In this application we have sump which collects storm water. From the sumps storm water is pumped to storage vessel through a 4" PVC pipe. (From the storage vessel it goes to oil water separator.) However in situation of catastrophic failure sump could be filled with diesel fuel and will be pumped to storage vessel. We wanted to have some kind of sensor on 4" PVC pipe so that it recognize that there is no water in pipe but its filled totally with oil and it should send signal to control panel to stop pumping oil from sump.
Any suggestions? Thanks.
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