CME, a division of Aerospace Control Products

United States

Aerospace Control Products, Inc. gage pressure switches have been used in a wide variety of applications for over 45 years. This experienced product group includes over twenty five variations of the basic design. A long service record exists for these units in the aerospace industry. Although these units were first used for an engine mounted auto-feather system, they have since been used in other situations where a rugged andor flame qualified unit was called for. Current applications include use on several propeller, turboprop, and turbine airplanes and helicopters. They are used for pressure sensing in oil, fuel, and bleed air systems.The design incorporates a laser-welded diaphragmpressure platebase assembly, a spring lever actuator, and a snap action switch (Microswitch ). The lever moves away from the switch on increasing pressure and thus protects the snap action switch from overpressure damage. The pressure plate is contoured to stop the diaphragm from excessive movement at maximum pressure, preventing over-pressure from deforming the diaphragm, thus ensuring long term stability. The snap action switch and leverspring are protected by a stainless steel cover. The connectorlead wires are mounted to the cover. A box mount connector is used to resist heat, vibration, and physical abuse. Both the cover and the connector are attached with screws rather than pins or rivets for added strength. These screws are locked by means of locking nuts (connector) or safety wire (cover).

Aerospace Control Products, Inc. barometric pressure switches have been in service for over 45 years. This experienced product group includes over eighty (80) variations of the basic design, and they are used in a wide variety of applications.A long service record exists on these units in airline, in business jet, and in other unique commercial and military applications. These units incorporate a sensitive aneroid capsule which responds to changes in absolute pressurealtitude. When pressure decreases (altitude increases), the capsule expands. This movement is transferred to a snap-action switch, which actuates the device to which it is connected. When pressure increases (altitude decreases), the capsule contracts, and the unit resets.

(Click Each Image to Enlarge) Differential Pressure SwitchAerospace Control Products, Inc. differential pressure switches feature a sensitive elastomeric diaphragm for precise sensing of small pressure changes. Typical applications include airspeed switches, and to sense fuel filter blockage.Options consist of the pressure setting, electrical current carrying capacity, port configurations, mounting method, electrical connections, and electrical connector type.There are several basic model families, configurable to the application:

(Click Each Image to Enlarge) GPP1250-Type Switch GPP1400-Type SwitchAerospace Control Products, Inc. hydraulic pressure switches have been in service for over thirty years.They are used in a wide variety of extreme environment applications in the aerospace and other industries, including: business jets, helicopters, military launch vehicles, submarines, light aircraft amphibious floats, and in airline service.ACPI hydraulic pressure switches incorporate a fluid actuated piston which exerts system hydraulic force against a series of disc springs. This movement is transferred via a plunger mechanism to a springlever device. The springlever transfers this movement to the snap-action switch. The springlever also protects the snap-action switch from damage due to sudden over-pressure spikes. Various devices and techniques are used to produce the proper amount of minimum and maximum travel of the mechanism. These travel limits, along with the spring lever, serve to protect the snap-action switch (Microswitch ) from over-travel and other damage caused by pressure spikes and surges. The piston type unit is inherently resistant to pump ripple and other forms of repetitive pressure changes that typically cause problems for other types of designs.