Ahh, a very old Osmolator! That must be at least 20 years old! A sensor plugged into the side RCA jack. A dosing pump (peristaltic pump) was plugged into the sockets. The first knob from the right seems to control a dosing interval and the second knob has a setting for shutting off immediately when the sensor hits the water or letting it run for a few sesonds more. Very cool! I think this unit is from about 1981!
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