ACES Systems 69-100-0064 – 991V Vibration Velocity Sensor

The 991V vibration velocity sensor is used in aircraft vibration and balancing systems to measure velocity (in/sec or similar) rather than acceleration. It connects to analyzers to give technicians velocity-based vibration data needed for dynamic balancing and vibration diagnostics.

The 991V comes with a MIL-C-26482 style 4-pin connector, matching common aviation sensor standard interfaces. This ensures compatibility with standard vibration analyzer cables and minimizes signal loss in harsh environments.

The 991V is rated for a wide operational temperature range of -58°F to 248°F (-50°C to 120°C), making it suitable for extreme ambient conditions. It also supports shock loads up to 1,000 g peak and vibration levels up to 250 g peak (depending on frequency).

While ACES Systems has not specified a rigid calibration schedule, its general guidance recommends annual calibration or recertification whenever the sensor is dropped, damaged, or suspected of being faulty. This practice helps maintain measurement integrity for sensitive vibration and balancing operations.

To preserve signal quality, the 991V should be kept clean, free of debris, and protected from mechanical shock or stress. Its connector pins must be kept aligned and free from corrosion. Periodic inspection for physical damage or loosening is prudent, especially after field use.

Yes. The 991V is explicitly listed as a qualified sensor in ACES Systems’ recalibration policy for use with ACES analyzers and kits. This ensures seamless integration into ACES systems for vibration measurement and balancing tasks.

The 991V sensor has been assigned NSN 6635-01-411-1954, meaning it is recognized in military logistical systems under that number. This helps maintenance planners and procurement teams ensure compatibility across systems.