TSI Instruments PORTACOUNT 8048 - Page 85

Preventive Maintenance, Service, and Troubleshooting 83
Symptom
Possible Causes
Solution
Suspicious
readings
(If the PortaCount
Fit Tester passes
the Daily Checks,
the problem is the
respirator, not the
PortaCount Fit
Tester .)
PortaCount Fit Tester is
flooded with alcohol.
Run two hours to dry the
optics (remove cartridge
and install storage cap).
Tube fittings on
PortaCount Fit Tester are
loose.
Tighten with pliers.
PortaCount Fit Tester
leaks.
Zero-Check the
PortaCount Fit Tester and
fix any leaks.
Sample lines too long.
Use standard five-foot
Twin Tube Assembly.
Alcohol Cartridge is
loose.
Tightly close the Alcohol
Cartridge.
Respirator is not
equipped with HEPA
filters.
Install HEPA filters for fit
tests.
Twin Tube Assembly is
kinked, pinched, or
blocked.
Straighten out the Twin
Tube Assembly or remove
the obstruction.
Leaking respirator probe.
Tighten or seal probe.
Tubing in fit test adapter
is kinked or pinched.
Straighten out tubing.
Respirator is faulty.
Fix or replace the
respirator.
Suspiciously High
Fit Factors
Refer to
Suspiciously High
Fit Factors
section.
Twin Tube Assembly is
kinked, pinched, or
blocked.
Use the real-time fit factor
function to verify the fit
factor.
Straighten out the Twin
Tube Assembly or remove
the obstruction.