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Spectradyne LLC, All rights reserved
13
Version 2.5.0 Revision 3, July 2020
Utilities
Instrument Prime
Run this sequence to prepare the instrument for running the first cartridge on startup. Follow the
prompts from the software:
➢
Load a reusable cleaning cartridge
➢
Allow the routine to complete:
o
Fill Monitor 1 and 3 sliders should reach the top.
➢
Lower the stage
➢
Remove the reusable cleaning cartridge and store it in a safe place
➢
Load the sample cartridge and run as usual
Clear Constriction
This automatic sequence is used during a measurement run to clear the sensing constriction of
the cartridge in the event of a blockage.
➢
Press
the “Clear Constriction” button
(Figure 9) and wait for the routine to complete.
➢
Continue acquisitions as normal
(press “Continuous” on Acquisition panel)
.
How much data is enough?
➢
The 1-
σ error reported for a concentration measurement in a given
size range is derived from statistical error in counting particle
detection events.
➢
Particle detection events are Poisson-distributed in time; therefore,
the error scales as 1/N
1/2
(with small corrections for N < 5).
➢
Example: N = 100 particles must be counted in a given size range to
obtain a concentration measurement on that range having standard
error of 10 %.
➢
The particle concentration (with error) measured over any user-
defined size range can be obtained in real time using the Live CSD
feature of the Auto-analysis engine.
Figure 9.
Utilities frame.