TSI Instruments SIZER 3321, User Manual

Page: 39 / 101

APS
TM
Spectrometer Operations 4-3
Table 4-1
Description of Menu Items
Command
Function ( see also Appendix C for serial commands
related to Menu Items ).
Exit Exit the Menu and display graphical information.
Sample Time [s] Set the total sample time. Can be set from 1 to 64,800
seconds (18 hours) in summed mode and from 1 to 300
seconds in average mode. Default is 20 seconds.
Sample Mode Select Summed|Averaged|Sum.Corr. Summed
displays the total number of particles sampled for each
channel. Averaged displays a calculated average
number of particles sampled for each channel. Sum.
Corr will not show useable data at the sensor’s LCD
display. Use the APS
™ spectrometer software to
interpret. The default is Summed.
Sample Type Continuous|Single . Continuous sampling begins a new
sample immediately following the end of the previous
sample. Single sample takes one sample for the set
sample time and then stops.
Pumps Turn pumps on and off. Default is on.
Sound Turn on and off the beeping sound that is activated when
the Hi-Conc. limit is exceeded. The default is on. If
necessary, set (reset) the limit from the computer software
setup program as described in
Chapter 5 or using a serial
data command as described in Appendix C .
Baud Rate Select the baud rate at which the sensor will
communicate with your computer. Use the control knob
to select: 38400, 19200, or 9600. The default is 9600.
Note: 38,400 must be used in correlated mode.
Inlet Pressure
[mbar] Displays the current inlet pressure of the sample. This
value should correspond to your atmospheric pressure.
No default value.
Sheath Flowrate
[lpm] Displays the flow rate of the outer nozzle (sheath)
aerosol. This reading will approximate 4.0 liters (±0.1)
per minute. No default value.
Aerosol Flowrate
[lpm] Displays the flow rate of the inner nozzle (sample)
aerosol. This reading will approximate 1.0 (±0.1) liter per
minute. No default value.
Total Flowrate [lpm] Displays the total flow rate of the sample aerosol. This
reading will approximate 5 (±0.2) liters per minute
(unless sheath or sample flow has been modified). Used
to verify proper sensor operation. No default value.
Optics
Temperature [

C]
Displays the temperature of the optics components.
Used to verify proper sensor operation. No default value.
Note: This is also the APD detector temperature.
Cabinet
Temperature [

C]
Displays the temperature inside the APS
™
spectrometer. No default value.
Laser Current [mA] Displays the laser current in milliamps. Range should be
between 0 and 100 mA
. This value rises as the laser
ages. Used for diagnostic purposes.