The eTape sensor is a solid state, continuous (multi-level) fluid level sensor for measuring levels in water, non-corrosive water based liquids and dry fluids (powders). 

The sensor is compressed by hydrostatic pressure of the fluid in which it is immersed resulting in a change in resistance which corresponds to the distance from the top of the sensor to the fluid surface. The eTape sensor provides a resistive output that is inversely proportional to the level of the liquid: the lower the liquid level, the higher the output resistance; the higher the liquid level, the lower the output resistance.

eTape^® liquid level sensor is fully assembled in a clear, elliptical polycarbonate tube to protect and stabilize the sensor.

  Sensors are stocked in 5-inch, 8-inch, 12-inch, 18-inch, 24-inch, and 32-inch sizes.  Available with a standard voltage divider output or optional 0-5VDC output or 4-20mA output. 

datasheet eTape
datasheet 0-5V module
datasheet 4-20mA module