Invacare LiNX Service Manual page 89

• Minimum limit for soft puff,
• minimum limit for hard puff,
• minimum limit for soft sip and
• minimum limit for hard sip.
To calibrate the Sip and Puff module, you have to record
pressure measurements from a series of pressure samples
performed by the user and adjust the four pressure
thresholds accordingly.
1.
Open Connection in menu bar.
2. Select Sip and Puff Calibration.
3.
A Hard zone for puff input
B Threshold slider to adjust minimum limit for hard
puff
C Soft zone for puff input
D Threshold slider to adjust minimum limit for soft
puff
E Neutral zone for puff input
F Neutral zone for sip input
G Threshold slider to adjust minimum limit for soft
sip
H Soft zone for sip input
I Threshold slider to adjust minimum limit for hard
sip
J Hard zone for sip input
1605129-C
Modifying wheelchair configuration with PC tool
4. User performs hard puff, soft puff, hard sip and soft sip
in no specific order. For each sip and puff, a pressure
level K is recorded on calibration tool. Based on these
recorded levels, you determine best level at which to
set each pressure threshold.
5. Drag corresponding Threshold sliders.
• For soft puff, drag threshold slider D to position
just below user's soft puff. Any subsequent pressure
below threshold slider D is in neutral zone E and
is ignored. Pressure above threshold slider D and
below threshold slider B is in soft zone C and
determined a soft puff.
• For hard puff, drag threshold slider B to position
just below user's hard puff. Pressure below
threshold slider B is not considered as hard puff.
Pressure above threshold slider B is in hard zone
A and determined as hard puff.
• For soft sip, drag threshold slider G to position just
above user's soft sip. Any subsequent pressure
above threshold slider G is in neutral zone F and
is ignored. Pressure below threshold slider G and
threshold slider I is in soft zone H and determined
as soft sip.
• For hard sip, drag threshold slider I to position just
above user's hard sip. Pressure above threshold
slider I is not considered as hard sip. Pressure
below threshold slider I is in hard zone J and
determined as hard sip.
Sip and Puff Ramp Time
The Sip and Puff Ramp Time defines the amount of time
that a pressure input must remain in the soft zone before
it is registered as a soft sip or puff. Consequently, it also
provides:
• Time for a user to cross from the neutral zone to the
hard zone and
• a filter for any noise (unintentionally pressures) at the
zone boundaries.
The ramp time C begins at the point where the pressure
input D, E or F crosses into soft zone H — either from
neutral zone I, when pressure is increasing, or from hard
zone G, when pressure decreases. A pressure input D
that reaches the hard zone before ramp time expires, is
registered as a hard sip or puff. A pressure input E within
soft zone at the end of ramp time is registered as a soft sip
or puff. Pressure inputs F that fall away into neutral zone
before ramp time expires are not registered as an input.
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