JFD Divex SLS Mk IV, Operation And Maintenance Manual

Page: 36 / 136

24 OM131
Chapter 2 P1939-OM-131 R11
The internal pressure within the SLS System will vary between the single stage regulator set
pressure of 138 mbar (2 psi) and the overpressure valve set pressure of 172 mbar (2.5 psi) as the
diver’s ambient pressure changes during upward or downward excursions.
2.3.8 Overpressure indicator
The overpressure indicator provides a visual indication that positive pressure is maintained in the
SLS System whilst it is in stand-by mode. The indicator consists of a red to green colour change
'Rotowink' pressure indicator installed in a robust metal housing. This housing is allowed to flood in
order to reference the ambient water pressure. A fine mesh screen, fitted to prevent the ingress of
dirt protects the sensitive internal parts.
N
OTE
There are two versions of overpressure indicator in service, denoted Type 1 and Type 2.
2.4 H
ARNESS AND COUNTERLUNGS
2.4.1 Harness
The backpack housing assembly is attached to the diver’s back by a fully adjustable harness, which
is shown in Fig 2.9.
Fig 2.9 Harness and counterlungs
(Part No: C2604)