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Robust liquid level sensing with conductive fluids?
Part Number: FDC1004
Does Fdc2214 detect liquid level better for conductive and sticky liquids? We have tried fdc1004 but the results are thrown off if the liquid sticks to the wall. Anything we can change or modify to get readings with higher proximity into the container or is Fdc2214 a better option for this?
Sticky liquids will always be a problem for capacitive liquid level sensing. The FDC2214 will perform much better for conductive liquids than the FDC1004, but both will have trouble with sticky liquids. I recommend using ultrasonic level sensing instead of capacitive level sensing for sticky liquids.
The TDC1000 has some EVMs specific to liquid level sensing: http://www.ti.com/product/TDC1000/toolssoftware
Current and Position Sensing
For more information, check out the Inductive Sensing FAQ
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In reply to Kristin Jones93:
We have a constraint that can use only capacitive sensing. We observed that the level is really accurate when pouring into the container but the results are off when pouring the liquid from the container and allowing the liquid to rest. Is there any config Change we could do to allow the sensor to have greater penetration into the container to detect liquid level or to be able to make it work for the use case of liquid pouring outside the container.
In reply to Jasmine Drew:
Increasing the size of the sensor will increase the detection distance, but if your sensor setup relies on the fringe capacitance between an electrode and ground (or two electrodes), then this likely would not help significantly. Using the FDC2214 with larger sensor electrodes might have better results, but sticky liquids will always be a problem for capacitive level sensing.
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