Low-Power RS485 Modbus Tank Level Gauging Solution

RL3 | RL4


  • Monitor product, interface & temperature using a single Resistive Level Sensor
  • 1/2” or 1/4” sensor option / flex or rigid
  • ± 1/8” accuracy on 1/4“ sensor / ± 1/4” accuracy on 1/2“ sensor
  • Modbus or LevelMaster interface
  • Self-contained, rugged design
  • Installs in minutes with Quick Connect that eliminates sensor wiring error and hassle
  • Class I, Division 1 (Zone 0)
  • Intrinsically Safe
  • IP66, -40 °C to 70 °C
  • 6-12 Vdc
  • Supports up to 16 sensors multi-dropped

Ultimate Level Sensing Solution

The OleumTech® H-Series Resistive Tank Level Sensor is the superlative hardwired tank level monitoring solution. This accurate level monitoring instrument has the ability to monitor product, interface, and temperature levels using a single OleumTech Resistive Tank Level Sensor. OleumTech’s patented Resistive Sensors are offered in both flexible (PTFE) and rigid (316 SS) materials in various custom lengths. The 1/4” resolution sensors mate with the HW5800-RL3 and HW5800-RL4 versions. The 1/2” resolution sensors mate with the HW5000-RL3 and HW5000-RL4 versions.

Reliable, Scalable, and Safe

The field-proven level sensor can communicate with any Modbus master or LevelMaster device via RS485 Serial connection. The low-power Resistive Level Sensor can be multi-dropped of up to 16 sensors. Additional data such as volume and tank full percentage can be calculated and reported as well, along with the core level variables. The Resistive Level Sensor is certified for use in Class I, Division 1 (Zone 0) hazardous locations.

This product is also available with wireless connectivity and a local display.

This product is also available with wireless connectivity.