08354B DCN7877
Teledyne API T640 PM Mass Monitor
69
MAINTENANCE PROCEDURES
This section provides cleaning and maintenance information for the inlets and
filters.
CLEANING THE T640 INLET
Figure 5-1. T640 Inlet (standard)
1. Power off the pump from the Setup>Vars>Pump Control menu. Pump choices
are ‘auto’, ‘off, and ‘cleaning cycle’. Press ‘edit’ and the ‘off’ to turn off the
internal pump. (Note: ‘cleaning cycle’ is a mode that pulses the internal pump
to help dislodge any obstructions between the optical cell and the internal
DFU).
2. Remove the sampling inlet from the sampling line.
3. Place the flow audit adapter with HEPA filter on the downtube to minimize
opportunity of dust entering the sample line and monitor.
4. Disassemble the sampling inlet: two screws at base of inlet and base plate.
5. Carefully and thoroughly remove any dust deposits from inside of the inlet.
6. Remove any insects or other debris from the filtering screen.
7. Clean all the components using water and a mild detergent, if necessary.
8. Dry all components thoroughly with a clean cloth and blow compressed air
through nozzles.
9. Check and, if needed, replace the o-rings located on the outside and the inside
of the base plate, and grease them with vacuum grease.
10. Re-assemble the sampling inlet, sliding the baseplate back into the base of the
inlet body, making sure to line up with the screw holes. The screws should be
put back in to hand-tight pressure.
11. Reconnect sampling line.
12. Power up the pump from the Setup>Vars>Pump Control menu.
This procedure should be repeated per the schedule in Table 5-1.
