Maintenance
11. Zero the mass tracking circuit to turn the service message off. This is
done by pressing and holding the CALIBRATE key during power-up.
The procedure is now completed.
Setting the Flow Rate
The sample flow rate through the D
USTTRAK monitor is set at the factory at
1.7 L/min. The flow rate can be easily adjusted if necessary by following the
procedure below. You need an instrument that precisely measures flow rate
for use as a reference such as the flowmeter supplied with the D
USTTRAK
monitor.
Note: The mass concentration readings are not affected by flow rate
changes because the volume of sampled air “seen” by the
D
USTTRAK detector is fixed. Flow rate is critical when using the
cyclone or other aerosol separation devices.
1. Clean the inlet port as described in this chapter. If necessary, replace the
internal filters as described in this chapter.
2. Connect the flowmeter to the D
USTTRAK monitor sample port using the
tubing provided.
3. With the D
USTTRAK monitor running, use the supplied screwdriver to
turn the flow adjustment screw located on the back of the D
USTTRAK
monitor (see Figure 4–4). Observe the reading on the flowmeter
(reading is taken at the center of the ball) and adjust the flow until the
desired reading is obtained. The factory setting is 1.7 L/min.
4. Disconnect the flowmeter. The procedure is now completed.
Figure 4–4: Adjusting the Flow Rate
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