Performing The High Pressure Leak Test (Optional); Checking The Constant Metering Valve And Bypass Valve; 4.5.10 Checking The Minimum Valve; 4.5.11 Checking The Residual Pressure Warning - Dräger PSS BG 4 RP Instructions For Use Manual

en Maintenance
4.5.8

Performing the high pressure leak test (optional)

1. Set the selector switch on the test unit to
2. Open cylinder valve.
3. Note the cylinder pressure displayed on the Bodyguard.
If the cylinder pressure is less than 165 bar, the high pressure
leak test cannot be performed. In this case, the compressed
oxygen cylinder must be filled.
If the cylinder pressure is greater than 165 bar, the "Close
cylinder valve" symbol appears on the Bodyguard display.
The alarm tone sounds twice.
4. Close cylinder valve.
On the Bodyguard display, the bar chart runs from left
to right.
The "Remaining usage period" symbol appears on the
Bodyguard display. A single alarm tone sounds. The bar chart
runs once again from left to right.
The result of the test is output after approx. 15 seconds.
The following results may occur:
Result
An error has occurred.
The "X" symbol appears on
the Bodyguard display.
The alarm sounds four times.
Do not use the closed-circuit
breathing apparatus.
The closed-circuit breathing
apparatus is OK.
The "Open cylinder valve"
symbol appears on the Body-
guard display. The alarm
tone sounds twice.
4.5.9 Checking the constant metering valve and bypass
valve
1. Set the selector switch on the test unit to
protective cap fits over the pressure relief valve tappet.
2. Set the selector switch on the test unit to
3. Pull the open side of the protective cap over the pressure
relief valve tappet and hold. Pump until the protective cap is
secured by the filled breathing bag.
4. Open cylinder valve.
5. Briefly press the red button for the bypass valve.
Oxygen must be heard to flow into the circuit (flow noise).
6. Pump until +10 mbar is reached.
7. Set the selector switch on the test unit to l/min.
After a short settling time, the flow must be between 1.5 and
1)
1.9 l/min .

4.5.10 Checking the minimum valve

1. Set the selector switch on the test unit to
remove the protective cap.
2. Wait until flow noises can be heard on the minimum valve.
The opening pressure must be between +0.1 mbar and
+4.5 mbar.
1) Only applies at a cylinder pressure of 180 to 200 bar.
66
.
next steps
Check once again that the

closed-circuit breathing
apparatus is functioning
correctly or have the de-
vice serviced by Dräger or
trained experts.
Open cylinder valve.

until the
.

4.5.11 Checking the residual pressure warning

1. Set the selector switch on the test unit to
2. Close cylinder valve.
3. Observe the Bodyguard.
The first residual pressure warning should be issued at
approx. 55 bar.
The alarm sounds intermittently. The red LEDs flash.
4. Remove the connecting piece from the test unit connector.
The device is vented automatically.
5. Fit the protective cap onto the connecting piece.
NOTICE
i i
The second remaining pressure warning cannot be
tested with this test.
To determine the exact trigger values, a pressure
gauge comparative measurement must be carried out.
This is described in the apparatus maintenance
manual.
4.5.12 Switching off the Bodyguard and checking the
battery charge status
1. Simultaneously hold the right and left hand buttons on the
Bodyguard pressed down until a short beep sounds.
2. Release the buttons.
The charge status of the battery is displayed for 3 seconds.
The Bodyguard then switches off.
The charge status is displayed as follows:
Display on the Bodyguard
bar
bar
bar
and
Meaning
Battery OK:
The battery charge is ade-
quate, the battery need not
be replaced.
33621851.eps
Battery warning 1:
A long warning tone sounds
at the same time.
With normal use of the Body-
guard, the closed-circuit
breathing apparatus remains
fully functional for up to
4 hours. To ensure safe us-
20221851.eps
age, however, the battery
should be replaced when this
warning is issued during the
self-test before use.
Battery warning 2:
At the same time, 5 short
alarm tones sound and the
red LEDs flash.
The Bodyguard automatically
powers off and any further
operation is impossible.
The battery must be replaced
20321851.eps
before before any new opera-
tion.
.