EMurphy
Member
We have a few filling machines at work that utilize 2 normally closed capacitive sensors emulating float switches. These machines are relay controlled.. No plc. I have no ladder diagrams. I have had to construct a similar system to keep a tank full. It's basically a standard seal in circuit. Question is these sensors are 2 wire types. So there's 2 sensors in series before the coil. I'm using a 78 series automation direct relay. Is there something I should know about here. It appears the relay light is always on. Although dim. I don't have much experience with 2 wire sensors in series. Thanks for any help