American Aerospace Controls' DO-160E qualified Model S1028 Series AC Current Level Detectors have been recently specified for aftermarket use on the Boeing 747 by several major European carriers, in direct support of aircraft galley water heater upgrade requirements.
Within the Boeing 747 aircraft galley are two separate water heaters, each with its own unique power requirements, supplied by a common busbar. To prevent overloads caused by simultaneous operation of both water heaters, the AAC S1028 AC Current Level Detector is used to prioritize operation by the higher-load water heater, effectively locking out the second water heater while the first is in use.
Customer-Selected Trip Point
The AAC S1028 Series AC Current Level Detector specified for this application has an operating range from 0 to 250 A ac, a frequency range of 360 to 650 Hz, and operates from a 28 Vdc nominal supply voltage. The detector provides an SPST output relay for currents at or above trip point and customers can select the desired trip point in 1 A increments from 1-250 A ac, depending on the product number.
The Series design builds upon the success of the company's model S979 Series, adding an enlarged aperture from 0.50 to 1 in. in diameter, with model variation flexibility to support different trip points. Both sensors are qualified to the same DO-160E environmental specification for temperature and altitude, temperature variations, humidity, shock and crash safety; are explosion-proof, waterproof, sand and dust and mold resistant; are designed with capability to withstand salt fog and icing conditions and fire flammability; and are immune to electromagnetic effects, extraneous power inputs, power or voltage spikes, lighting induced transients, and electrostatic discharge. Units are also audio frequency conducted, and feature induced RF signal susceptibility, RF susceptibility and emission.
American Aerospace Controls has been supporting Boeing aircraft aftermarket current measurement requirements for more than four decades. Earlier this year, The Boeing Company honored AAC for its product quality, reliability and on-time delivery with a third consecutive annual Performance Excellence Award.
