I have a 55 Gallon Drum with a PPM sensor inside it. I need to pour water and 3 Concentrates until the drum is filled, indicated by a level sensor. I also have an inline Water flow 4-20ma transmitter.
The liquid Ice Tea concentrates, are poured into the drum according to the each customer’s ratio and PPM selected in the EZ-Touch.
For the sake of this argument let’s say that the customer selects 1,200 PPM along with this ratio;
100% PART A
50% PART B
25% PART C
At the same time the water solenoid opens I also start the 3 peristaltic pumps for parts A-B-C. I can easily take care of the ratio by timing the ON time of each peristaltic pump. 100 seconds for part A, 50 seconds for part B and 25 seconds for part C.
The real challenge comes when trying to meet the 1,200 PPM. Since the strength of this 3 Ice Tea concentrates constantly changes with each batch I need a way to teach the ladder logic how to best prepare this recipe and reach the PPM level required with a plus o minus 5-10% PPM margin of error.
Does anyone have an idea on how to best do this logic?
The liquid Ice Tea concentrates, are poured into the drum according to the each customer’s ratio and PPM selected in the EZ-Touch.
For the sake of this argument let’s say that the customer selects 1,200 PPM along with this ratio;
100% PART A
50% PART B
25% PART C
At the same time the water solenoid opens I also start the 3 peristaltic pumps for parts A-B-C. I can easily take care of the ratio by timing the ON time of each peristaltic pump. 100 seconds for part A, 50 seconds for part B and 25 seconds for part C.
The real challenge comes when trying to meet the 1,200 PPM. Since the strength of this 3 Ice Tea concentrates constantly changes with each batch I need a way to teach the ladder logic how to best prepare this recipe and reach the PPM level required with a plus o minus 5-10% PPM margin of error.
Does anyone have an idea on how to best do this logic?