Revision A
21
4.5 CLEANING THE TDA-2SP SCANNING PROBE SCREENS
The TDA-2SP Scanning Probe is a rugged, low maintenance device. The probe contains a course
wire screen near the base of the flexible neck to prevent fibers and large particles from being
drawn into the photometer. In addition, there are screens in each of the two round nozzles that
thread onto the flexible neck. The blue rectangular nozzle contains no screen.
If the screens accumulate a significant amount of debris and become partially clogged, it can
interfere with the airflow and affect the accuracy of the photometer and may put an unnecessary
strain on the vacuum pump.
It is recommended that all screens be wiped clean with a lint-free cloth before use each day.
If the screens are punctured, replace them immediately. Spare nozzles and replacement scanning
probe components can be ordered from ATI (see Section A-4).
To access the screen in the flexible neck, unscrew the flexible extension from the probe body. A
small tool may be necessary to reach into the neck to remove and wipe the surface of the screen.
4.6 REPLACING THE MAIN POWER FUSES
Position the 2H with the rear panel readily accessible. Locate the fuse block at the center of the
power entry connector. Press the top and bottom tabs toward the center and pull the fuse block
straight out from the power entry connector. The two (2) fuses will be exposed for inspection
and/or replacement. Replace the fuse block by gently inserting it back into the power entry
connector until the tabs snap back into their original location.
4.7 REPLACING THE HEPA EXHAUST FILTER
Position the 2H with the rear panel readily accessible. Rotate the HEPA exhaust filter in a
counter-clockwise direction until the threads are free of the rear panel bushing. Install the new
replacement filter in the same orientation as the filter that was replaced. Care should be taken to
avoid cross-threading the filter housing. When installed correctly a cylindrical well should be
visible through the filter port. This design directs exhausted airflow to the outside of the filter
media core, providing greater surface area and prolonging service life.
To Next Page
Loading...
Need help?
General
