G1 Pressure Reducer With Primary Low Pressure Warning Device - MSA G1 SCBA Operating Manual

2.5

G1 Pressure Reducer with Primary Low Pressure Warning Device

The pressure reducer reduces the cylinder pressure to an intermediate pressure, which is in turn
further reduced by the regulator to a pressure that is respirable by the user. The pressure reducer
incorporates a fail safe design which ensures air flow to the user in the event of a malfunction within
the pressure reducer.
The pressure reducer incorporates an intermediate pressure relief valve, and a cylinder connector
with a sintered filter to capture particulates that may be in the air stream.
Rapid Intervention Crew/Company Universal Air Connection (RIC UAC)
The pressure reducer is equipped with a Rapid Intervention Crew/Company Universal Air Connection
(RIC UAC) fitting. The RIC UAC fitting is for use by rapid intervention teams for emergency filling oper-
ations. The SCBA includes an automatically resetting pressure relief valve to vent excess pressure if
the SCBA is over pressurized during an emergency filling operation.
Primary Low Pressure Warning Device (Bell)
The primary low pressure warning device alarms when there is approximately 35 % of the SCBA's
rated service time remaining and when the cylinder valve is first opened, providing an audible indica-
tion that the alarm is working properly. NIOSH regulation states that the primary low pressure warning
device must alert the user at 35% ± 2%. MSA sets all low pressure warning signals to the mean of
the requirement, hence 35 %.
Remaining Service Time
Cylinder
30 min. 2216 psi
30 min. 4500 psi
30 min. 5500 psi
45 min. 4500 psi
45 min. 5500 psi
60 min. 5500 psi
60 min. 4500 psi
NOTE: The remaining service time calculations are based on a 40 LPM (liters per minute) NIOSH
breathing rate.
(Approx.)
10 minutes
10 minutes
10 minutes
16 minutes
16 minutes
21 minutes
21 minutes
G1 SCBA
End of Service Time Indicator Pressure
(Approx.)
775 psi
1575 psi
1925 psi
1575 psi
1925 psi
1925 psi
1575 psi
Description
US
15