Airtec Expert CYPRES 2, User Manual

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page 6 - CYPRES 2 User’s Guide -
1.3 How CYPRES 2 works
Each time CYPRES 2 is switched on it repeatedly
measures the ambient air pressure over a short period
of time and takes the average value as the value for
ground level, thereby “zeroing” itself. This is per-
formed during the integrated self-test.
While in use, CYPRES 2 continuously checks the
air pressure while on the ground and adjusts to any
fluctuations in air pressure due to changing weather
conditions. While you might need to reset your al-
timeter before a jump, CYPRES 2 takes care of itself.
This precise calibration should allow CYPRES 2 to
recognize the exact activation altitude and speed.
The processing unit contains a factory-programmed
microprocessor that can calculate the jumper’s
altitude and rate of descent in real time based on
barometric pressure. By continuously monitoring
this data, CYPRES 2 can make calculations regard-
ing the jumper’s altitude and rate of descent. Should
CYPRES 2 decide that the jumper is in a dangerous
situation (i.e., still in freefall at low altitude), the
processing unit instructs the release unit to initiate
the reserve container opening sequence.
The release unit (cutter) for the reserve container is
completely independent of the primary reserve para-
chute activation system (the reserve ripcord). Rather
than withdrawing the ripcord pin from the reserve
closing loop, the release unit cuts the reserve closing
loop inside the reserve container in order to initiate
the opening sequence. Please note that the closing
loop must pass through the cutter hole.
Initiating a reserve container’s opening sequence by
cutting the reserve closing loop is a method that was
invented and patented by Airtec’s founder Helmut
Cloth in 1987.
The CYPRES 2 activation system offers numerous
advantages:
• The reserve container opening sequence can be
initiated either by the jumper pulling the reserve
handle or by CYPRES 2 cutting the reserve clos-
ing loop.
• The only mechanical component is a single mov -
able piston in the release unit.
• The activation system is located inside the reserve
container where it is not exposed to excessive
shocks or other adverse influences.