
36 BD FACSAria II User’s Guide
Figure 1-18 Transmission pathways in an octagon
Detectors
A standard system is equipped with an octagon containing six PMTs, that detect
light from the 488-nm (blue) laser, and a trigon containing two PMTs, that detect
light from the 633-nm (red) laser. The third-laser option adds an additional
trigon containing two PMTs to detect light from the 405-nm (violet) laser. If the
optional 375-nm (near UV) laser is installed, it uses the same PMTs as the violet
laser.
Optical upgrades are available to fill the remaining PMT slots for a two- or three-
laser system. A fully-equipped system can detect up to 13 fluorescent markers
and two scatter parameters at a time.
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