MEMS vibration sensor AKF398

capacitivefor machine monitoringfor machine condition monitoring

Product overview
The AKF398 is a triaxial MEMS vibration sensor with analog current output (4–20 mA) designed for vibration testing, impact measurement and continuous field monitoring. The sensing element is a single-crystal silicon capacitive MEMS die integrated with a low-power ASIC for signal conditioning, a microcontroller storing compensation values and an onboard temperature sensor. The electronics include solid-state reset power and comprehensive over-voltage protection.

Key performance highlights

• Measurement axes: X, Y, Z (triaxial)
• Output: 4–20 mA current loop
• Supply voltage: 9–36 VDC
• Shock resistance: specified 100 g @ 11 ms (3 axial, half-sinusoid); product-level capability up to 2000 g (test dependent)
• Operating temperature: -40 °C to +85 °C; Storage: -40 °C to +85 °C
• Ingress protection: IP67; Connector: industrial M12

Scope of application

• Road roller and compaction equipment monitoring
• Bridge structural monitoring and inspection
• Traffic infrastructure, roadbed analysis and high-speed rail fault detection
• Vibration and impact testing in R&D and production environments

Technical parameters (excerpt)

• Model: AKF398
• Sensor type: single-crystal silicon capacitive MEMS
• Measurement ranges: ±2 / ±4 / ±8 / ±10 / ±20 / ±40 g
• Typical sensitivity (mA/g): 4 / 2 / 1 / 0.8 / 0.4 / 0.2 (±10%)
• Offset/deviation calibration: <1 mg (listed ranges)
• Resolution / threshold (@1 Hz): <1 mg
• Nonlinearity: typically <0.5%–1% FS (range dependent)
• Frequency response: flat to 500 Hz; bandwidth (3 dB) up to 1000 Hz
• Resonant frequency: ≈2.4 kHz (lower ranges) or ≈5.5 kHz (higher ranges)
• Noise density: e.g. 21 μg/√Hz or 86.6 μg/√Hz depending on range
• 0 g output (~12 mA) offset: <0.005 mA or <0.003 mA depending on range
• Vibration survival: 20 g RMS, 20–2000 Hz, per axis for 30 min
• Shock recovery time: <1 ms (example: 1000 g, 1/2 sin 1 ms)
• Running current: <60 mA @ 12 VDC
• Input (VDD–VSS): 9–36 VDC
• Connector: industrial standard M12
• Ingress protection: IP67
• Weight: product net 82 g (accessories listed separately)
• Dimensions: product 34.3 × 34.3 × 38.5 mm (additional shell/adapter/base dimensions available)
• Reliability target: MIL-HDBK-217, grade 2