Maintenance
Dräger PSS BG 4 plus 25
4.5 Testing of the closed-circuit breathing
apparatus using the RZ7000
Perform the leak-tightness and functional test before initial
commissioning and after every maintenance operation.
If the CO
2
absorber is installed in the closed-circuit breathing
apparatus, the functional test can be performed a total of six
times whereby testing should not take longer than 15 minutes.
After these 6 tests, the CO
2
absorber must be replaced and is
no longer permitted to be used.
A record of each test should be made on the CO
2
absorber
housing, with details of month and year and the tester’s initials.
If the breathing circuit is opened for more than 5 minutes, the
CO
2
absorber apertures should be sealed to be gas-tight.
1Display
2 Selector switch
3Pump
4 Switch for venting
5 Connection for closed-circuit breathing apparatus
6 Connecting piece
7 Protective cap
WARNING
If a fault is detected during the leak-tightness and
functional test, the closed-circuit breathing apparatus
must not be used. Send the device in to Dräger or have
it serviced by trained personnel.
Failure to follow this warning could lead to death or
serious injury.
NOTICE
The tests are described using the Dräger RZ 7000 test
unit. The specified sequence of the tests is the optimal
sequence with this test unit. An overview is given on
page 35.
The closed-circuit breathing apparatus can also be
tested with other test units (e. g. Dräger Test-it 6100,
Dräger Quaestor 5000) in other sequences.
The tests should not be performed with direct sunlight
or in a cold room as the air pressure in the device will
then change quickly and can result in incorrect test
results.
i
i
34921851.eps
L/min
65 34
7 12
Draeger Training 11/16 rev 1
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