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FCI - Model AS-LLS -Liquid Level Switch
FCI Model AS-LLS is a no moving parts, ultra-reliable level switch which detects the presence or absence of liquid or interface at the sensing location. The AS-LLS level switch is directly installed into tanks, reservoirs, sumps and gearboxes on commercial and military aircraft, as well as spacecraft, vehicles and marine applications. The sensor uses FCI proven thermal dispersion technology to rapidly detect and to signal of a too low level or too high level condition in the installation. Unlike mechanical level detection, the AS-LLS will not stick, clog or foul and no routine maintenance is required. It is small, compact and lightweight suitable for a broad range of application throughout the aircraft.
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- Oil Level Sensor
- Collection Sumps
- Automation of Sight Gauge Level Detection
- Waste or Grey Water Reservoirs
- Hydraulic Reservoirs
- Coolant Reservoirs
- Fuel Level Detection
- Oil / Water Interface Detection
- Potable Water Reservoirs
- Backflow Reservoir Detection
- Condensation Detection in Fuel or Hydraulic Systems
Service: Wet/dry level switch for liquid/air or wet/wet interface
Sensor Element Material: 316 stainless steel all welded construction
Electronics Enclosure: 316 stainless steel; hermetically sealed
Electrical Connection: D38999 or compatible
Process Connection: Flanged with O-ring seal
Insertion Length: Per customer requirement
Signal Output Options
- Sourcing output: Wet signal: source 240 mA at 28 VDC; dry signal: source Ø VDC
- Open collector output: Wet signal: closed, sinking up to 100 mA at less than 0.5 VDC; dry signal: open, leakage < 10 µa at 30 VDC
Electrical Power Input: 28 VDC nominal per MIL-STD-704
Power Consumption: 3 watts maximum
Weight: 8 oz [227g] maximum
Proof Pressure: up to 2,000 psig [138 bar (g)] as required by application
Switch Point Adjustment: Factory set at customer specified switch point
Operating Temperature Range
Sensor Element: - 65 °F to 350 °F [- 54 °C to 175 °C]
Specify actual requirement
Electronics: - 40 °F to 257 °F [- 40 °C to 125 °C]
Higher temperatures available optionally
Repeatability: ±1/8 inch [3 mm] of liquid level elevation
Time Response: 5-15 seconds typical, depending on fluid type and switch point
EMI and Lightning Protection: MIL-STD-461 and RTCA/DO-160
Qualifications: MIL-STD-810 and RTCA/DO-160
Quality Systems Approval: ISO 9001, AS9100