Performing The Test; Examining Tightness Of The Suit Valves; Special Maintenance Work - Dräger CPS 7900 Gebrauchsanweisung

6.5.1 Preparation of test
1. Seal the connections for protective suits with ventilation
unit.
2. Close the fastener system.
3. Spread out the chemical protective suit front-down on a
clean and even surface.
4. Protect the visor with a soft underlay in order to avoid
scratches.
5. Unfasten the protective cap from both suit valves and
remove the valve discs.
6. Fit one test cap on one suit valve and connect it to the test
unit via the blue test hose.
7. Fit another test cap on the other suit valve.
8. Ensure that both valves are connected to the black hose of
the test unit.
9. Connect the test cap to the compressed air supply (6 bar)
via the black hose.
10. Carry out the test (see Chap. 6.5.2 on Page 29).
6.5.2

Performing the test

CAUTION
!
If the suit is overfilled, the material will be damaged.
When filling the chemical protective suit ensure that
the pressure does not exceed the specified values.
1. Open the blow up valve on the black hose and fill the
chemical protective suit until the test unit shows 17.5 mbar
(179 mm WC). Close the blow up valve.
2. Set a settling time of 10 minutes start the stopwatch.
During this time, keep the pressure at approx. 17 mbar
(173 mm WC) so that a pressure and temperature
compensation can be carried out. If required, top up the air.
3. Open the relief valve. Lower the pressure to 16.5 mbar
(168 mm WC). Close the relief valve.
4. Set a test time of 6 minutes and start the stopwatch.
5. Read off the pressure on the test unit at the end of the test
time.
If the pressure drop is less than or equal to 3 mbar
(30 mm WC), the chemical protective suit is deemed sealed.
Then disassemble the test setup and check the suit valves.
If the pressure drop is greater than 3 mbar (30 mm WC):
1. Moisten critical points (such as seams, closure system,
glove and boot joints) with soapy water.
2. Mark leaking areas.
3. Rinse off soapy water and dry the chemical protective suit
thoroughly.
4. De-aerate and repair the chemical protective suit.
5. Repeat the leak test.
Alternatively, the chemical protective suit can be returned to
Dräger for repair.
6.6

Examining tightness of the suit valves

The test is described for the test device Porta Control 3000.
You can carry out the tests with other test devices, but the
indicated values must be observed.
Carry out the test according to EN 943-1, 6.5.1, however with
10 mbar overpressure, at constant room temperature
(20 °C ±5 °C).
The compressed air used must comply with the requirements
of EN 12021.
The required test accessories are listed in the order list (see
Chapter 11 on Page 37).
Dräger CPS 7900
1. Remove the blow up valve with plug-in coupling from the
hose.
2. Connect the hose end to the test unit.
3. Insert the pumping ball on the relief valve into the black
hose in a way that the arrow on the pumping ball points
toward the relief valve.
4. Moisten valve disc with clear water and fasten.
5. Fit the test cap from the outside on the valve to be tested
and connect it to the test unit via the black hose.
6. Open the relief valve and create an overpressure of
+10 mbar (102 mm WC) with the pumping ball. Close the
relief valve.
7. Set a test time of 1 minute and start the stopwatch.
8. Read off the pressure on the test unit at the end of the test
time.
If the pressure change is less than 1 mbar (10 mm WC), the
suit valve is OK. In this case:
1. Check the next suit valve.
2. Disassemble test setup.
3. Fit the protective cap onto the suit valve.
If the pressure change is greater than 1 mbar (10 mm WC):
1. Remove the valve disc and conduct a visual inspection.
The valve disc and valve seat must be clean and
undamaged.
2. If necessary, replace the valve disc (see Chap. 6.7.3 on
Page 30).
3. Repeat the test.
6.7

Special maintenance work

Check for leaks again after servicing and/or replacing parts.
We recommend that all repairs be conducted by Dräger.
6.7.1 Replacing gloves
WARNING
!
If the chemical protective suit is equipped with a glove
combination, the glove combinations must be
removed, disposed of and replaced with a new glove
combination. No assurance has been made that the
material will be able to withstand repeated chemical
exposure.
Do not use talcum for fitting the gloves. Otherwise the
gloves may slip out if the user exerts too much
pressure on the glove from inside by stretching too
much.
Always replace gloves or glove combinations as follows:
1. Remove overglove and rubber ring (if fitted).
2. Lift the arm ring with the thumb and press the support ring,
on which the glove is located, out of the sleeve.
3. All gloves except glove combinations:
Pull the new glove onto the support ring and align at the
arm ring. The long axis of the elliptical support ring points
parallel to the hand surface.
Make sure that no wrinkles develop between glove and
support ring.
4. Insert a glove with support ring or new glove combination
through the open closure system into the chemical
protection suit sleeve.
Maintenance
29