介绍了一种用测色法来判断滴定终点的全自动酸碱滴定仪。该仪器采用蠕动泵驱动滴定剂,用光电开关检测滴定剂滴数,根据滴数计算所用滴定剂的体积。测量的全过程由微型计算机控制,自动完成滴定过程,实现对微量离子浓度的测量。具体给出了酸碱滴定原理、总体结构及硬件配置。在该滴定装置中,没有与滴定剂溶液接触的活塞,同一滴定装置就可用于酸、碱滴定,简化了滴定装置。 An automatic acid-base titrator for determining the end point of titration by colorimetry is introduced. The instrument uses a peristaltic pump to drive the titrant, titration with a photoelectric switch drops, according to the number of drops to calculate the volume of titrant. Measurement of the whole process by the microcomputer control, automatic titration process to achieve the measurement of trace ion concentration. Specific gives the principle of acid-base titration, the overall structure and hardware configuration. In the titration device, there is no piston in contact with the titrant solution, and the same titration device can be used for acid and alkali titration, simplifying the titration device.