During Use; Testing Positive Pressure Full Face Mask; Testing Normal Demand Full Face Mask - Dräger 2500 Instructions For Use Manual

en Use
4.4

During use

INFO
The required test accessories are listed in the order list (see
chapter 10 on page 28).
4.4.1

Testing positive pressure full face mask

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. Moisten the sealing surface and exhalation valve with
water, if necessary.
3. Mount the full face mask on the test head.
4. Seal plug-in coupling
Checking the opening pressure of the exhalation valve
1. Press the right control lever until the exhalation valve opens.
2. Read the opening pressure and compare with the target
value:
The exhalation valve must open between +4.2 mbar and
5.7 mbar.
Test for leaks
1. Press left control lever to generate a negative pressure of
approx. -15 mbar.
2. Pull left control lever to generate a negative pressure of
approx. -10 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.
20
4.4.2

Testing normal demand full face mask

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. Moisten the sealing surface and exhalation valve with water,
if necessary.
3. Mount the full face mask on the test head.
4. Seal plug-in coupling
Checking the opening pressure of the exhalation valve
1. Press the right control lever until the exhalation valve opens.
2. Read the opening pressure and compare with the target
value:
The exhalation valve must open between 0 mbar and 3 mbar.
Test for leaks
1. Press left control lever to generate a negative pressure of
approx. -15 mbar.
2. Pull left control lever to generate a negative pressure of
approx. -10 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.