The RU Flex 2100 DLS is a flexible, extremely rugged, chemically and abrasion resistant digital level sensor offering continuous, accurate, and reliable monitoring of tank level and temperature. With the addition of the High-Level Shut-In option, the sensor offers level measurement (product and water interface), temperature measurement (at up to 8 locations) and high-level overflow protection. All in a single sensor installed in a single tank port!


With the addition of a third float, the RU Flex DLS with High-Level Shut-In provides two digital outputs: one for a high-level alarm and one for a high-level shut-in. This is all accomplished with two distinct circuits: one for normal continuous level and temperature measurement, and the other for high-level alarm shut-in. The high-level alarm shut-in requires no power and, unlike competitors’ sensors, is not affected by power outages.


With the 36” flexible diameter, one person can install the sensor in 15 minutes. Available with 3/16″ measurement accuracy when ordered with 1/8″ resolution. This sensor is ready for API 18.2 custody transfer level measurement requirements. Ships standard carrier in a box.


Easy to ship, easy to install, easy to maintain!


High-level alarm requires no power and is not affected by power outages

Integrated test device allows for required testing of the high-level shut-in feature at any time without opening the tank hatch

All stainless steel parts treated with e9 Treatments Metal Pro anti-paraffin surface treatment to reduce need for maintenance

No ongoing calibration after initial offset

Measure and monitor up to two levels, eight temperatures, including high-level overflow protection with a single device


The RU Flex with HLS Model 2100 DLS effectively measures levels of fluids with multiple densities:

  • Crude oil

  • Diesel

  • Kerosene

  • Salt Water

…And many others!