| 摘要 |
A fraction volume measurement assembly for measuring and dispensing a predetermined volume of a sample, said assembly comprising a measurement tube having a lower end and an upper end, said lower end including an opening for permitting the sample to enter and leave the tube a valve in communication with the opening in the lower end of the measurement tube for controlling flow of the sample into and out of the tube an electromagnetic transmitter mounted on the tube for transmitting electromagnetic energy along a line; and an electromagnetic receiver mounted on the tube opposite the transmitter and along the line of transmitted electromagnetic energy so that when an upper level of the sample in the tube is below the line, energy transmitted by the transmitter is received by the receiver and when an upper level of the sample in the tube is above the line, the transmitted energy is refracted so it is not received by the receiver, indicating the predetermined volume of the sample is present in the tube. |
