SST Sensing and Sparkfun recently developed an easy-to-use solution for single-point liquid detection using infrared technology. Highly accurate and reliable, the solution features an Optomax Digital liquid level switch, which is connected to an Arduino board via the TTL output and powered by the 5-V source. 
Whether you’re a professional engineer or DIYer, you’ll find it easy to program the Arduino’s LEDs to indicate when the sensor is immersed in liquid (and thus determine if the liquid level is too high or low). The compact switch lends itself will to space-constrained applications. With long cabling, you can place the sensor near a liquid without putting the other electronics at risk. Since this is an optical solution, you can avoid a variety of issues (e.g., jamming and wear and tear) and ensure long operational lifespan.
SST offers the liquid level switch in a robust housing tip with either a Polysulfone or Trogamid construction (depending on the particular application requirements). The complete solution has an operational temperature range of –25°C to 80°C.
Source: SST
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