Testing Positive Pressure Lung Demand Valve; Testing Normal Demand Lung Demand Valve - Dräger Testor 2500 Notice D'utilisation

4.4.3

Testing positive pressure lung demand valve

INFO
Self-contained (open-circuit) breathing apparatus in which the
lung demand valve is permanently connected to the pressure
reducer cannot be tested as described below. Contact the
manufacturer for information.
Visual inspection
Inspect all components. Check in particular for possible

damage (e.g. deformation, adhesion, contamination or
cracks). Replace faulty or damaged parts immediately.
Preparation of test
1. Connect test unit to medium pressure.
2. Seal the hose of the lung demand valve.
3. Shut off lung demand valve.
4. Connect the lung demand valve to the "mouth" of the test
head with the mouth adapter.
Testing the seal of the lung demand valve (positive-
pressure test)
1. Generate a positive pressure of approx. +12 mbar.
2. Pull left control lever to generate a positive pressure of
approx. +7.5 mbar.
3. Start test time of 1 minute on the timer.
4. Read off the pressure at the end of the test time.
The pressure difference must not exceed ±1 mbar.
Testing low-pressure rise
1. Disconnect lung demand valve from the "mouth" of the
test unit.
2. Open the hose of the lung demand valve and connect it to
the medium-pressure connection of the test unit.
3. Shut off lung demand valve.
4. Connect the lung demand valve to the "mouth" of the test
head with the mouth adapter.
5. Pull right control lever to generate a pressure of 0 mbar.
6. Start test time of 1 minute on the timer.
7. Read off the pressure at the end of the test time.
The pressure must not rise above 8 mbar.
Testing switching pressure and static positive pressure
1. Press the left control lever until the lung demand valve
switches on.
2. Read the low pressure gauge to check the negative
pressure at which the lung demand valve switches on.
The lung demand valve must open between -3.0 mbar
and -30 mbar.
3. After a few seconds read the next value (= static positive
pressure) at the low pressure gauge.
The pressure must be between +1 mbar and +3.9 mbar.
4.4.4

Testing normal demand lung demand valve

INFO
Self-contained (open-circuit) breathing apparatus in which the
lung demand valve is permanently connected to the pressure
reducer cannot be tested as described below. Contact the
manufacturer for information.
Visual inspection
Inspect all components. Check in particular for possible

damage (e.g. deformation, adhesion, contamination or
cracks). Replace faulty or damaged parts immediately.
Preparation of test
1. Connect test unit to medium pressure.
2. Seal the hose of the lung demand valve.
3. Connect the lung demand valve to the "mouth" of the test
head with the mouth adapter.
Testing the seal of the lung demand valve (positive-
pressure test)
1. Generate a positive pressure of approx. +12 mbar.
2. Pull left control lever to generate a positive pressure of
approx. +7.5 mbar.
3. Start test time of 1 minute on the timer.
4. Read off the pressure at the end of the test time.
The pressure difference must not exceed ±1 mbar.
Testing low-pressure rise
1. Disconnect lung demand valve from the "mouth" of the
test unit.
2. Open the hose of the lung demand valve and connect it to
the medium-pressure connection of the test unit.
3. Connect the lung demand valve to the "mouth" of the test
head with the mouth adapter.
4. Pull right control lever to generate a pressure of 0 mbar.
5. Start test time of 1 minute on the timer.
6. Read off the pressure at the end of the test time.
The pressure must not rise above 8 mbar.
Testing opening pressure
1. Press left control lever and read the pressure at the low
pressure gauge.
The balanced piston unit must open between -0.5 mbar
and -3.5 mbar.
en
Use
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