Fuel Gauging Systems
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Aircraft Seii^rE. and Syste-ns Fuel Gauging Systems DESCRIPTION AMETEK active fuel probes operate on the capacitance principle. Electronic circuits built into the probe measure the capacitance and produce a DC output signal. The active probe's robust signal simplifies installation and maintenance. It is immune to wiring problems such as stray capacitance, leakage resistance, or poor shield connections. The outer electrode is grounded, shielding the probe from electromagnetic interference. Current, voltage, and stored energy on the wiring are limited to 20V, 20 mA, and 20 microjoules respectively. AMETEK active probes are designed for internal tank mounting using quick-release clamps. The design of the probes is highly flexible, allowing AMETEK to produce custom designs using standard parts and proven materials. Probes can also be furnished with integral flanges for external mounting. Crashworthy probes are available with load spreading caps or frangible design. Signal conditioners process the probe signals and produce analog or digital outputs (ARINC 429, RS232). They perform the following functions: - Tank profiling - Fuel type compensation - Digital filtering to suppress sloshing - Attitude compensation - Low level detection - Pump and valve control - Built-in-test and system monitoring Signal conditioner software is modular, so it can be tailored for a specific application with a minimum of new code. Software is developed and verified in accordance with RTCA DO-178B. Standard signal conditioner designs are available for installation in pressurized or unpressurized locations SYSTEM DESIGN FEATURES - Robust signal - Self shielding grounded probe - All components factory-calibrated - Current, voltage and energy are limited FEATURES S Does not require shielded wiring ✓ Probes are not affected by nearby structure S Long term accuracy S Plug-and-play system -no aircraft calibration S Intrinsically safe -facilitates compliance with SFAR 88 S Easy to maintain - built-in-test identifies faults AMETEK* AEROSPACE

Fuel Gauging Systems SPECIFICATIONS Probe Signal: 0.5 to 5 mA or V Operating Temperature: -67O to 158OF (-55O to 70OC) System Accuracy: +0, -1% at empty; +2% at full scale Probe MTBF: 250,000 hours Weight: 0.28 + 0.022 lbs/inch (probes); 1.7 lbs (signal conditioner) Stored Energy: <20pJ Fuel Conductivity: up to 1 x 10-6 Siemens/m MAXIMUM GAUGING LEVEL - ELECTRICAL CONNECTOR PER MIL-C-26482, SERIES II MS3440H8C33P DIMENSIONS COMPLETE SYSTEM CAPABILITY AMETEK supplies systems for all fuel measurement and control functions. We perform tank studies, starting from customer-supplied CAD files...