DC Fuel Probes
Grounded Outer Tube

Product Overview
The LMS Grounded Outer Tube DC Fuel Probe is compatible with a 200v/m EMI environment.  The probe utilizes two composite tubes as the capacitive elements.  The outer tube is grounded to the airframe, providing a Faraday cage shield around the probe components thus shielding the diodes from the 200v/m EMI levels.  The two tubes are structurally joined by a nickel-plated bottom cap, flange or top cap with an EMI connector.  To prohibit arcing, the minimum distance between the two concentric tubes is 0.25 inches.  The probe retains all the advantages of the LMS Graphite Composite Probe.  The weight reduction benefit is especially noticeable when compared with metal two-tube or 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.

Aircraft Compatibility
The LMS Grounded Outer Tube DC Probe is presently in production and being delivered for the CH-47F, UH-1 and AH-1 aircraft upgrade programs and EMI testing has been successfully completed.

- Rigid two-composite 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

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