Maintenance
The inside of the sample tube can be cleaned using the sample tube
cleaning brush provided, along with a light solvent. Dry the tube by
blowing it out with compressed air, or let it air-dry thoroughly. Be
careful not to blow particles into the D
USTTRAK monitor inlet port.
7. Insert the sample tube back into the port and screw it in using the
sample tube removal tool.
8. Replace the inlet nozzle and O-ring.
9. Perform a zero check and re-zero if necessary.
10. Turn the D
USTTRAK monitor off and turn it on again while pressing and
holding the CALIBRATE key. This action resets the internal circuit that
keeps track of the total aerosol quantity that has gone through the
instrument. The inlet port cleaning procedure is now completed.
Replacing the Internal Filters
The internal filters should be replaced based on the schedule in Table 4–1 or
when the “SERVICE 5” is displayed during power-up. This “service
reminder” will appear each time at power-up, until you reset this message.
To reset the “SERVICE 5” reminder, do the following:
1. Turn the instrument off.
2. Press and hold the CALIBRATE key while turning on the instrument.
3. The service message is now reset.
If you change the filters before the “SERVICE 5” message appears, you
should reset this reminder by using the same technique.
The operation of the built-in total mass tracking circuit is dependent upon
the instrument calibration and the instrument flow rate. The assumed flow
rate is 1.7 L/min.
To replace the internal filters, follow the procedure below. Refer to
Figure 4-3.
1. Move to a relatively clean environment (aerosol concentration less than
0.1 mg/m
3
).
2. Turn the D
USTTRAK Aerosol Monitor off.
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