12 Dräger PSS BG 4 plus
Use
3.3.3 Inserting an ice pack
Prepare the ice pack as follows:
1. Fill the freezer receptacle with water. Leave approx.
2 inches/50 mm free up to the edge.
2. Allow to freeze completely in a deep freezer at approx.
5 °F/-15 °C for at least 16 hours.
3. Fill the ice receptacle up to the rim with water and leave to
freeze again for another 8 hours in the deep freezer.
Ensure that the ice receptacle is not tilted so that a level
surface is obtained.
4. To remove the ice pack, hold the freezer receptacle briefly
under running water.
Insert the ice pack into the breathing air cooler as follows:
1. Lift the locking device (3) and release the catch (4) in anti-
clockwise direction.
2. Remove the cover from the breathing air cooler.
3. Insert the ice pack into the breathing air cooler.
4. The catch is turned on the cover. Ensure that the catch is
fully open to avoid damage to the positioning aids on the
breathing air cooler when the breathing air cooler is sealed
with the cover.
5. Align the positioning aids on the breathing air cooler (1)
and the cover (2).
6. Press the cover into the breathing air cooler.
7. Turn the catch clockwise to lock the cover. The guide slot
on the catch must hold the lugs on the breathing air cooler.
The catch must engage audibly.
3.3.4 Testing correct functioning of the closed-circuit
breathing apparatus
1. Open the cylinder valve.
The Sentinel switches itself on when the pressure in the
compressed oxygen cylinder is greater than 145 psi/10 bar
and the self-test sequence starts automatically
(see chapter 4.8 on page 29).
2. Close the cylinder valve.
The "remaining period of use" symbol appears on the
display. A single alarm tone sounds. The bar chart runs
once again from left to right.
If the closed-circuit breathing apparatus is OK, the "Open
cylinder valve" symbol is displayed and a dual alarm tone
sounds.
3. Keep the cylinder valve closed.
4. Remove the sealing cap from the connecting piece and
wait until the Sentinel displays a pressure of 0 psi/0 bar.
5. Fit the protective cap back onto the connecting piece.
The Sentinel can display the following results:
NOTICE
Ice in the cooling system may only be used at ambient
temperatures above 32 °F (0 °C).
At temperatures below 32 °F (0 °C), ice must never be
used.
Display on the Sentinel Meaning
The test has been completed
successfully.
An error has occurred.
Do not use the closed-circuit
breathing apparatus. Check
once again that the closed-
circuit breathing apparatus is
functioning correctly or have
the device serviced by
Dräger or trained experts.
Battery warning 1
A long warning tone sounds
at the same time.
With normal use of the
Sentinel, the closed-circuit
breathing apparatus remains
fully functional for up to
4 hours. To ensure safe
usage, the battery should be
replaced, however.
Battery warning 2
At the same time, 5 short
alarm tones sound and the
red LEDs flash.
The Sentinel automatically
powers off and any further
operation is impossible.
The battery must be replaced
before before any new
operation.
Draeger Training 11/16 rev 1
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