If a PromethION Flow Cell falls below the 5000-pore warranty level, please move it to a different position on the sequencer and re-try the check. If it passes, please proceed with sequencing.

If 0 pores are found, this could be caused by the presence of a bubble between the electrode and the flow cell array.

In this case, flushing through 200 µL of Storage Buffer from the Wash Kit may help.

Please follow the steps below and then repeat the flow cell check to see if you obtain a different result.

1. Turn the valve to expose the inlet port
2. After opening the valve, a small tract of air will be visible beyond the inlet port. Draw back a small volume to remove any air bubbles:
1. Set a P1000 pipette to 200 µL
2. Insert the tip into the inlet port
3. Turn the wheel until the dial shows 220-230 µL, or until you can see a small volume of buffer entering the pipette tip
3. Using a P1000 pipette load 200 µL of Storage Buffer into the inlet port of the flow cell, avoiding the introduction of air bubbles.
4. Close the valve

If the pore count remains below the warranty level after performing the above steps, please contact the support team via Live Chat on our website.

Note: The warranty applies only to flow cell checks performed before the first sequencing run on the flow cell. It does not apply to flow cell checks performed after sequencing and washing with the Flow Cell Wash Kit.