Figure 1
Schematic diagram of the Sample Changer. The sample plate mounted on a XYZ table is moved to the pipetting needle. Solution in a well is loaded in the exposure capillary by suction, aspirated by the syringe pump through the valve set in position 1. The syringe pump is also used to flow the solution in the capillary during exposure to X-rays. After exposure, the solution can be recuperated back into a sample plate. The cleaning station moves to the pipetting needle and the valve is set in position 2. The solution path and the outside of the pipetting needle are successively washed, rinsed and dried in three cleaning wells, with the exhaust flows terminating in a waste container aspirated by a Venturi pump. Both the sample-positioning and cleaning operations are controlled using a camera. |