Fuel level sensor LMS’ DC

capacitivemVfor aircraft

DC Fuel Probes LMS’ DC Fuel Probe is compatible with a 200v/m EMI environment. The probe utilizes two graphite composite tubes as the capacitive elements. The outer tube is grounded to the airframe which provides a Faraday cage shield around the probe components. This design shields the diodes from the 200v/m EMI levels. The two tubes are structurally joined by a nickel-plated cap or flange, and linked to the system with an EMI connector. The design protects the probe elements fromarcing. The weight reduction benefit is especially noticeable when compared with metal two tube and three-tube designs. Fuel Density Measurement The LMS DC Fuel Probes are density compensated by measuring temperature and using a proprietary LMS design for correcting the variation of dielectric constant to fuel density. DC Fuel Probe Features Robust two composite tube design with EMI compatible outer tube Won’t dent, scratch or absorb hand oils Low level capability Full density compensated probe No coaxial shielding (over-braid only) Lowest cabling complexity No outer tube shorts to ground More accurate pre-calibrated system No friction or riveted electrical connections No fatigue or cracking under high vibration or slosh loads Half the weight of three-tube aluminum EMI probes