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I'm looking for a non-invasive/non-contact level sensor with switching PNP output, DC excitation that can detect a low dielectric liquid within a polypropylene (0.25 in wall) 5-L bottle.
I've tried a capacitive sensor but the liquid appears to have too low of a dielectic. These bottles are used as a vacuum trap - an intermediate liquid storage before it can be pumped off to a final container. I need the sensor to tell the pump when to turn on so the liquid doesn't get too high and go into the vacuum
system. Other constraints: there are many of these bottles and only a few machines that they are used on. I'd like to spend, at most, US$500 per machine for some type of sensor. So the bottles themselves would just be place into a "nest" that contains this sensor. I'm currently wired for +/- 24VDC and a PNP output to be recognized by a PLC. This was for a capacitive sensor that worked with water runs but not on the
final media. Ideally, I'd like to plug an alternate sensor in place, but changing the PLC code is an option.
I've tried a capacitive sensor but the liquid appears to have too low of a dielectic. These bottles are used as a vacuum trap - an intermediate liquid storage before it can be pumped off to a final container. I need the sensor to tell the pump when to turn on so the liquid doesn't get too high and go into the vacuum
system. Other constraints: there are many of these bottles and only a few machines that they are used on. I'd like to spend, at most, US$500 per machine for some type of sensor. So the bottles themselves would just be place into a "nest" that contains this sensor. I'm currently wired for +/- 24VDC and a PNP output to be recognized by a PLC. This was for a capacitive sensor that worked with water runs but not on the
final media. Ideally, I'd like to plug an alternate sensor in place, but changing the PLC code is an option.