Murata has introduced the PKGM-210D-R, an SMD vibration sensor device optimized for predictive maintenance and condition monitoring in industrial equipment.
The device can detect high-frequency vibration components up to 20 kHz, enabling earlier detection of bearing, motor and mechanical issues that are often missed by conventional low-frequency sensors. Its compact footprint and integrated signal conditioning are designed to simplify design-in and retrofit on existing machinery.
Key features and benefits
The Murata PKGM-210D-R is a single-axis piezoelectric ceramic vibration sensor with integrated analog signal conditioning and temperature sensing. It is intended as a robust, board-mountable building block for condition-based monitoring systems in factory automation and related fields.
Key features:
- Z-axis vibration detection with a frequency bandwidth from 5 kHz to 20 kHz
- Compact SMD package of 0.20 × 0.20 × 0.14 inches (5.0 × 5.0 × 3.5 mm) for PCB mounting
- Built-in driver and filter circuits, reducing external analog front-end complexity
- Single-ended analog output, simplifying connection to ADCs or monitoring ICs
- Integrated temperature sensor for additional diagnostic and compensation functions
- Supply voltage range of 3.0 V to 5.2 V, supporting common industrial and embedded power rails
- Typical G sensitivity of 44 mV/G, with a minimum detection range of ±10.2 G and a typical range of ±50 G
- Operating temperature range from −20∘C-20^\circ\text{C} to 85∘C85^\circ\text{C}, suitable for many industrial environments
From a system perspective, the integrated filter and driver stages can reduce BOM count, PCB area and analog design effort compared with raw piezo elements or sensors requiring external charge amplifiers.
Typical applications
Murata positions the PKGM-210D-R primarily for predictive maintenance and condition-based monitoring in factory automation. The high-frequency bandwidth allows the device to capture early-stage fault signatures that often reside above the range used for simple vibration level monitoring.
Typical application areas include:
- Bearings and rotating machinery health monitoring in motors, pumps, compressors and gearboxes
- Detection of abnormal vibration patterns from insufficient lubrication, misalignment or early mechanical wear
- Integration into smart motors, actuators or mechatronic modules for built-in condition monitoring
- Retrofit sensor nodes on existing production equipment where compact SMD devices can be added to local control boards or small sensor PCBs
- Industrial IoT (IIoT) vibration monitoring nodes feeding data to gateways or cloud-based analytics platforms
Because the sensor focuses on the Z-axis and the 5 kHz to 20 kHz band, it complements lower-frequency accelerometers often used for overall vibration trend monitoring, allowing multi-band analysis in more advanced monitoring architectures.
Technical highlights
The PKGM-210D-R combines Murata’s piezoelectric ceramic vibration detection technology with an integrated analog interface in a small SMD package.
Key technical data (according to manufacturer specifications):
- Product name: PKGM-210D-R
- Package size: 5.0 mm (L) × 5.0 mm (W) × 3.5 mm (T)
- Detection axis: 1 axis (Z direction)
- Frequency bandwidth: 5 kHz to 20 kHz
- Detection G range (minimum): ±10.2 G, typical ±50 G
- G sensitivity (typical): 44 mV/G
- Supply voltage: 3.0 V to 5.2 V
- Current consumption: 3.0 mA
- Output type: single analog output
- Operating temperature range: −20∘C-20^\circ\text{C} to 85∘C85^\circ\text{C}
In practice, a sensitivity of 44 mV/G means that a vibration of 10 G will produce an output swing of approximately 0.44 V0.44\ \text{V}, which is directly usable by most microcontroller or data-acquisition ADC inputs when combined with appropriate offset and scaling. Engineers should refer to the manufacturer datasheet for detailed transfer characteristics, recommended output loading and calibration information.
The integrated temperature sensor adds another diagnostic dimension: it can support temperature-based derating strategies, correlation of vibration signatures with thermal conditions, or compensation for temperature drift of the vibration measurement chain.
Design‑in notes for engineers
When designing in the PKGM-210D-R, several practical aspects are worth considering:
- Mechanical placement and orientation: The device senses vibration along the Z-axis, so PCB placement, board mounting and mechanical coupling to the monitored structure are critical for capturing relevant vibration signatures. Placing the sensor close to the mechanical component of interest and ensuring a rigid mechanical path typically improves signal fidelity.
- Frequency focus: With a 5 kHz to 20 kHz bandwidth, the sensor targets higher-frequency vibration components that often precede major failures. This makes it suitable for early fault detection algorithms but less suited as a general-purpose low-frequency accelerometer. Combining it with a broadband accelerometer can give a more complete picture of machinery health.
- Signal chain and ADC interface: Thanks to the built-in driver and filter circuits, the analog output can usually be routed directly to a microcontroller or data-acquisition ADC, subject to the recommended load and input impedance given in the datasheet. Engineers should verify required anti-aliasing, offset and scaling in the context of their sampling rate and ADC input range.
- Power budget and supply: The typical current consumption of 3.0 mA is modest for continuously powered industrial nodes but may be notable in battery-powered wireless sensors. Power-cycling or duty-cycling strategies, where compatible with the monitoring requirements, can help manage energy usage.
- Temperature considerations: The operating range of −20∘C-20^\circ\text{C} to 85∘C85^\circ\text{C} covers many industrial indoor and enclosure-based applications. For harsher environments or outdoor installations, system-level thermal management and environmental protection must be considered, and the temperature sensor output can be used for additional monitoring or compensation.
- Noise and cabling: In PCB-level integration, the single-ended analog output can be sufficient, especially when traces are short and routed carefully with proper grounding. For longer runs or noisy environments, Murata’s differential output variant PKGM-200D-R may be a better fit, as differential signaling improves immunity to common-mode noise.
From a purchasing and lifecycle perspective, having both a single-ended and a differential version in the same product family can simplify platform design, allowing reuse of mechanical and digital processing while tailoring the analog interface to each use case according to the manufacturer datasheet.
Source
This article is based on information provided in the official Murata Manufacturing Co., Ltd. press release and related product pages, complemented with general engineering interpretation for vibration-based predictive maintenance applications.