MEMS vibration sensor GKM392

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Product introduction
The GKM392 is a triaxial MEMS digital vibration (accelerometer) sensor developed by RUICOM Technology for vibration and impact testing applications. It provides selectable digital outputs (RS232 / RS485 / TTL) and supports address-coded daisy-chaining of multiple sensors for long-distance multi-point synchronous measurement and centralized data collection. Core elements include a single‑crystal silicon capacitive sensing chip, a low-power ASIC signal-conditioning circuit, a microprocessor storing compensation data, and an integrated temperature sensor. The unit is factory-calibrated and designed for stable scaling factor and long-term measurement stability.

Key features

• Selectable digital output: RS232 / RS485 / TTL
• Triaxial vibration measurement: 10–2000 Hz; selectable measurement ranges (±2 g to ±40 g)
• Shock resistance: 100 g @ 11 ms (half-sine)
• Addressable multi-sensor daisy-chain for synchronous multi-point acquisition
• Serial protocol and MODBUS RTU support
• Wide supply range: 9–36 VDC; operating current <60 mA @ 12 VDC
• Protection class IP67; product body in aerospace aluminum; magnetic stainless-steel base

Technical summary

• Model: GKM392
• Measurement ranges: ±2 g; ±4 g; ±8 g; ±10 g; ±20 g; ±40 g
• Measurement axis: X, Y, Z (triaxial)
• Bias calibration: <1 mg (all ranges)
• Upward / power-off repeatability: <2 mg (max)
• Bias temperature coefficient: 0.01 %/°C (typical)
• Resolution / threshold (@1 Hz): <1 mg (max)
• Nonlinearity: <1 % FS (max)
• Bandwidth (3 dB): 500 Hz
• Cross-axis sensitivity: 1% (lower ranges) up to 2% (higher ranges)
• Lateral vibration sensitivity ratio: 1%–5% 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)
• Output rate (68 protocol): 5, 10, 25, 50, 100, 200, 500, 1000 Hz
• Output rate (MODBUS): 10, 25, 50 Hz
• Output interface: RS232 / TTL / RS485
• Communication protocols: Serial protocol; MODBUS RTU
• Supply (VDD_VSS): 9–36 VDC
• Operating current: <60 mA @ 12 VDC
• Protection class: IP67
• Materials: product body aerospace aluminum; magnetic base stainless steel
• Weight: product ≤ 116 g; magnetic base ≤ 50 g
• Dimensions: product L36 × W32 × H24 mm; magnetic base L36 × W32 × H8.1 mm
• Note: Do not operate continuously beyond specified ranges.