safety coupling at the connector differs from the plug-in
length (long) of the compressed air supply hose, so that the supply cannot be connected directly to the hose of
the lung governed demand valve and bypass the strain relief function of the waist belt.
Fig. 1 Connector with waist belt
1 Short coupling
2 Long plug nipple

3.1.2 DSL ASV

The basic apparatus with automatic switch valve (DSL ASV) consists of the waist belt and the ASV. The ASV is
used as the connector and for the emergency air supply when connected to the related self-contained breathing
apparatus. The emergency air supply ensures that breathable air is supplied to the wearer in the event of a partial
or total loss of air pressure in the compressed air supply hose. In this case, the ASV switches automatically to the
related self-contained breathing apparatus. While the emergency air supply is active, the wearer receives an
audible warning signal from the ASV.
Fig. 2 ASV
1 External supply line
2 Warning signal
3 Self-contained compressed air breathing
apparatus (short plug nipple)
1
2
4
5
4 Lung governed demand valve (coupling)
5 Tool connector (not included in the certifications)
DSL Series
Structure and Function of Components
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