| 摘要 |
PROBLEM TO BE SOLVED: To improve maintainability, and size and cost reduction by forming a sample sucking mechanism for a flow cell using an electromagnetic pump. SOLUTION: A spectrophotometer is provided with a flow cell 3, an electromagnetic pump 8, a waste liquid tube 9, a suction nozzle for sample 6 and so on. The pump 8 operates on pulse exciting given by a control circuit 5, sucks the sample 6 to the flow cell 3, and discharged through a tube 9 after the completion of measurement. Regulating frequency of pulse exciting optimizes sucking accuracy under conditions of a flow passage such as piping inside diameter and sample viscosity. The suction nozzle, pump 8 and the tube 9 are composed of Teflon series material, which is capable of measuring a sample such as organic solvent. Sample suction requires the tube to be drawn through hands, therefore, there is not any aging change in suction amount due to tube deterioration, and the pump 8 of small type and low power model is available for operation, thereby reducing an installation space. |
