The motor is geared down to run at about 20 rpm. I will need it to go from zero to full speed over the course of 7 to 0 pH values. It will be driving a peristaltic pump, which will be pumping fairly thin acid into a waste stream. Not a lot of torque required, but need to keep up with the demand...
I am working on a control project, trying to tie together a 4-20 mA signal from a pH controller and a dc operated gearmotor of about 20 " lbs of torque. What is the best, and least expensive method of controlling the gearmotor to vary speed in conjunction with the varying mA signal from the...
