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liquid level sensor

Former Member

hi,

i am designing a remote monitoring system for a small solar water heater. in this set up the water vapor is condensed and is collected in a container.I need to find a suitable sensor for measuring the collected liquid level.The amount of liquid collected is very minimal and the container is open at the top.If anybody have a suggestion please reply immediately.

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    Any capacitance measurement circuit can be used to measure water depth as accurately as as your capacitance meter. The capacitor "plates" to be measured are simply vertical wires running up the length of your container. The capacitance between the wires is directly proportional to the depth of water. One of the wires cannot be permitted to contact the water, so it needs to be insulated wire - I just run an insulated wire to the bottom and back up, to avoid having to seal the bottom end. The higher the dielectric constant of the wire, the larger the capacitance reading. For your small depth application you should use teflon coated wire for a high capacitance, but you can also increase capacitance simply by running more loops of wire to the bottom and back.

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    Any capacitance measurement circuit can be used to measure water depth as accurately as as your capacitance meter. The capacitor "plates" to be measured are simply vertical wires running up the length of your container. The capacitance between the wires is directly proportional to the depth of water. One of the wires cannot be permitted to contact the water, so it needs to be insulated wire - I just run an insulated wire to the bottom and back up, to avoid having to seal the bottom end. The higher the dielectric constant of the wire, the larger the capacitance reading. For your small depth application you should use teflon coated wire for a high capacitance, but you can also increase capacitance simply by running more loops of wire to the bottom and back.

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