23
Operation – Sniff Nasal Inspiratory Pressure
Before commencing a test the correct size of nasal probe to be used
must be ascertained. The unit is supplied with four sizes designed to
cover a wide range of nostrils. Select the size that appears to be the
most appropriate, connect it to the unit as shown below, and ask the
subject to insert the probe firmly into a nostril. Once fitted the subject
should close the other nostril with a finger and try to inhale through
the probe to check the sealing. When the correct size has been
selected proceed as follows: Insert the battery into the battery
compartment at the rear of the unit, fit the selected probe as shown
below:
Nasal probe
2
Microcomputer unit
Nasal plug
adapter
To measure the maximum sniff inspiratory pressure, slide the switch
from the “off” position to the SNIP position. Rotating segments will be
displayed whilst the unit performs an auto-zero function.
During this time there should be no applied pressure.
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