Scuba Force SF2 ECCR - Positive- and Negative Test

Manual Version 19 / 01-2019 II Page 36 of 44
SF2 ECCR OPERATION MANUAL
8.2 Positive and negative pressure test
Positive test
With the help of the
overpressure test, the entire
system is checked for leaks and
the function of the overpressure
or outlet valve (OPV) of the
counterlung is also tested. To do
this, tilt the assembled device or
lay it down so that the OPV of
the counterlung is free. Turn off
the OPV and perform the
positive pressure test. Put the
loop in your mouth, inhale
through your nose and exhale
through your mouth until the
OPV blows off. Close the loop
and wait for 1-2 minutes. Now check whether the counterlung is still bulging
outwards. Now open the mouthpiece and pay attention to whether the residual
pressure has been maintained.
Negative test
With the help of the vacuum
test, the entire system is
checked again for leaks. The
negative pressure test is more
sensitive and therefore even
more important than the positive
pressure test. Put the loop in
your mouth, inhale through your
mouth and exhale through your
nose. Suck the air out of the
circuit until a
Negative pressure is created.
Close the loop and wait for a few
minutes. Now open the
mouthpiece and make sure that
the negative pressure has been
maintained (sound of gas
flowing in).