For the fuel consumers and the fuel industry, Electronic Sensors, Inc. (ESI) offers products that monitor a wide range of fuels. ESI provides sensors that work with gasoline, ethanol, diesel, bio-diesel, and various related fluids (including oil, DEF, antifreeze and water).

ESI’s Level Devil ® modular design option works with many applications and environments—allowing our customers to start small and finish big. We offer controllers that can monitor from 1     to 99 tanks. No need to try and project your finished solution: we grow our systems with you as you grow!

Communication Options:

  • Cellular coverage from all major providers
  • Wireless local area network (WiFi)
  • Ethernet via direct connection to a modem
  • Land lines for those places not yet modernized


  • Solar power recharges internal battery for around-the-clock operation.
  • AC power directly to power supply for more than enough power.
  • Batteries run on Lithium Ion technology for once-a-day reporting, and for an occasional alarm report.


  • Differential Pressure Sensors- compare the pressure difference between two values to calculate volume and height. In a typical case, the two values are the pressure at the top of the tank versus the pressure at the bottom of the tank.
  • Intrinsically safe systems – designed for Underwriter Laboratories’ standards for hazardous fluids.


Why Level Devil?