MEMS vibration sensor AKM398

electronicfor wind turbinefor medical applications

Product overview
The AKM398 is a three-axis MEMS vibration sensor designed for industrial vibration and impact measurement. The sensor integrates a single-crystal silicon capacitive MEMS chip, a low-power ASIC for signal conditioning, a microcontroller storing calibration/compensation data and an integrated temperature sensor. The device provides analog current output (4–20 mA), factory calibration, solid-state power reset and over-voltage protection to ensure stable, reliable signals in demanding environments.

Key features

• Triaxial measurement (X, Y, Z)
• Analog current output: 4–20 mA
• Supply voltage: 9–36 VDC
• High shock/impact resistance with fast recovery
• Low operating current (<60 mA @ 12 VDC)
• Ingress protection: IP67
• Aerospace-grade aluminum housing
• Factory calibrated with stable zero and sensitivity

Applications

• Crash recording, fatigue monitoring and life prediction
• Wind-turbine condition monitoring
• Rail and traffic infrastructure monitoring, subgrade analysis, high-speed train fault detection
• Large rotating machinery and engines
• Low-frequency vibration monitoring and automatic condition monitoring
• Medical device vibration monitoring
• Bridge and structural health monitoring
• Automotive testing and qualification
• Roller and rotating equipment surveillance

Technical parameters
AKM398 — PARAMETER — UNIT
Measurement ranges — ±2, ±4, ±8, ±10, ±20, ±40 — g
Deviation calibration — <1 — mg
Measurement axes — X, Y, Z — Axis
Power-on/off repeatability — <2 — mg (max)
Sensitivity (±10%) — 4, 2, 1, 0.8, 0.4, 0.2 — mA/g (by range)
Temperature coefficient of deviation — 0.01 / 0.05 — %/°C (varies by range)
Resolution / Threshold (@1 Hz) — <1 — mg (max)
Nonlinearity — <0.5 / <0.8 / <1 — % FS (max, varies by range)
Response frequency — 500 — Hz
Bandwidth (3 dB) — 1000 — Hz
Cross-axis sensitivity — 1 / 2 — % (depends on range)
Lateral vibration sensitivity ratio — 1 / 2 / 5 — % (depends on range)
Resonant frequency — 2.4 / 5.5 — kHz (depends on range)
Noise density — 21 / 86.6 — μg/√Hz (depends on range)
0 g output (typical) — 12 mA (offset <0.005 ~ <0.003 mA depending on range)
Output current — 4–20 mA
Reliability — MIL-HDBK-217, Class II
Impact resistance — 100 g @ 11 ms, triaxial (half sine)
Recovery time — <1 ms (1000 g, 1/2 sin 1 ms, impact on i-axis)
Environmental vibration tolerance — 20 g RMS, 20–2000 Hz (random noise, 30 min per axis)
Input (VDD - VSS) — 9–36 VDC
Operating current consumption — <60 mA @ 12 VDC
Protection — IP67
Material — Aerospace aluminum housing
Weight — Product net weight ≤116 g; magnetic base ≤50 g
Dimensions — Product: L36 × W32 × H24 mm; Magnetic base: L36 × W32 × H7 mm

Dimensions & mounting

• Housing size: L36 × W32 × H24 mm
• Installation size: L29 × W25 × H4 mm
• Mounting screws: 4 × M4

Characteristics / specifications

• Model: AKM398
• Measurement axes: X, Y, Z (triaxial)
• Available ranges: ±2, ±4, ±8, ±10, ±20, ±40 g
• Output type: 4–20 mA analog
• Typical 0 g output: 12 mA (offset <0.005–0.003 mA by range)
• Sensitivity (typical, ±10%): 4 / 2 / 1 / 0.8 / 0.4 / 0.2 mA/g
• Bandwidth: up to 1000 Hz (3 dB); Response freq: 500 Hz
• Noise density: 21 or 86.6 μg/√Hz (range dependent)
• Nonlinearity and cross-axis sensitivity within specified limits
• Impact resistance and fast recovery for harsh environments
• Operating temperature: -40 °C to +85 °C; Storage: -40 °C to +85 °C
• Power supply: 9–36 VDC; Operating current <60 mA @ 12 VDC
• Protection rating: IP67; Housing material: aerospace-grade aluminum
• Reliability: MIL-HDBK-217, Class II
• Weight and mounting as specified above