MV-25B-V

Function of MV-25B-V in vibration monitoring

The main function of MV-25B-V is continuous measurement of low-frequency vibration parameters from aircraft engines, gearboxes, auxiliary power units or airframe structures, depending on installation. The sensor generates an electrical signal that is processed by vibration monitoring equipment such as IV-200, IV-41, IV-500 or similar systems. These systems use the signal to assess vibration severity, identify exceedances and support early detection of rotor imbalance, bearing defects or other mechanical faults in rotating assemblies.

Inductive operating principle of MV-25B-V

MV-25B-V is described as an electromechanical / magnetoelectric inductive vibration transducer. Inside the housing, a coil and moving inertial mass with a permanent magnet are arranged on centering springs. When the monitored structure vibrates, relative movement inside the sensor generates an AC electrical signal. The amplitude and frequency of this signal are proportional to the vibration parameters. This operating principle makes the sensor suitable for low-frequency vibration measurement on aircraft gas turbine engines and related equipment.

Installation on Il-76 and D-30KP engines

According to the supplied context, MV-25B-V sensors are installed directly on the housings of D-30KP turbojet engines used on Il-76 aircraft. Two sensors may be installed on each main engine: one in the compressor support area and one in the turbine support area. This arrangement allows monitoring of vibration from both front and rear rotor support zones. For a four-engine Il-76 configuration, the source context mentions eight MV-25B-V sensors in total, depending on aircraft and system documentation.

Associated onboard equipment

The MV-25B-V sensor forms part of a complete measurement chain. Signals from the engine-mounted sensors are routed through aircraft wiring to electronic processing units such as BE-6-6, which amplify and filter the sensor output. The processed information is then displayed in the cockpit on a vibration indicator such as UK-68V. When vibration exceeds allowable limits, warning indication may be provided to the crew. Exact equipment composition, wiring route and threshold logic must be confirmed by the applicable aircraft documentation.

Identification and ordering of MV-25B-V

Before ordering MV-25B-V, the buyer should confirm the aircraft type, engine type, vibration monitoring system, required quantity, connector version, mounting type and documentation requirements. It is also important to distinguish MV-25B-V from related MV-series sensors, including MV-26B-V. The sensor may be required for engine vibration monitoring repair, replacement of a defective transducer, scheduled maintenance stock or support of Il-76 / D-30KP operation. Product passport, inspection records and calibration / test documentation should be agreed before shipment.