Capacitive vibration sensor AKM392

micromechanicalMEMSfor medical applications

Product description
AKM392 is a triaxial MEMS digital vibration sensor for vibration and shock testing. It integrates a micromachined monocrystalline silicon capacitive sensing chip, a low-power signal-conditioning ASIC, a microprocessor for compensation storage and a temperature sensor. Digital outputs include RS232, RS485 and TTL; each sensor can be assigned an address for long-distance multi-point serial connection and centralized data analysis. The sensor offers low power consumption, mechanically robust construction, calibrated stable output, solid-state over-current protection and long-term scale factor stability typically <0.1% FS.

Key features

• Triaxial measurement (X, Y, Z)
• Output: RS232 / RS485 / TTL; protocols: RION 68, MODBUS RTU
• Selectable ranges: ±2 / ±4 / ±8 / ±10 / ±20 / ±40 g
• Bandwidth: 500 Hz (3 dB)
• Shock rating: up to 2000 g; impact test: 100 g @ 11 ms (triaxial)
• Operating temperature: -40°C to +85°C; protection: IP67
• Supply voltage: 9–36 VDC; operating current <60 mA @ 12 VDC
• Material: aerospace aluminium; sensor weight ≤116 g

Scope of application

• Crash recording, fatigue monitoring and prediction
• Wind power turbine monitoring
• Traffic system monitoring and high-speed railway fault detection
• Large machinery and engine vibration monitoring
• Low-frequency vibration and automatic monitoring
• Medical equipment vibration measurement
• Bridge structural monitoring
• Automotive testing
• Roller and rolling mill applications

Parameters

• Measure ranges: ±2, ±4, ±8, ±10, ±20, ±40 g
• Deviation calibration: <1 mg (all ranges)
• Resolution / threshold (@1 Hz): <1 mg (max)
• Nonlinearity: <0.5% to <1% FS (depending on range)
• Noise density: 21 μg/√Hz (lower ranges) or 86.6 μg/√Hz (higher ranges)
• Resonant frequency: 2.4 kHz (lower ranges) or 5.5 kHz (higher ranges)
• Cross-axis sensitivity: 1–2% (typical)
• Transverse vibration sensitivity ratio: 1–5% (typical)
• Automatic output rates (RION 68): 5, 10, 25, 50, 100, 200, 500, 1000 Hz
• MODBUS automatic output rates: 10, 25, 50 Hz
• Reliability: MIL-HDBK-217, Class II
• Recovery time: <1 ms (1000 g, 1/2 sin 1 ms)

Dimensions

• Sensor size: L36 × W32 × H24 mm
• Installation size: L29 × W25 × H4 mm
• Magnetic base plate: L36 × W32 × H7 mm
• Mounting screws: 4 × M4

Technical specifications

• Model: AKM392
• Output interfaces: RS232, RS485, TTL
• Communication protocols: RION 68, MODBUS RTU
• Supply voltage: 9–36 VDC
• Operating current: <60 mA @ 12 VDC
• Protection: IP67
• Material: aerospace aluminium (sensor); magnetic base: stainless steel
• Weight: sensor ≤116 g; magnetic base ≤50 g
• Operating temperature: -40°C to +85°C; storage temperature: -40°C to +85°C