Pumping photometric meter of sea water nutrient salt field automatic analyser

The utility model relates to a pumping type photometer, which is a key component of a novel seawater nutrient salt on site automatic analyzer; the utility model consists of a pump body, a base seat and a controlling system. The output axle of a stepper motor drives the gear of a transmission mechanism to rotate, and drives a piston in a glass pump line through a transmission rack to perform a reciprocating motion, to extract seawater samples and to add reagents. A monochromatic miniature light source is arranged at the end of the pump body, an optical receiver is arranged at the front end of the piston, the light transmitted intensities of the seawater samples and the seawater samples added with reagents under changeable light path are surveyed through piston moving, therefore the seawater nutrient salt automatic analyzing is realized.