3-axis accelerometer AKM390

capacitiveMEMSanalog

Product description
The AKM390 three-axis MEMS capacitive vibration sensor provides an analog voltage output (0–5 V) for industrial vibration and impact measurement. It integrates a single‑crystal silicon MEMS sensor element, a low‑power ASIC for signal conditioning, a microcontroller for compensation values and a temperature sensor. The module is factory calibrated, designed for low power consumption and stable long‑term output. Electronic architecture includes solid‑state reset power and overvoltage protection. The IP67 aerospace‑aluminum housing and compact size suit on‑site monitoring and portable test systems.

Key features (summary)

• Three measurement axes: X, Y, Z
• Analog output voltage: 0–5 V
• Supply voltage: 9–36 VDC
• Shock capability (range dependent): up to 2000 g (see parameters)
• Operating temperature: -40 ℃ to +85 ℃
• Protection rating: IP67
• Low power consumption, calibrated output and high stability

Scope of application

• Crash recording, fatigue monitoring and prediction
• Wind turbine condition monitoring
• Transport infrastructure monitoring: subgrade analysis, high‑speed rail fault detection
• Large machinery and engine vibration monitoring
• Low‑frequency vibration and automatic monitoring systems
• Medical equipment monitoring
• Bridge structural monitoring
• Automotive testing and on‑vehicle measurement
• Roller and industrial roller monitoring

Parameters
Model: AKM390 — three‑axis MEMS capacitive accelerometer
Measurement ranges: ±2, ±4, ±8, ±10, ±20, ±40 g
Bias calibration: <1 mg (for listed ranges)
Measurement axes: X, Y, Z
Power on/off repeatability: <2 mg (max)
Sensitivity (±10%): 1250, 625, 312.5, 250, 125, 62.5 mV/g (corresponding to ranges above)
Temperature coefficient of bias: typically 0.01%/℃ (some ranges up to 0.05%/℃)
Resolution/threshold (@1 Hz): <1 mg (max)
Nonlinearity: <0.5% to <1% FS (range dependent)
Response frequency: 500 Hz (typical)
Bandwidth (3 dB): 1000 Hz
Cross‑axis sensitivity: 1%–2% (range dependent)
Lateral vibration sensitivity ratio: 1%–5% (range dependent)
Resonant frequency: 2.4 kHz or 5.5 kHz (range dependent)
Noise density: 21 or 86.6 μg/√Hz (range dependent)
0 g output (offset): 2.5 V (offset variation varies by range)
Output voltage range: 0–5 V
Reliability: MIL‑HDBK‑217, Class II
Impact resistance (spec): 100 g @ 11 ms, triaxial (half‑sine)
Recovery time: <1 ms (1000 g, 1/2 sin 1 ms impact on i‑axis)
Vibration tolerance: 20 g RMS, 20–2000 Hz (random), 30 min per axis
Input (VDD − VSS): 9–36 VDC
Operating current: <60 mA @ 12 VDC
Protection: IP67
Material: aerospace aluminum
Weight: sensor ≤ 116 g; magnetic base ≤ 50 g
Size: sensor L36 × W32 × H24 mm; magnetic base L36 × W32 × H7 mm

Technical specifications

• Model: AKM390 (three‑axis MEMS capacitive accelerometer)
• Output type: Analog voltage 0–5 V
• Supply voltage: 9–36 VDC
• Operating current: <60 mA @12 VDC
• Measurement axes: X, Y, Z
• Measurement ranges: ±2, ±4, ±8, ±10, ±20, ±40 g
• Sensitivity examples: 1250 to 62.5 mV/g depending on range
• Frequency response: up to 500 Hz (response), bandwidth up to 1000 Hz
• Protection rating: IP67
• Material: aerospace aluminum
• Operating temperature: -40 ℃ to +85 ℃
• Size: L36 × W32 × H24 mm
• Weight: ≤116 g (sensor)
• Shock resistance: 100 g @11 ms; recovery time <1 ms