Wireless Liquid Level – Hydrostatic (LL4/LL5)

Economical Wireless Liquid Level Monitoring Solution.

  • Wireless Hydrostatic Transmitter provides an analog sensor input (0-5 Volt, 1-5 V, 24-bit ADC)
  • LL4 includes sensor and mounting H/W
  • LL5 provides one discrete input
  • Over 7-year battery life
  • Local display for reading & configuration
  • Self-contained, rugged design
  • Class I, Division 1 (Zone 0), intrinsically safe
  • -40 ˚C to 70 ˚C / -40 ˚F to 158 ˚F
  • 900 MHz: Up to 7500 ft (2.3 km)
  • 2.4 GHz: Up to 4.3 miles (7 km)
  • Reports to a Gateway in OTC network
  • Secure AES encryption


The OleumTech® LL4 and LL5 Wireless Hydrostatic Sensor Transmitters determine level measurement by monitoring pressure at the bottom point of vented top mount tanks, deep wells, water towers, rivers, and lakes. These Transmitters are equipped with one 0-5 VDC analog input and provide high resolution 24-bit analog to digital conversion (ADC). The Transmitters can supply up to 9.5 VDC to the connected sensor.

LL4 direct mount version includes a spcified length hydrostatic pressure sensor and direct mounting solution while the LL5 allows users to select their own sensor and mounting method. The LL5 also provides one discrete dry contact input and removable wiring terminal blocks in its junction box housing to facilitate the wiring process.


The LL4 and LL5 feature a 32-character local LCD display for instantly reading process data, battery voltage, and RF strength (RSSI). When the display is set to configuration mode, users can set all of its parameters and connect to a network just using the push button interface without the need of any configuration cables.


These Wireless Transmitters rely on power from a replaceable battery. The system is engineered to achieve maximum battery life, providing +7 years of life from a single battery.


Designed for use in Class I, Division 1 (Zone 0) hazardous locations. The Hydrostatic Transmitters are intrinsically safe, meaning they cannot a cause a spark and can be serviced without being removed from a process.


The OTC Sensor Network is managed using the BreeZ Software by OleumTech, provided free of charge. These Transmitters can be configured using the push button interface or BreeZ Software.


The LL4 and LL5 communicate with an OleumTech Wireless Gateway within its network, creating a highly scalable network, accommodating virtually any I/O requirement.