... or 0-200%, precision ± 1%; 3. It has auto alarm function; 4. DO sensor and signal transmission line.. 3 Foam ... control 1.Automatically control and automatically alarm; 2.Eletrode check, peristaltic pump automatically add defoamer. ... . Sensor 6 Rotate speed 1. Fully automatic control settings, With automatic alarm function 2. speed range, please checking the drawing, precision ...