Troubleshooting
43
Traceline way above challenge pressure line
The QuantiFit2 traceline goes opposite of the direction of the pressure. If the line is above the
challenge pressure line, that means that there is too much negative pressure. In this case, a test
subject is most likely continuing to draw a breath in during the test. Movement by the person
being tested needs to be minimized. Actions such as swallowing or opening the mouth, can
adversely affect the pressure sensor and will be indicated by an erratic traceline.
1.
Air inhalation or exhalation, even slightly, creates dramatic changes within the respirator. Instruct
the test subject to maintain breath holding during the test measurement.
2.
A test subject may be unable to stop the flow of air through the nose while holding his or her
breath. A nose clip can assist the subject (be sure that the nose clip does not interfere with the fit
of the respirator).
3.
Improper breath hold. Instruct the user to relax, take a comfortable breath and hold as if going
under water.
The pressure inside the respirator drops during the test
This graph would indicate that the challenge pressure was achieved, but during the test, a leak
source opened. This could be the result of an exhalation valve that is in poor condition, or from
the test subject moving his or her head, or subject stopped holding their breath and creating a
leak in the seal.
1.
Clean the exhalation valve in the respirator
2.
Instruct subject to take a normal breath in, and hold as if going under water
3.
Examine the condition of the respirator
Summary of Contents for QuantiFit 2
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