Teledyne API Ultrafine Particle Monitor - Model 651 Maintenance, Service, and Troubleshooting
07506C DCN6727 79
Removing and Installing the Wick The wick should be replaced every 4 weeks (800 hours). To replace
a wick, follow these instructions:
1. Unscrew the top of the spare wick cartridge and insert a new,
dry replacement wick.
Figure 9-1
Loading New Wick Into Spare Wick Cartridge
2. With the Model 651 powered on, disconnect the water supply.
3. Press SETUP and turn the VACUUM to OFF.
4. Loosen the thumb screws holding the inlet screen assembly in
place and pull off the assembly.
Figure 9-2
Removing Inlet Screen Assembly
5. Loosen the sampling inlet jack-screw using the supplied 1/8”
Hex ball driver, and slowly turn the screw. As you turn the
screw, the nozzle and wick cartridge will gradually be pushed
out of the instrument. Grasp the sampling inlet and carefully
pull it from the instrument.