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Chapter 5: Maintenance and troubleshooting
BenchCel Microplate Handling Workstation R-Series User Guide
124
Adjusting the plate-orientation sensors
About this topic
One of the causes of the “Wrong plate type” error message is the plate-
orientation sensors are not able to detect the microplate notches
correctly. To resolve this problem, make sure the microplate is in the
correct position to be detected by the sensor. In addition, you might
have to adjust the plate-orientation sensor intensity and threshold.
This topic explains how to align the microplate with the plate-
orientation sensors and adjust the notch sensor intensity and threshold.
How the plate-
orientation sensors
work Four plate-orientation sensors on the inside wall of the stacker head
detect the presence of microplate notches when the microplate is
downstacked. Each sensor contains a light emitter that transmits light
and a receiver that reads the amount of light reflected by the surface of
the microplate.
If the light beam bounces off of a wall that is perpendicular to its path,
most of the light will reflect back. The resulting reading is relatively high.
If the light beam bounces off of a wall that is not perpendicular to the
light path, the light will be deflected. The resulting reading is
significantly lower.
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Emitted light deflects
at plate notch and
produces low sensor
reading
Emitted light reflects
back and produces
high sensor reading