![]() ![]() ![]() A link to a spreadsheet and web service is provided that performs the calculation with your inputs. By the end of this post, we will arrive at a simplified formula to be used in PLC code which converts liquid height to liquid volume. Since the level transmitter was existing and accurately reporting liquid height this challenge was solved by code alone. The liquid level was measured by a sonic level transmitter. The presentation of tank contents to the operators as liquid height was a poor choice indeed. ![]() This meant, for a given waste inflow rate, the tank would appear to fill slowly at mid point and then, as level increased, the fill rate would apparently accelerate. The manual time estimation proved to be difficult for Operations since the tank filled over the course of weeks and the heightof the liquid in the tank was monitored, not the volume. When this occurred, a mess had to be cleaned up and the agony of regulatory oversight paperwork infuriated management. If the truck was called too late, the tank would overflow into a secondary containment. If the truck was called too soon, money was wasted since the waste company charged a flat haul rate in addition to a per gallon charge. The operation needed an accurate "time to full" value since the waste had to be hauled off by tanker truck. Not all technical challenges need hardware.Įarly in my automation career I was tasked with automating the estimationof time until a horizontally mounted, cylindrical solvent waste collection tank reached capacity. ![]()
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