Chapter 3
16
Flow Cal
Flow Cal is run if the user wants to change the flow set point. The flow set
point is factory set to 3 L/min total flow. 2 L/min of the total flow is
measured aerosol flow. 1 L/min of total flow is split off, filtered and used for
sheath flow. There is an internal ∆P flowmeter in the D
USTTRAK™ DRX
instrument that controls flow rate to ±5% if factory setpoint. It is
recommended to check the flows with an external flow reference meter,
especially when collecting data. The pump will automatically start when
entering the Flow Cal screen.
1. Attach a flow calibrator (reference flow meter) to inlet port. You may
use a bubble buret, mass flow meter, dry piston or rotameter as flow
measurement devices.
2. Move the arrows up or down to achieve desired flow on the reference
flowmeter. Each up or down arrow will change the flow about 1%.
Allow time between button presses to let pump change to the new
flow rate.
3. Select save once the desired flow rate is achieved. Select Undo to return
to the factory set point.
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