When you compare vibration sensors for industrial asset monitoring, several technical factors come into play.
The decision between wireless and wired vibration sensors directly impacts the reliability of your predictive maintenance program, operational costs and your ability to detect failures early.
Overall, maintenance professionals face a common challenge: identifying which technology best fits their plant’s specific conditions.
Factors such as ambient temperature, equipment accessibility, required collection frequency and available infrastructure should guide this decision.
This article compares vibration sensors across three categories, fixed online sensors (wireless or wired) and portable wireless sensors, offering practical criteria to help you make an informed decision.
The comparison does not include offline wired sensors, since Industry 4.0 demands faster data and agile connectivity for decision-making.
The goal is to help you choose the most current technology and keep your predictive maintenance program truly online and reliable.
Quick Summary: how to compare vibration sensors
- Wireless sensors offer simplified installation and work well in hard-to-reach or higher-risk locations.
- Wired sensors withstand extreme temperatures and ensure stable readings on very low-speed machines.
- Dynamox offers an integrated solution with wireless sensors, wired sensors, gateways and a cloud-based analytics platform.
- Asset criticality determines whether monitoring should be continuous (fixed sensors) or periodic (portable sensors).
- Hybrid strategies combine the best of both approaches, optimizing costs and monitoring coverage.
What are industrial vibration sensors and why compare them?
Industrial vibration sensors are devices that measure the mechanical oscillations of machines and equipment during operation.
They capture variations in parameters such as acceleration, velocity and displacement, which indicate operating conditions and the possible presence of early-stage failures in rotating components.
Comparing sensor types matters because each technology has distinct characteristics.
Wireless, wired and portable sensors meet specific needs around installation, collection frequency and operating environment. Choosing the wrong option can lead to inaccurate data, higher costs or undetected failures.
The goal is to align the technology with your plant’s real conditions, which means evaluating factors like ambient temperature, accessibility of measurement points, asset criticality and existing infrastructure.
What are the main types of vibration sensors available?
The market offers three main categories of vibration monitoring sensors: wireless, wired and portable. Each comes with specific technical advantages that make it better suited to certain applications.
1. Wireless sensors
Wireless sensors are IoT devices that collect vibration and temperature data and transmit it to the cloud through gateways or mobile apps.
They remove the need for cabling infrastructure and enable asset monitoring in hard-to-reach locations.
Dynamox offers triaxial sensors such as the DynaLogger HF+, TcAg and TcAs families, which measure vibration across three axes simultaneously. These devices carry IP66/IP68/IP69K certification and are approved for classified areas with explosion risk (Ex).
2. Wired sensors
Wired sensors transmit data through cables connected to acquisition systems. They’re recommended for environments with extreme temperatures (above 85°C) and for very low-speed machines that require greater reading stability.
The main drawback is the need for electrical infrastructure and cable routing, which raises installation and maintenance costs and limits project scalability.
Dynamox’s wired solution combines uniaxial and triaxial accelerometers, an acquisition system with simultaneous data collection and dedicated software for continuous monitoring. Wired sensors are not available in all countries, talk to one of our specialists to know more.
3. Portable sensors
Portable sensors are used on periodic inspection routes: a technician moves through the equipment, takes the measurements and sends the data for analysis on the Dynamox platform. They suit medium- or low-criticality assets, or assets that run infrequently, where monitoring doesn’t need to be uninterrupted.
Dynamox’s DynaPortable, for example, uses a magnetic base and Bluetooth connection, enabling quick, standardized data collection without cables or heavy carrying cases.
What technical criteria should you evaluate when comparing vibration sensors?
Selecting the right vibration sensor depends on specific technical criteria that vary according to your plant’s conditions. That’s why it’s worth weighing each factor before settling on a technology.
Ambient operating temperature
Ambient and surface temperature directly affects sensor performance.
- Dynamox’s wireless sensors vary by model: the TcAs and TcAg operate from -10°C to 79°C, while the DynaLogger HF+s, in batches manufactured from batch 05 onward, operates from -10°C to 105°C.
- Dynamox’s wired sensors are recommended for more extreme conditions, above 125°C and up to 155°C.
Data collection method
Wired sensors transmit data automatically, via cable, to the receivers. Wireless sensors, on the other hand, rely on a collection system that works in one of two ways:
- Manual: an analyst goes into the field with a smartphone, uses the Dynamox app and retrieves the data stored on the sensors. This approach suits mobile assets, easily accessible low-criticality equipment, or plants with few monitored assets.
- Automatic and remote: DynaGateways, wireless collectors installed within a 100-meter radius of the sensors, gather data automatically. This solution fits plants with many monitored assets, medium- or high-criticality equipment, or assets that are hard to reach or located in hazardous areas.
Either way, every collection method sends data directly to the Dynamox Platform, accessible anytime, anywhere. On the platform, you’ll find trend analysis tools, a criticality matrix and artificial intelligence for fault diagnosis and identification, along with AI agents for deeper analysis.
Required collection frequency
Critical assets or those with a history of recurring failures call for high-frequency monitoring. Fixed sensors (wireless or wired) allow automatic collection at intervals of 1 to 60 minutes, while medium-criticality equipment can be monitored weekly with portable sensors.
Collection frequency directly affects your ability to detect failures early: the higher the frequency, the wider the window to plan interventions before a problem escalates.
Accessibility of the measurement point
Machines installed in elevated, confined or higher-risk locations are natural candidates for fixed wireless sensors. They eliminate the need to send a team out for data collection and reduce exposure to risk.
Easily accessible equipment can be covered through inspection routes with portable sensors, as long as the collection frequency matches the asset’s failure pattern.
Sensor frequency range
The frequency range determines which failure types a sensor can detect. Early-stage bearing failures generate high-frequency signals (above 2.5 kHz), while imbalance and misalignment show up at lower frequencies.
Dynamox’s DynaLoggers, for instance, follow ISO 20816 for vibration severity classification in rotating machines. The DynaLogger HF+ reaches up to 13 kHz, enabling early detection of defects in components such as bearings and gears.
How do wireless and wired vibration sensors compare??
Choosing between wireless and wired sensors involves technical, operational and economic variables. Each technology brings specific advantages that make it a better fit for certain scenarios.
Advantages of Wireless Sensors
Wireless sensors eliminate the cost of cabling infrastructure and electrical points. Installation is simple and can be done with industrial adhesive or a screw, with no structural changes needed on site.
Scalability is another key advantage: you can start monitoring with just a few sensors and expand gradually as your predictive program matures. Gateway communication ensures data is sent automatically to the cloud.
Advantages of Wired Sensors
Wired sensors suit extreme temperature conditions and very low-speed assets. The physical connection ensures stable data transmission and supports acquisition at very low frequencies, closer to continuous, near-instant data collection.
They’re also preferred in environments where wireless connectivity is limited or where regulations restrict wireless transmission devices.
Technical Comparison Between the Technologies
The table below summarizes the main differences between wireless and wired sensors to support your decision.
| Criteria | Wireless Sensors | Wired Sensors |
| Installation | Simplified, no cabling infrastructure | Requires cable routing and an electrical point |
| Operating temperature | Up to 105°C (HF+s); 79°C (TcAs/TcAg) | Recommended above 125°C, up to 155°C |
| Scalability | High, gradual project expansion | Limited by infrastructure cost |
| Very low speeds | Suitable for low speeds | Preferred for very low speeds |
| Operational safety | Reduces technician exposure to risk | Requires access for initial installation |
How do you determine asset criticality to choose the right sensor?
Asset criticality is the main factor in deciding which sensor type to use.
Equipment with greater operational impact justifies a more complete monitoring investment.
Criteria for Classifying Criticality
- Assess the impact of a failure by looking at safety, production, costs and environmental factors.
- Assets that cause line stoppages, safety risks or environmental damage fall into the critical category.
- Other factors include redundancy (a backup unit), failure history and average repair time.
- Machines with no backup and a history of recurring problems deserve priority monitoring.
- As a recommendation, use an ABC criticality matrix to classify your assets.
Correlation between criticality and sensor Type
High-criticality assets (Class A) should be monitored continuously with fixed online sensors.
This ensures early anomaly detection and extends the window for predictive intervention.
Medium- or low-criticality equipment can be covered through periodic inspection routes with portable sensors, while low-criticality assets can be monitored occasionally or on demand.
What certifications and protections should a sensor have?
Industrial environments present real challenges for sensors: dust, moisture, intense mechanical vibration and explosive atmospheres all call for devices with the right technical specifications.
IP protection rating
The IP code indicates a sensor’s resistance to dust and water. For industrial use, IP66 (full protection against dust and water jets) is the recommended minimum. IP68 certification guarantees resistance to prolonged immersion.
Plants that use high-pressure washdowns for hygiene, such as those in the food industry, should choose sensors with IP69K certification.
Certification for classified areas
In environments with explosion risk (refineries, petrochemical plants, grain silos), sensors with intrinsic safety certification are mandatory. Approvals such as INMETRO, ATEX and IECEx confirm the device won’t act as an ignition source.
Dynamox sensors carry Ex certification for operation in zones 0 and 20, meeting the strictest safety requirements for explosive atmospheres.
Beyond the sensors’ physical certifications, Dynamox also holds international information security certifications (ISO 27001, 27017, 27018 and 27701), which protect the data collected and transmitted through the platform.
Why adopt a hybrid monitoring strategy?
A hybrid strategy combines fixed and portable sensors within the same predictive maintenance program. Instead of standardizing a single technology across every asset, you apply each solution where it delivers the most value.
Benefits of the hybrid approach
This combination reduces risk on critical assets through continuous monitoring, while maintaining visibility across the rest of the plant through periodic routes. As a result, it optimizes investment by concentrating resources where the return is greatest.
A hybrid strategy also makes it easier to evolve your program gradually: you can move assets from portable routes to fixed monitoring as criticality increases or your process matures.
A Practical Example
- In a typical plant, motors, gearboxes and equipment in hard-to-reach areas receive fixed online sensors, such as the HF+. These sensors capture data that helps detect failures in their early stages and identify the root cause.
- Auxiliary pumps, secondary fans and support machinery are covered through routes with portable sensors, like the HF+s Portable. Rollers, moving parts and cylinders receive sensors such as the TcAs or TcAg, configured with alarm levels.
- Electrical busbars that need temperature monitoring can use sensors like the TcAg, which are more affordable and widely deployed at scale.
- Outputs from very low-speed gearboxes can also be fitted with wired sensors.
This setup balances reliability, cost and operational efficiency, making the maintenance program sustainable and aligned with real operating conditions.
How Does the Analytics Platform Complement the Sensors?
The sensor is only one part of the monitoring ecosystem. Collected data still needs to be transmitted, stored and analyzed to generate actionable insights.
Integration with Gateways and the Cloud
Gateways centralize and transmit sensor data to the cloud platform.
They can communicate with the platform via Wi-Fi, ethernet cable or mobile network, ensuring connectivity even in challenging environments.
Cloud infrastructure enables remote data access and removes the need for local servers.
Analysis and diagnostic tools
The Dynamox Platform organizes data into intuitive dashboards, frequency spectrums, trend charts and automatic alerts.
DynaDetect uses artificial intelligence to recognize failure patterns and generate diagnostics.
This integration turns the sensor into a strategic part of predictive maintenance. As a result, teams move away from reactive work and start making decisions based on reliable data.
What mistakes should you avoid when choosing vibration sensors?
A few common mistakes can undermine monitoring effectiveness and drive up unnecessary costs. Knowing them ahead of time helps you avoid these pitfalls when selecting a technology.
1. Standardizing a Single Sensor Type Across the Plant
Each asset has its own criticality, accessibility and operating profile. Applying the same solution to every piece of equipment leads to either under-monitoring critical assets or overinvesting in low-impact machines.
2. Ignoring environmental conditions
Installing sensors without checking temperature, humidity and contaminant levels can cause premature device failure or inaccurate readings. Evaluate the environment before specifying the required protection rating.
3. Underestimating the Importance of Frequency Range
Sensors with a limited frequency range may fail to detect early-stage failures. Check whether your chosen model covers the frequencies linked to the failure modes most relevant to your equipment.
Conclusion: How to Compare Vibration Sensors and Choose the Right One
Comparing vibration sensors requires a technical analysis that accounts for the specific conditions of each application.
There’s no single solution that’s universally better: the best sensor is the one that meets your plant’s requirements for criticality, environment and maintenance strategy.
Evaluate operating temperature, accessibility of measurement points, required collection frequency and the certifications your environment demands.
As a result, consider a hybrid strategy that combines fixed and portable sensors to optimize investment and coverage.
Dynamox offers an integrated ecosystem of wireless sensors, wired sensors, gateways and an analytics platform.
This approach lets you implement scalable monitoring programs tailored to the maturity and needs of each industrial operation.
If you’d like to see how this sensor comparison applies to your own plant, our specialists are ready to talk. Get in touch with us!
Frequently Asked Questions about industrial vibration sensors
Wireless sensors transmit data via radio frequency to gateways or apps, removing the need for cables. Wired sensors use a physical connection for data transmission and suit extreme temperatures or very low speeds. Dynamox offers both options.
Portable sensors work best for medium- or low-criticality assets. For critical equipment, fixed-sensor monitoring is preferable, since it provides automatic, frequent data collection that widens the failure-detection window. Dynamox recommends assessing criticality before defining your strategy.
It depends on the failure modes you need to detect. Early-stage bearing failures generate signals above 2.5 kHz. The DynaLogger HF+ reaches up to 13 kHz, allowing you to identify defects early, before they turn into bigger problems.
Yes, as long as they carry intrinsic safety certification. Dynamox sensors are approved for zones 0 and 20 with INMETRO, ATEX and IECEx certifications, ensuring safe operation in refineries, petrochemical plants and other classified areas.
Scalability is one of the key advantages of wireless sensors. You can start monitoring your most critical assets and expand gradually as your predictive program matures. The Dynamox platform lets you manage hundreds of sensors from a single, centralized system.
It depends on the model: TcAs and TcAg sensors operate between -10°C and 79°C, while the DynaLogger HF+s, in batches manufactured from batch 05 onward, operates up to 105°C (earlier batches were limited to 85°C). For hotter machines, Dynamox’s wired sensors are recommended above 125°C, up to 155°C.