The patent-pending 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.


RU Flex HLS Test Apparatus

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!