There are hundreds of transducer type sensors in the market today. There are a few things that set them apart. Most of these type of sensors use pressure on a thin wafer type sensor to measure the depth of water or even the pressure of the air. The other main sensor type is called a vibrating wire piezometer. This sensor uses a tiny wire and measures the vibration frequency of the wire when plucked by the sensor. The depth of the water changes the frequency of the wire.
Some of the pressure sensors available have a built-in datalogger and these are often used in ground water monitoring due to their small form factor and ease of use and installation. We sell and support the Campbell Scientific CRS451/CRS456 water level and temperature dataloggers, and the Onset HOBO Water Level Loggers. These sensors have built-in dataloggers and are easy to deploy for measuring water levels in a variety of applications.
Datalogger and Sensor Integration
By combining a pressure transducer or vibrating wire sensor with one of the Campbell Scientific dataloggers you can create a rugged and flexible water level monitoring system. The CR200X series, CR300, CR800 series, and CR1000 dataloggers can read many different types of outputs and offer reliable data collection and can be implemented as a control system or warning system in many types of applications.
There are many sensors available here are a few we recommend. Contact us if you need something else; we can generally match what you are seeking.