What Are Industrial Sensors?

An industrial sensor is a device that detects a physical condition and converts it into a signal that another system can interpret.

The measured condition could be:

• Motion
• Acceleration
• Vibration
• Humidity
• Temperature
• Pressure
• Position
• Flow
• Force
• Proximity
• Gas concentration

A typical sensing process can be simplified as:

Physical condition → Sensor → Electrical or digital signal → Controller → Action

For example, an accelerometer installed on a motor can detect unusual vibration. The sensor sends the measurement to a monitoring system, which can compare the vibration with normal operating conditions and alert maintenance personnel when a significant change occurs.

Industrial sensors are increasingly becoming part of connected automation systems. Current sensor development is focused on areas such as miniaturization, digital communication, sensor fusion, low-power operation, remote monitoring, and improved performance in harsh environments.

What Is an Industrial IMU?

An IMU, or Inertial Measurement Unit, is a sensor system designed to measure motion and orientation.

An IMU commonly combines:

• Accelerometers
• Gyroscopes
• Sometimes magnetometers

An accelerometer measures linear acceleration, while a gyroscope measures angular velocity. A magnetometer can provide information related to the Earth's magnetic field and heading.

Combining these measurements allows an IMU to provide information about how an object is moving and rotating.

IMUs are used in:

• Industrial robots
• Autonomous vehicles
• Drones
• Mobile machinery
• Marine equipment
• Aerospace systems
• Surveying equipment
• Navigation systems
• Construction machinery
• Motion-control systems

How Does an IMU Work?

An IMU measures movement across different axes.

A basic six-degree-of-freedom IMU typically contains:

• A three-axis accelerometer
• A three-axis gyroscope

The accelerometer measures movement or specific force along the X, Y, and Z axes.

The gyroscope measures rotation around those same axes.

A more advanced nine-degree-of-freedom system can add a three-axis magnetometer.

The sensor data can then be combined using algorithms known as sensor fusion.

This helps a control system estimate orientation and motion more reliably than relying on a single sensor.

Types of IMUs

Industrial IMUs vary considerably in performance, construction, and cost.

MEMS IMUs

MEMS, or microelectromechanical systems, are widely used because they can provide small size, relatively low power consumption, and practical performance at a broad range of price points.

They are commonly found in:

• Robotics
• Industrial automation
• Drones
• Mobile equipment
• Autonomous systems
• Motion tracking

Fiber-Optic-Based Inertial Systems

Fiber-optic gyroscope technologies are designed for applications where very low drift and high stability are important.

They can be used in demanding navigation and industrial applications where higher performance justifies greater system complexity and cost.

High-Performance Navigation IMUs

Some industrial and aerospace applications require highly stable inertial measurements over long operating periods.

These systems can use sophisticated gyroscope and accelerometer technologies and are generally designed for applications where navigation accuracy is particularly important.

Industrial Applications of IMUs

Robotics

Robotic systems can use IMUs to understand movement, orientation, acceleration, and changes in motion.

An IMU can complement encoders and other position sensors, particularly when the robot or mobile platform is moving through environments where external positioning information is limited.

Autonomous Equipment

Autonomous industrial vehicles can combine IMU data with GNSS, cameras, lidar, wheel encoders, or other sensors.

This creates a more complete picture of vehicle movement and orientation.

Mobile Construction Equipment

Excavators, cranes, loaders, and other heavy equipment can use inertial sensors to monitor orientation and movement.

This information can support machine control, operator assistance, positioning, and safety-related functions.

Marine Applications

IMUs can be used to monitor the movement and orientation of marine equipment.

Applications include:

• Vessel stabilization
• Navigation
• Offshore equipment
• Survey systems
• Subsea equipment
• Motion compensation

Industrial Safety and Wearables

IMUs can also be integrated into wearable devices that monitor movement.

Industrial research has explored their use for tracking worker posture, motion, and ergonomics.

What Is an Accelerometer?

An accelerometer is a sensor that measures acceleration along one or more axes.

Acceleration describes a change in velocity over time.

Industrial accelerometers are widely used for:

• Vibration monitoring
• Machine condition monitoring
• Motion detection
• Shock measurement
• Tilt sensing
• Equipment protection
• Structural monitoring
• Robotics
• Automotive systems

They can be single-axis, dual-axis, or three-axis devices.

How Does an Accelerometer Work?

Inside an accelerometer is a sensing structure that responds when the device experiences acceleration.

In many MEMS accelerometers, a tiny mass moves relative to the sensor structure. The resulting change is detected electronically and converted into a measurement.

Industrial systems can then use this information to understand:

• How strongly a machine is vibrating
• Which direction the movement is occurring
• How frequently the vibration occurs
• Whether vibration has changed over time

Accelerometers for Vibration Monitoring

One of the most important industrial applications of accelerometers is condition monitoring.

Rotating equipment such as:

• Motors
• Pumps
• Fans
• Compressors
• Turbines
• Gearboxes
• Bearings

normally produces characteristic vibration patterns.

A change in vibration magnitude or frequency can indicate that something has changed inside the equipment.

Possible causes can include:

• Bearing wear
• Misalignment
• Imbalance
• Mechanical looseness
• Gear damage
• Shaft problems
• Resonance

An accelerometer does not automatically diagnose every fault. Instead, it provides vibration data that maintenance systems and engineers can analyze.

Why Vibration Monitoring Matters

Unexpected equipment failure can interrupt production and require emergency maintenance.

Continuous vibration monitoring can provide an earlier indication that equipment behavior is changing.

This supports condition-based and predictive maintenance strategies.

Instead of servicing every machine at exactly the same interval, maintenance teams can use equipment-condition information to prioritize assets that show signs of deterioration.

IMU vs. Accelerometer

Although IMUs and accelerometers are closely related, they are not the same thing.

An accelerometer can therefore be one component inside an IMU.

If a system only needs vibration measurements from a motor, a dedicated accelerometer may be sufficient. If it needs to understand both movement and orientation, an IMU may be more appropriate.

What Are Humidity Sensors?

Humidity sensors measure the amount of moisture present in air or another environment.

In industrial applications, they are often used to measure relative humidity, which describes the amount of water vapor in air relative to the maximum amount the air can hold at a given temperature.

Humidity sensors are used in:

• Manufacturing plants
• Warehouses
• Food processing
• Pharmaceutical facilities
• Electronics manufacturing
• Data centers
• HVAC systems
• Storage facilities
• Laboratories
• Greenhouses
• Control cabinets

Humidity can affect both products and equipment, making monitoring important in many industrial environments.

How Do Humidity Sensors Work?

Several sensing technologies are available.

Capacitive Humidity Sensors

Capacitive sensors measure changes in electrical capacitance caused by changes in moisture.

They are widely used because they can provide practical accuracy, compact designs, and digital outputs.

Resistive Humidity Sensors

These sensors measure changes in electrical resistance associated with moisture.

They can be useful in certain applications but have different performance characteristics from capacitive technologies.

Thermal Conductivity Sensors

Some humidity measurement systems use changes in thermal conductivity to estimate moisture concentration.

These technologies can be useful in specific industrial environments and gas-measurement applications.

Why Humidity Monitoring Matters in Industry

Humidity is not simply an environmental comfort measurement.

Changes in humidity can affect materials, electronics, production processes, and storage conditions.

Protecting Electronic Equipment

Excess moisture can contribute to condensation and electrical problems.

Industrial control cabinets can contain:

• PLCs
• Drives
• Relays
• Contactors
• Communication equipment
• Power electronics

Humidity monitoring can help identify environmental conditions that may increase the risk of moisture-related problems.

Manufacturing Processes

Humidity can influence processes involving:

• Paints
• Coatings
• Adhesives
• Inks
• Powders
• Paper
• Textiles
• Food products

Maintaining an appropriate environmental range can help maintain consistent process conditions.

Food Storage

Humidity can influence the quality and shelf stability of certain food products.

Too much moisture can contribute to condensation, microbial growth, texture changes, or packaging problems, depending on the product and storage environment.

Pharmaceutical Manufacturing

Pharmaceutical production and storage can require carefully controlled environmental conditions.

Humidity monitoring may form part of environmental monitoring systems used to maintain appropriate conditions for materials and products.

Specific requirements depend on the manufacturing process and applicable regulations.

Data Centers

Electronic equipment generates heat and requires controlled environmental conditions.

Temperature and humidity sensors can help monitor the data-center environment and identify conditions that could contribute to condensation or equipment problems.

Temperature and Humidity Sensors Often Work Together

Humidity measurements are strongly related to temperature.

For this reason, many industrial humidity sensors also measure temperature.

The combined information can be used to calculate or monitor other environmental conditions, such as:

• Relative humidity
• Dew point
• Condensation risk
• Environmental stability

For example, an industrial control cabinet may become significantly colder when equipment is shut down. If the temperature reaches the dew point, moisture can condense on surfaces.

Monitoring both temperature and humidity can therefore provide more useful information than monitoring humidity alone.

Comparing IMUs, Accelerometers and Humidity Sensors

These three technologies measure very different physical properties.

They can also be used together.

For example, an industrial machine could use an accelerometer to monitor vibration, an IMU to track equipment movement, and humidity and temperature sensors to monitor the surrounding environment.

Key Specifications to Consider

Choosing a sensor requires more than checking its measurement range.

Measurement Range

The sensor should cover the conditions it will encounter.

An accelerometer designed for low-level vibration may not be appropriate for extremely high shock levels.

Similarly, a humidity sensor must operate across the expected environmental range.

Accuracy

Accuracy indicates how closely the measurement corresponds to the actual value.

The required accuracy depends on the application.

A general environmental monitoring application may have different requirements from a precision manufacturing process.

Resolution

Resolution describes how small a change the sensor can detect.

High-resolution sensing can be valuable when monitoring gradual equipment changes.

Sampling Rate

For vibration applications, sampling rate is particularly important.

A sensor must collect data quickly enough to capture the frequencies relevant to the machine being monitored.

Frequency Response

Accelerometers used for vibration analysis should be evaluated according to their usable frequency range.

Different faults can appear at different vibration frequencies.

Operating Temperature

Industrial sensors may need to operate in hot, cold, or rapidly changing environments.

Always check the manufacturer's specified operating range.

Environmental Protection

Industrial installations can expose sensors to:

• Dust
• Water
• Chemicals
• Oil
• Vibration
• Shock
• Humidity

The appropriate enclosure and protection rating depend on the installation environment.

Output and Connectivity

Sensors can provide different types of outputs, including:

• Analog signals
• Digital signals
• I²C
• SPI
• Industrial Ethernet
• IO-Link
• Wireless communication

The sensor needs to be compatible with the receiving controller or monitoring platform.

Sensor Calibration and Maintenance

Even a high-quality sensor can produce unreliable data if it is improperly installed, damaged, contaminated, or incorrectly calibrated.

Calibration helps compare sensor measurements against a known reference.

Maintenance requirements vary by sensor type.

Accelerometers

Check:

• Mounting
• Cable condition
• Mechanical damage
• Calibration
• Signal quality

Incorrect mounting can affect vibration measurements.

IMUs

Check:

• Calibration
• Mechanical alignment
• Temperature effects
• Electrical connections
• Software configuration

Humidity Sensors

Check:

• Sensor contamination
• Condensation exposure
• Calibration
• Environmental drift
• Protective filters

The required calibration schedule depends on the application and manufacturer's specifications.

Wired vs. Wireless Industrial Sensors

Industrial sensors can be connected using cables or wireless networks.

Wired Sensors

Advantages include:

• Reliable communication
• Continuous power availability
• Established industrial interfaces
• Low communication latency

They are commonly used in fixed production equipment.

Wireless Sensors

Wireless systems can be useful where installing cables is expensive or difficult.

They can be deployed on:

• Rotating machinery
• Remote equipment
• Temporary monitoring points
• Large facilities
• Hard-to-access assets

However, wireless systems require consideration of battery life, signal coverage, interference, cybersecurity, and network reliability.

Smart Sensors and Industrial IoT

Industrial sensors are increasingly becoming part of the Industrial Internet of Things, or IIoT.

A smart sensing system may include:

Sensor → Edge device → Industrial network → Analytics platform → Maintenance or control action

Instead of simply displaying a measurement, a connected system can store and analyze sensor data over time.

For example, an accelerometer can continuously record vibration data from a pump.

Software can compare current readings with historical operating conditions and identify unusual changes.

This approach can support:

• Predictive maintenance
• Remote monitoring
• Asset management
• Energy optimization
• Production monitoring
• Equipment diagnostics

Modern industrial sensor development is increasingly focused on combining sensing with connectivity, diagnostics, and local processing.

Sensor Fusion

One of the important trends in industrial sensing is sensor fusion.

Sensor fusion means combining information from multiple sensors to produce a more useful understanding of an asset or process.

For example:

Accelerometer + temperature sensor + humidity sensor

can provide a broader picture of machine condition and its operating environment.

In robotics:

IMU + encoder + camera + GNSS

can provide more complete motion and positioning information than any single sensor could provide.

The goal is not simply to collect more data. The goal is to combine complementary measurements to improve the reliability and usefulness of the overall system.

2026 Trends in Industrial Sensor Technology

Industrial sensor technology is moving toward greater connectivity, intelligence, and integration.

Smaller Sensor Packages

MEMS technology is allowing manufacturers to create increasingly compact sensing devices.

Smaller sensors can be easier to integrate into robots, machines, mobile equipment, and embedded systems.

Edge Processing

Instead of sending every raw measurement to a central server, some systems can process data closer to the sensor.

This can reduce communication requirements and allow faster responses to important events.

Predictive Maintenance

Accelerometers and other condition-monitoring sensors are increasingly being connected to predictive maintenance systems.

The objective is to identify changes in equipment condition before they become major failures.

Wireless Monitoring

Wireless industrial sensors are gaining attention for applications where traditional wiring is difficult or expensive.

Battery life and network reliability remain important selection factors.

Sensor Fusion

Combining different sensor technologies is becoming more common in robotics, autonomous machinery, industrial vehicles, and smart manufacturing.

AI-Assisted Analytics

AI and machine-learning systems can analyze large volumes of sensor data and identify patterns that may be difficult to detect manually.

For industrial applications, the quality of the underlying sensor data remains critical. Advanced analytics cannot compensate for poorly installed or incorrectly configured sensors.

More Intelligent Sensors

Sensors are increasingly incorporating features such as:

• Digital outputs
• Self-diagnostics
• Local processing
• Configuration memory
• Communication interfaces
• Condition monitoring

This is gradually changing the role of sensors from simple measurement components into connected industrial devices.

How to Choose the Right Industrial Sensor

Before selecting an IMU, accelerometer, humidity sensor, or another industrial sensor, define the application first.

Ask:

1. What physical parameter needs to be measured?
2. What measurement range is required?
3. What accuracy is necessary?
4. How quickly does the measurement need to update?
5. What environmental conditions will the sensor face?
6. Is the sensor exposed to water, dust, chemicals, or vibration?
7. What output does the control system require?
8. Is wired or wireless communication more practical?
9. How often will calibration be required?
10. Can the sensor integrate with the existing PLC, SCADA, or IIoT platform?
11. What maintenance access is available?
12. What is the expected operating life?

A sensor that performs well in a laboratory may not necessarily be suitable for a production floor.

Common Industrial Applications

The exact sensor configuration depends on the equipment and measurement requirements.

Final Thoughts

Industrial sensors provide the measurement foundation for modern automation and equipment monitoring.

IMUs are particularly useful when machines need information about movement and orientation. Accelerometers are widely used for vibration and condition monitoring, especially on rotating equipment. Humidity sensors help manufacturers monitor environmental conditions that can affect products, processes, electronics, and equipment.

The most effective sensor strategy is not necessarily the one with the highest specification. It is the one that matches the actual application.