The GKP3 is a triaxial vibration sensor independently developed for low-frequency vibration monitoring, featuring high precision and low noise. Each product undergoes calibration and compensation across the entire temperature range and approximately 336 hours of long-term stability testing before leaving the factory, ensuring stable performance under diverse operating conditions and continuous testing cycles. The sensor supports static vibration measurement in the 0 Hz or 0.1–100 Hz frequency bands and integrates two output protocols, including the industry-standard MODBUS protocol. The accompanying computer analysis software enables real-time display, recording, and subsequent processing of measurement data. Output interfaces include RS485, RS232, and TTL options. The sensor employs a non-contact installation design, facilitating system integration. Users simply need to fix it to the surface of the object being measured with screws to automatically obtain the object's horizontal angle, making operation simple. The product possesses excellent resistance to external electromagnetic interference and shock vibration, making it suitable for applications such as satellite communication systems, vehicle handling platforms, special command vehicles, and radar antenna vehicles.
Technical Characteristics
❖ Triaxial MEMS vibration sensor;
❖ Resolution 1µg;
❖ Measurement range ±2g;
❖ Output options: RS485, RS232, TTL;
❖ IP67 protection rating.
Application Field
❖ Low-frequency vibration monitoring of ground building structures
❖ Vibration measurement of large rotating equipment such as hydro-generator units
❖ Minor vibration measurement of vibration isolation platforms, etc.
❖ Ultra-low frequency amplitude measurement of highly flexible structures such as suspension bridges
Performance Parameters
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GKP3
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Parameter
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Unit
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Measurement Range
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±2
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g
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Bias Calibration
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<1
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mg
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Measurement Axis
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X,Y,Z
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Axis
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Upward/Power-Off Repeatability
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<2
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mg(Maximum Value)
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Bias Temperature Coefficient
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0.15
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mg/℃(Typical Value)
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Resolution
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1
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ug
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Nonlinearity
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<1
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% FS(Maximum Value)
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Bandwidth (3dB)
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0.1~100
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Hz
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Cross-Axis Sensitivity
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1
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%
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Transverse Vibration Sensitivity Ratio
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1
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%
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Noise Density
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21
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μg/√Hz
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Resonant Frequency
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2.4
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kHz
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Acceleration Power-On Settling Time
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1S
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Output Rate
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5Hz,10Hz,25Hz,35Hz,50Hz,100Hz,200Hz,500Hz
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Output Interface
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RS232/TTL/S485
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Communication Protocol
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Serial communication protocol and MODBUS RTU protocol
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Input (VDD_VSS)
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9~36 VDC
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Operating Current Consumption
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<16mA @ 12 VDC
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Waying Information
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2-meter PVC black shielded aviation cable, weight ≤130g
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Connectors
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Aircraft connector M12*1.0 male 5-core
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Product Weight
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≤450g(excluding cable)
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Note: Do not use beyond the specified range for extended periods.
PIN Definition
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PIN/Thread Color
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Definition
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PIN1/Brown
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DC9 ~36V
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PIN2/White
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RS232/TTL_RXD / RS485_D+
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PIN3/Blue
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RS232/TTL_TXD / RS485_D-
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PIN4/Black
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GND
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PIN 5/Gray
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Signal Ground
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Interface Connection Instructions
1. Select cables that conform to RS-485/RS-232 standards, ensuring the cable quality and performance meet the requirements. Twisted-pair cable is recommended due to its better anti-interference capability.
2. At both terminal devices in the RS-485/RS-232 communication network, terminating resistors (typically 120 ohms) need to be connected to eliminate signal reflections. Avoid connecting terminating resistors on intermediate devices to prevent signal interference.
3. To ensure system stability and security, the RS-485/RS-232 communication network needs to be grounded. The signal ground wire should be connected to the grounding terminal of each device.
Installation Orientation
During installation, the sensor mounting surface should be kept parallel to the surface of the target object to minimize the impact of dynamics and acceleration on the sensor. This product can be installed horizontally or vertically; please refer to the diagram below for installation instructions:
Product Dimensions
Housing dimensions: L93×W70×H41mm
Mounting dimensions: L71×W56×H8mm
Recommended screws: 4 M6 screws
Product Tags:
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GKP3 Low Frequency Vibration Sensor RS232 / TTL / S485 Output Interface Images
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