Manual, Ultra High Sensitivity Aerosol Spectrometer (UHSAS)
DOC-0210 Rev E-4
4 6
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
11.0
Controls Tab
The
Controls
tab sets the sample flow and monitors other parameters including sheath flow,
sample block temperature and pressure, and laser and cavity characteristics. The air flows are
measured with electronic flow controllers or meters.
The
Sample Flow
is both monitored and set on the
Controls
tab. The user can set the sample
flow by using the white slider or by typing a number directly into the white box in the lower left
of the window. The actual sample flow, which may differ from the set flow, is listed in the gray
box underneath the Sample Flow slider control. The actual flow is also indicated by the blue
portion of the flow meter.
The meters to the right of the sample flow indicate the current
Sheath flow
(sccm),
Reference
value (V), and
Scatter
value (V). The sheath flow is the flow of the buffer surrounding the sample
air; it should be 600-800 sccm. Reference denotes the laser reference voltage from the monitor
photodiode. Ideally, this voltage should be between 1.75 and 2.75. The scatter value is the
background DC molecular scatter level from the APD.
The
Temperature
field displays the ambient temperature, while the
Pressure
field shows
atmospheric pressure.
Figure 28: Controls Tab
