Maintenance, Service, and Troubleshooting Teledyne API Ultrafine Particle Monitor - Model 651
82 07506C DCN6727
4. Noting the direction of
flow, push the ends
(easier than pulling) of
the tubing off both ends
of the filter (Figure 9-6).
5. Attach the tubing to a
new filter making sure
the flow direction
matches that of the filter
you removed.
6. Remove the filter inline
filter screen.
7. Push the filter into the
filter clip.
8. Replace the instrument
cover.
Inline Screen
Direction of
Flow
Figure 9-6
Changing Filter
The correct aerosol sample flow rate is essential in the determining
of aerosol concentration. For this reason, it is important to
periodically verify the sample flow rate. This is especially important
after changing the wick or other activity which may result in the
contamination of the optics nozzle or orifice (filter change).
To verify aerosol sample flow rate, follow the instructions presented
in this section.
The flow schematic below shows the auxiliary, transport and
sample flows through the Model 651.
Note: Check each flow after every wick change.