Sharp 5030i/5014i - Cleaning the Filter Assembly
Occasionally the filter assembly needs to be taken apart and cleaned. Gaps in the PM10 inlet screen
can allow insects and debris to get trapped in the filter chamber. Wood smoke can cause sticky
deposits to build up on the top plate. This can lead to the filter tearing or jamming.
When dismantling the filter assembly, great care needs to be taken so that the detector and its
protective film are not damaged. The following is a step-by-step procedure for cleaning the filter
assembly.
1.
Turn off the instrument and unplug the power. Disconnect the heater.
2.
Remove the Nephelometer (5030i only) by undoing the electrical cable, loosening the two
side screws and then lifting straight up.
3.
Remove the 2-part lid, first the small filter assembly cover, then the larger lid. Set them aside.
4.
Remove the two 4mm bolts holding the inlet tube in place. Slide off the green clamping
brackets and the inlet adapter. Cut the tape close to the plastic guide and then loosen the
brass knurled nut on the take-up spool and slide off the tape. See Photo 1.
Photo 1 – Remove inlet support bracket and tape
