Industrial Piezo-Accelerometer for Rotating Machinery Vibration Monitoring

The 87870-01 Velomitor XA Piezo-Accelerometer is an industrial-grade vibration sensor designed for critical rotating machinery monitoring applications. Through precision piezo-electric sensing technology and hermetically sealed construction, it delivers accurate, real-time vibration data for turbines, compressors, pumps, and other high-value assets.

Suitable for power generation plants, petrochemical facilities, manufacturing operations, and process industries where equipment reliability is paramount. This sensor helps solve challenges including undetected bearing degradation, unexpected machinery failures, excessive maintenance costs, and compliance with vibration standards (ISO 10816, API 670).

With rugged stainless steel construction, wide frequency response (2 Hz to 10 kHz), and proven compatibility with major monitoring platforms, the 87870-01 offers reliable performance, straightforward installation, and long service life. Ideal for design engineers, maintenance teams, system integrators, and plant reliability managers. Contact our application engineers for customized selection guidance and technical specifications.

Core Capabilities & Performance Advantages

Precision Vibration Measurement
Piezo-electric sensing element with 100 mV/g nominal sensitivity captures both low-frequency imbalance (2 Hz) and high-frequency bearing defects (up to 10 kHz), providing comprehensive machinery health insight across the entire diagnostic spectrum.

Extreme Environment Durability
Hermetically sealed 316L stainless steel housing withstands temperatures from -40°C to +121°C, resists corrosive atmospheres, and maintains IP67 protection against moisture and contaminants—reducing sensor replacement frequency by up to 60% versus standard industrial accelerometers.

Universal System Compatibility
Standard voltage output (100 mV/g) integrates seamlessly with Bently Nevada 3300/3500 series, Orbit 60 platforms, and third-party vibration analyzers or PLC-based data acquisition systems, eliminating proprietary lock-in and simplifying multi-vendor installations.

Enhanced Signal Integrity
Low-noise design with ground isolation minimizes electrical interference from VFDs, motors, and power systems, ensuring clean diagnostic signals even in electrically noisy industrial environments—critical for accurate fault detection and trending analysis.

Rapid Deployment & Serviceability
Standard 1/4-28 UNF stud mount with 2-pin MIL-C-5015 connector enables quick installation on bearing housings or structural casings. Field-replaceable design reduces downtime during sensor maintenance or upgrades.

Proven Reliability Track Record
Backed by decades of Bently Nevada engineering heritage, this accelerometer delivers 10+ years of drift-free operation under proper installation conditions, minimizing lifecycle costs and supporting long-term asset management strategies.

Typical Application Scenarios

This industrial piezo-accelerometer is engineered for environments demanding continuous vibration monitoring, early fault detection, and regulatory compliance:

Power Generation & Turbomachinery
Monitors steam turbines, gas turbines, and generator bearing housings in utility and cogeneration plants. Detects rotor imbalance, misalignment, and bearing wear before catastrophic failure, supporting condition-based maintenance programs and avoiding forced outages.

Oil & Gas Processing Equipment
Tracks vibration on centrifugal compressors, reciprocating compressors, and high-speed pumps in upstream, midstream, and downstream facilities. Ensures compliance with API 670 machinery protection standards while reducing unplanned shutdowns in critical process units.

Chemical & Petrochemical Rotating Assets
Provides casing vibration data for agitators, mixers, centrifuges, and process pumps handling corrosive or hazardous fluids. Hermetic sealing protects sensor electronics from chemical exposure, extending service intervals in harsh process environments.

Manufacturing & Heavy Industry
Supports predictive maintenance programs for large motors, gearboxes, fans, and blowers in steel mills, paper plants, cement facilities, and automotive manufacturing. Enables transition from time-based to condition-based maintenance, reducing spare parts inventory and labor costs.

Water & Wastewater Infrastructure
Monitors municipal and industrial pump stations, blower systems, and treatment equipment. Early detection of cavitation, bearing faults, and mechanical looseness prevents service interruptions and extends asset life in 24/7 continuous-duty applications.

Technical Parameters & Selection Guide

To facilitate engineering design and sensor selection, we provide comprehensive specifications for the 87870-01 Velomitor XA accelerometer. Custom configurations available for specialized applications.

Selection Recommendations
When specifying the 87870-01 accelerometer, consider: machinery operating speed range (ensure critical frequencies fall within 2-10 kHz bandwidth), mounting surface temperature (verify within -40°C to +121°C limits), environmental conditions (IP67 suitable for most industrial settings), monitoring system input requirements (100 mV/g output compatible with most platforms), and cable routing constraints (recommend 5-15m shielded coaxial cable). For assistance with sensor placement, quantity determination, or system integration, provide machinery type, operating parameters, and monitoring objectives—our application engineers will recommend optimal configuration.

Advanced Integration Capabilities

Multi-Platform Monitoring Ecosystem
Native compatibility with Bently Nevada 3300 XL, 3500 rack-based systems, and Orbit 60 Series platforms. Also integrates with third-party vibration analyzers, portable data collectors, and PLC-based SCADA systems via standard voltage signal interface.

Predictive Analytics & Diagnostics
When paired with System 1 condition monitoring software or equivalent platforms, enables advanced features including FFT spectrum analysis, time-waveform capture, envelope detection for bearing diagnostics, order tracking for variable-speed machinery, and automated alarm management with email/SMS notifications.

Wireless & IIoT Connectivity Options
Can be integrated with wireless vibration transmitters or edge computing gateways for Industrial Internet of Things (IIoT) deployments, supporting remote monitoring, cloud-based analytics, and mobile dashboard access for distributed asset fleets.

Delivery, Service & Quality Assurance

Lead Time & Availability
Standard 87870-01 units typically ship within 3-5 business days from stock. Custom cable lengths or special configurations require 10-15 business days. Expedited shipping available for urgent machinery repairs or project deadlines.

Warranty & Support Coverage
12-month manufacturer warranty covers material defects and workmanship failures. Extended warranty programs available for critical applications. Technical support includes installation guidance, troubleshooting assistance, and application engineering consultation via phone, email, or remote video support.

Documentation & Certification
Each sensor ships with calibration certificate (traceable to NIST/ISO standards), installation manual, dimensional drawings, electrical connection diagrams, and recommended mounting torque specifications. Material test reports and country-of-origin certificates available upon request for compliance documentation.

Installation & Commissioning Services
Optional field services include on-site sensor installation, baseline vibration surveys, monitoring system configuration, and operator training. Regional service coverage available—contact for site-specific service capabilities and pricing.

Frequently Asked Questions

Q: How does the 87870-01 piezo-accelerometer differ from velocity-based vibration sensors?
A: Piezo-accelerometers excel at detecting high-frequency bearing defects, gear mesh issues, and cavitation (typically above 1 kHz), while velocity sensors are optimized for lower-frequency imbalance and misalignment (10-1000 Hz). The 87870-01's wide 2 Hz-10 kHz range provides comprehensive coverage, making it suitable for general-purpose machinery monitoring where both low and high-frequency faults must be detected.

Q: What is the maximum cable length for maintaining signal quality with this accelerometer?
A: Standard installations support cable runs up to 150 meters (500 feet) using low-capacitance coaxial cable (RG-58 or equivalent). For longer distances, use in-line signal conditioners or transmitters to convert the voltage signal to 4-20 mA current loop, which can reliably transmit over 300+ meters without degradation.

Q: Can the 87870-01 be used in hazardous area classifications (Class I Div 1/2 or ATEX zones)?
A: The standard 87870-01 is designed for general industrial use (non-hazardous areas). For explosive atmospheres, it must be used with intrinsically safe (IS) barriers or galvanic isolators certified for the specific hazardous area classification. Consult factory for IS barrier selection or consider ATEX/IECEx certified accelerometer variants if available.

Q: What mounting surface preparation is required for accurate vibration measurement?
A: The mounting surface must be flat, clean, and free of paint, rust, or debris. Surface finish should be 32 microinches Ra or better. Drill and tap a 1/4-28 UNF threaded hole to a depth of at least 6mm (0.25 inches). Apply sensor with 5-7 Nm (45-60 in-lbs) torque using a thin layer of mechanical grease to improve coupling. Avoid mounting on thin sheet metal or flexible structures that may introduce resonance errors.

Q: How often does the 87870-01 require recalibration, and what is the expected drift rate?
A: Under normal operating conditions (within temperature and shock limits), piezo-electric accelerometers exhibit minimal sensitivity drift—typically less than 5% over 5-10 years. Recalibration intervals depend on application criticality and industry standards; most users recalibrate every 2-5 years. For critical safety applications or regulatory compliance, annual calibration verification may be required.

Q: Is this sensor compatible with wireless vibration monitoring systems?
A: Yes, the 87870-01's standard voltage output can interface with wireless vibration transmitters (such as IFM VSE or equivalent) that convert the analog signal to digital format and transmit via industrial wireless protocols (WirelessHART, ISA100, or proprietary RF). This enables retrofit of existing wired sensors into wireless IIoT monitoring architectures without sensor replacement.

Request Technical Support & Quotation

For detailed application engineering, sensor selection assistance, or project quotations, please provide the following information to our technical team:

• Project name and application industry (power generation, oil & gas, manufacturing, etc.)
• Machinery type and operating parameters (equipment type, speed range, bearing configuration)
• Quantity of monitoring points and sensor requirements
• Monitoring system platform (Bently Nevada, third-party, or new installation)
• Environmental conditions (temperature range, hazardous area classification, exposure to chemicals/moisture)
• Installation timeline and delivery location

Our application engineers will provide one-on-one consultation, recommend optimal sensor placement strategies, and deliver competitive pricing with volume discounts for multi-sensor projects.

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