42 Chapter
5
User Interface
The touch screen provides the user interface to all functions when the
instrument is operating in stand-alone mode. These functions are accessed
through the tabs at the bottom of the display. The functions available
through each tab are described below.
Activities Tab
The Activities tab lets you perform three functions: Fit Testing,
Daily Checks, and Real-time fit factors.
Fit Test
Press Fit Test [
] to start a fit test in stand-alone mode. Refer to
23H
Chapter 4
for a complete description.
Daily Check
Press Daily Check [
] to start the Daily Checks of the
instrument. Refer to
24H
Chapter 2
for a complete description.
Realtime
Press Realtime [
] to view a graph showing real-time fit factors.
The real-time fit factor display is generally used for respirator
training and troubleshooting. It allows a test subject to experiment
with strap tension and other adjustments while watching the effect
these efforts have in real-time.
The test subject learns how each adjustment affects the fit, and
learns how to achieve a fit that is comfortable and has minimum
leakage.
Note: This feature is intended for training. It should not be used
immediately before a fit test.
Using the feature to help the
test subject don the respirator immediately before the
official fit test defeats one of the main purposes of fit
testing:
to prove that the test subject knows how to don the
mask properly without help
. Use the Real-time Fit Factor
feature for training and practice only.
You can use the real-time fit factor display prior to a fit test
as long as you have the test subject remove the mask and
put it on again (without the use of the real time display or
other assistance) before the final test.
