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Chip Detectors |
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Metal particles in the
lubrication system of an aircraft engine or hydraulic system may
be an indication of wear. Chip detectors are used to monitor these
systems to provide early warning of impending failure so that
maintenance can be performed on a timely basis. The detector
houses magnets incorporated into an electric circuit. Magnetic
lines of force attract ferrous particles. Collection of these
particles continues until the insulated air gap between the
magnets (two magnet configuration) or between the magnet and
housing (one magnet configuration) is bridged, effectively closing
the circuit. The result is an electronic signal for remote
indication.
Chip detectors may be positioned in the application with a
self-closing valve/adapter through either a bayonet or threaded
interface. As the chip detector is disengaged from the valve, the
valve closes minimizing any fluid loss from the system.
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Self Closing
Valves |
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Self closing valves offer a practical, economical solution to fluid loss problems in applications
requiring more frequent inspection of magnetic plugs or chip detectors. Available in threaded or bayonet designs, the valves close down automatically
as the magnetic plug or chip detector is removed. This eliminates the loss of expensive lubricants and reduces the need for clean up after inspection. As a
result, inspection is faster and more convenient for maintenance personnel.
Both types of self closing valves offer maximum exposure of the magnet to the flow of lubricant or hydraulic fluid. The wide open design is essential
to proper functioning. If free flow is restricted, ferrous chips and particles are less likely to come is contact with the magnet.
Self closing valves are sealed with "O" rings, providing a positive seal under the low pressure condition generally associated with their application.
The "O" rings seal the valve with the plug in position and when it is removed for inspection.
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Threaded
Self-Closing
valve shown here with
magnetic plug fully installed |
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Bayonet
Self-Closing
valve shown here with
Chip Detector fully installed |
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Strainers |
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Allen Aircraft supplies a full range of screens with or without chip
detectors. The screens are provided in either aluminum or stainless steel
material. The screens are sintered, resistance welded or brazed. The screens
in a forced flow oil lubrication systems come in various screen openings.
Wear debris particles that are larger than the screen openings are retained
by the screen. When a screen assembly is equipped with a integral electronic
chip detector, the debris is attracted to the chip detector and
electronically shows an indication. Many screen assemblies with integral
chip detectors are also provided with a self closing valve. The self closing
valve permits quick removal of the chip detector for inspection without the
need to drain the oil system.
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Allen Aircraft
Products, Inc. ● PO Box 1211 ● 6168 Woodbine Avenue, Ravenna, Ohio 44266 ● (330) 296-9621 ● Fax (330) 296-5532 |
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