Level Sensing For Hydraulic Lifts in Longwall Mining Equipment


Hydraulic lift system is used to raise and lower an arm on a shearer (also called a power loader) to cut coal from the coalface. Reliable hydraulic oil level sensing is required to maintain continuous operation efficiently and safely.


Challenge: Hydraulic oil coating the prism on optical sensors causes inconsistent sensing of critical fluid level creating concerns over reliability. The sensor is unable to accurately detect fluid levels.


Optical type sensors used in these applications are subject to coating build-up and other reliability concerns due to the LED refraction technology used. Coating present on the prism can prevent repeatable detection of hydraulic oil level, limiting the sensor’s accuracy.

 Gems Sensors’ Universal Liquid Level Sensor (ULS-100)

Universal Level Sensor

The Gems Universal Level Sensor tolerates coating with a flush PBT/PC blend sensing face. Its compact, rugged construction features a durable IPX7 & IP6k9k sealed design and a wide temperature range for use in harsh environments. The Gems Universal Level Sensor was developed with extreme aqueous, oil and hydrocarbon applications in mind.


Universal Level Sensor Features & Benefits: 

  • Durable sealed design – IPX7 & IP6k9k 
  • Developed for the most rugged aqueous, oil and hydrocarbon applications 
  • Tolerates coating
  • Wide temperature range
  • Excellent in harsh environments