AS-LLE Liquid Point Level Sensor

The Model AS-LLE  is a miniature, single-point level sensor for detecting and alarming on liquid levels in tanks, reservoirs, sumps and gearboxes on commercial and military fixed wing and rotary aircraft. Unlike ordinary level sensor that installed through a tap point in a vessel and protrude both into and out from the vessel, the AS-LLE is designed to be installed within the vessel itself.  There are no external penetration points to leak or that require additional external space to accommodate their installation.  The AS-LLE can be used with most any liquid, including water, oil, hydraulic fluid, coolants, and more.  Its titanium construction ensures it is rugged, lightweight, and corrosion resistance. 

Download the AS-LLE data sheet and complete and submit the included Application Data Sheet or contact the FCI-Aerospace Sales Representative in your area to receive a technical quotation for your Liquid Level Element application.


  • Coolant reservoirs
  • Water tanks


Service: Liquid level point detection

Material of Construction: Titanium Ti 6AL-4V, per AMS 4928 

Process Connection:  Sensor body has integrated extension panel with 0.219" hole for attachment to in-tank mounted bracket

Electrical Connection: potted, flying leads

Excitatiion Current: 75mA. ON for 30 seconds, OFF for 120 seconds

Temperature Service: -67° to 400°F [-55° to 205°C]

Pressure Service:  Operating to 3000 psig [207 barg]; Proof to 6000 psig [414 barg] 

Weight:  1.6 oz [45 g]

Reliability (MTBF): 500,000 hours

Qualifications: RTCA/DO-160, Fluid compatibilty, temperature cycling, vibration, endurance test

Quality System Approvals: ISO9001 and AS9100