OD90 vs OD135

Definition

The two photodiodes on the eVOLVER are at 90 degrees and 135 degrees from the IR LED.

Recommendations

  • Try OD135 for OD600 < 0.5

    1. There will likely be vials that max out between OD600 0.5 and 1.0

  • Try OD90 for OD600 > 0.5

    1. Some eVOLVER systems are able to read OD90 up to OD600 of 4 or 5

    2. This may require optimization of the internal resistor pack

  • Switching between currently requires manual OD calibration (can be applied to an existing GUI calibration you have on your eVOLVER)

  • See this forum post for an example

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