eTape Liquid Level Sensor - 30cm
The eTape Liquid Level Sensor is a solid-state sensor with a resistive output that varies with the level of the fluid. It does away with clunky mechanical floats, and easily interfaces with electronic control systems. The eTape sensor's envelope is compressed by the hydrostatic pressure of the fluid in which it is immersed. This results in a change in resistance that corresponds to the distance from the top of the sensor to the surface of the fluid. The sensor's resistive output is inversely proportional to the height of the liquid: the lower the liquid level, the higher the output resistance; the higher the liquid level, the lower the output resistance.
This is a very unique sensor, we haven't seen anything else that is affordable and accurate for measuring liquid level. This sensor seems like it would be a handy addition to an hydroponics, aquarium, fountain or pool controller, or perhaps measuring a rain tube.
Since the sensor is resistive, it is easy to read it using a microcontroller/Arduino ADC pin
Sensor Length: 14.1" (358 mm)
Width: 1.0" (25.4mm)
Thickness: 0.015" (0.208 mm)
Resistance Gradient: 150Ω / inch (59Ω / cm), ± 10%
Active Sensor Length: 12.6" (320.7 mm)
Substrate: Polyethylene Terephthalate (PET)
Sensor Output: 2250Ω empty, 400Ω full, ± 10%
Actuation Depth: Nominal 1 inch (25.4 mm)
Resolution: 0.01 inch (0.25 mm)
Temperature Range: 15°F - 140°F (-9°C - 60°C)
For more information, check out: eTape Liquid Level Sensor Datasheet