An Upgrade Pack is available to upgrade your old 3550 into a Model 3551 using the latest available state-of the art technology in the preconcentrator industry. The Upgrade Pack consists of a new software and a new control board to replace the two boards in the old design. The board replacement is quick and easy and only takes a few minutes to upgrade & enjoy all the benefits of the new model 3551 .

Figure 1. Old model with two control boards
Figure 2. Unplug all connectors
Figure 3. Replace the control board Figure 4. Plug in the connectors
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