Weinmann BiLevel ST 22 Operating Instructions Manual page 31

Pressure accuracy
1. Wait for approx. 1 minute, then read the CPAP pressure on the display or the
IPAP and EPAP pressure readings on the bar graph and check whether the values
displayed correspond to the prescribed values.
Respiratory rate/minimum frequency
Note
This check is unnecessary if the device is operated in CPAP mode.
1. Please observe the following procedure: the unit switches periodically between
the two pressure levels IPAP and EPAP.
2. Count the IPAP phases within one minute and compare them with the display.
You can recognize the IPAP phase by the louder operating noise or by the bar
graph in the standard display.
Desired values:
– S mode: 6 phases a minute
– T and ST mode: prescribed value
Permitted deviation:
– maximum ± 1 phase a minute
Triggering
Note
This check is only necessary if the device is operated in the S or ST modes.
1. Turn the unit off by pressing and holding the on/off switch
2. Assemble the nasal mask.
3. Turn the unit on by pressing the on/off switch
4. Put the nasal mask on and breathe normally. In the ST mode your breathing
frequency must be above the prescribed frequency so that the unit's time-
controlled trigger is not active.
The unit must respond to the change in breathing phases with the change in
pressure level.
for 2 seconds.
.
Functional check
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