{"id":8309,"date":"2026-10-30T18:02:34","date_gmt":"2026-10-30T18:02:34","guid":{"rendered":"https:\/\/bama.es\/industrial-sensors-what-they-are-types-and-how-to-choose-the-right-one\/"},"modified":"2026-10-31T03:19:12","modified_gmt":"2026-10-31T03:19:12","slug":"industrial-sensors-what-they-are-types-and-how-to-choose-the-right-one","status":"publish","type":"post","link":"https:\/\/bama.es\/en\/industrial-sensors-what-they-are-types-and-how-to-choose-the-right-one\/","title":{"rendered":"Industrial sensors: What they are, types, and how to choose the right one"},"content":{"rendered":"\n

How many decisions does your plant make every minute without anyone stepping in? Starting a conveyor, closing a valve, rejecting a defective part. None of them would be possible without industrial sensors,<\/strong> the devices that translate what happens on each machine into a language the PLC understands.
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That is why it pays to choose them carefully, not just from a catalog. In this guide, we review the available technologies, how they connect to the control system, and the checklist that separates a reliable installation from one that causes trouble every week.<\/p>\n\n\n\n

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What is an industrial sensor and how does it work?<\/strong><\/strong><\/h2>\n\n\n\n
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An industrial sensor is a device that detects a physical or chemical variable (presence, temperature, pressure, level, flow, or vibration) and converts it into an electrical signal that a control system can understand. Unlike a consumer sensor, it is designed to operate 24\/7 amid dust, vibration, high-pressure water, and electrical interference.<br\/> <\/p>\n<\/div>\n\n\n\n

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Sensor, transducer, and transmitter: Not the same thing<\/strong><\/h3>\n\n\n\n

These three terms are often used interchangeably, but each plays a different role in the measurement chain:<br\/><\/p>\n\n\n\n

Element<\/th>What It Does<\/th>Example<\/th><\/tr>
Sensor<\/td>Responds to the physical variable<\/td>The platinum resistor in a PT100<\/td><\/tr>
Transducer<\/td>Converts one form of energy into another<\/td>The PT100 converts heat into a change in resistance<\/td><\/tr>
Transmitter<\/td>Conditions the signal and outputs a standardized signal<\/td>A head-mounted transmitter that converts the PT100 signal to 4\u201320 mA<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

From sensor to PLC: The data path<\/h3>\n\n\n\n

Every sensor goes through three stages: it captures<\/strong> the variable, conditions<\/strong> the signal (amplifying, filtering noise, and linearizing it), and delivers<\/strong> a standard output. That output reaches the programmable logic controller (PLC)<\/strong>, which decides what to do, and from there it moves up to the operator\u2019s HMI or to the SCADA system that supervises the plant. If the input data is bad, every decision made above it will be wrong. <\/p>\n\n\n\n

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Types of industrial sensors<\/strong><\/h2>\n\n\n\n

There are hundreds of models, but almost all types of industrial sensors<\/strong> can be grouped by the variable they measure. This table serves as a quick map before we look at each family:
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Family<\/th>Main technologies<\/th>What It detects or measures<\/th><\/tr>
Proximity<\/td>Inductive, capacitive, magnetic<\/td>Non-contact object presence<\/td><\/tr>
Photoelectric<\/td>Through-beam, retroreflective, diffuse<\/td>Presence and passage at longer distances<\/td><\/tr>
Temperature<\/td>PT100, thermocouple, NTC, infrared<\/td>Process and surface temperature<\/td><\/tr>
Pressure<\/td>Gauge, absolute, differential<\/td>Fluid and gas pressure<\/td><\/tr>
Level<\/td>Radar, ultrasonic, hydrostatic, float<\/td>Level of liquids and bulk solids<\/td><\/tr>
Flow<\/td>Electromagnetic, Coriolis, vortex<\/td>Flow of liquids, gases, and steam<\/td><\/tr>
Vibration<\/td>MEMS and piezoelectric accelerometers<\/td>Condition of rotating machinery<\/td><\/tr>
Vision and LiDAR<\/td>2D\/3D cameras, laser scanners<\/td>Shape, defects, and obstacles<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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Proximity and photoelectric sensors<\/h3>\n\n\n\n

These are the most widely installed sensors on any line because they detect without contact and do not wear out. Inductive sensors<\/strong> only detect metal and are immune to oil and chips, which is why they dominate in machining. Capacitive sensors<\/strong> detect plastic, wood, liquids, or granular materials, even through the wall of a non-metallic tank. Photoelectric sensors<\/strong> use a light beam and reach longer distances: through-beam (emitter and receiver facing each other), retroreflective (with a reflector), or diffuse (the object itself reflects the light).
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Temperature sensors<\/h3>\n\n\n\n

The choice depends on range and accuracy. The PT100<\/strong> is the benchmark for processes between \u2212200 and 600 \u00b0C thanks to its stability. Thermocouples<\/strong> cover much higher temperatures, up to 1,200 \u00b0C for Type K, in exchange for slightly lower accuracy. NTC thermistors <\/strong>are inexpensive and fast for narrow ranges, and infrared pyrometers<\/strong> measure moving parts or parts too hot to touch without contact.
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Industrial pressure sensors<\/h3>\n\n\n\n

Industrial pressure sensors <\/strong>monitor hydraulic, pneumatic, steam, and water circuits. They measure gauge pressure<\/strong> (relative to atmospheric), absolute pressure<\/strong> (relative to vacuum), or differential pressure<\/strong> (between two points, useful for knowing when a filter is clogging). A well-selected pressure transmitter detects leaks, pump cavitation, or damaged seals before they cause downtime. For viscous or hygienic fluids, versions with a stainless steel isolating diaphragm are used.
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Level and flow sensors<\/h3>\n\n\n\n

For level measurement, radar<\/strong> is the most reliable option in tanks with foam, vapor, or turbulence; ultrasonic sensors<\/strong> are a cost-effective alternative for clean liquids; and float or vibrating level switches <\/strong>are sufficient for high or low level alarms. For flow measurement, electromagnetic flowmeters <\/strong>cause no pressure drop in conductive liquids, and Coriolis flowmeters <\/strong>measure mass directly, which is key in precision dosing.
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Vibration sensors and machine vision<\/h3>\n\n\n\n

Accelerometers installed on motors, pumps, and compressors detect imbalance and bearing wear weeks before a failure. Machine vision and LiDAR, meanwhile, inspect parts, detect defects invisible to the human eye, and guide autonomous vehicles around the plant.<\/p>\n\n\n\n

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Output signals: How a sensor communicates with the PLC<\/h2>\n\n\n\n

Two identical sensors may not work on the same machine if their output does not match the PLC\u2019s I\/O card. That is why the signal type is as important a decision as the sensing technology. These are the most common options:<br\/> <\/p>\n\n\n\n

Output<\/th>What It transmits<\/th>When to choose It<\/th><\/tr>
Digital PNP \/ NPN<\/td>On\/off (part present or not)<\/td>Detection and counting. PNP is the standard in Europe<\/td><\/tr>
Analog 4\u201320 mA<\/td>Continuous value via current<\/td>Long distances and noisy environments; detects broken wires<\/td><\/tr>
Analog 0\u201310 V<\/td>Continuous value via voltage<\/td>Short runs and simple equipment<\/td><\/tr>
IO-Link<\/td>Value, diagnostics, and parameters<\/td>Plants pursuing predictive maintenance and fast changeovers<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

IO-Link<\/strong> deserves special mention. It uses the same standard three-wire cable, but the sensor also sends alerts on contamination, operating hours, or internal temperature. And if it fails, the IO-Link master automatically loads the configuration into the replacement, so the technician does not have to set parameters manually.
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Sensors for industrial automation: Applications and benefits<\/h2>\n\n\n\n

Sensors for industrial automation<\/strong> are found in any process that repeats and must produce the same result every time. These are the most common applications across industry:
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Sector<\/th>Key sensors<\/th>Purpose<\/th><\/tr>
Automotive<\/td>Inductive, vision, safety scanners<\/td>Part positioning, weld inspection, robotic cell protection<\/td><\/tr>
Food and beverages<\/td>Level, flow, IP69K temperature<\/td>Filling, dosing, cold chain<\/td><\/tr>
Pharmaceutical<\/td>Temperature, differential pressure, vision<\/td>Cleanrooms, traceability, batch control<\/td><\/tr>
Logistics<\/td>Photoelectric, LiDAR, scanners<\/td>Sorting, stacker cranes, AGVs<\/td><\/tr>
End-of-line<\/td>Photoelectric, presence, weight<\/td>Case erecting, case sealing, and palletizing<\/td><\/tr>
Collaborative robotics<\/td>Force, torque, laser scanners<\/td>Safe operation alongside workers<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Benefits for your plant<\/h3>\n\n\n\n

Well-designed sensing shows up in production KPIs, not just in the control cabinet:<\/p>\n\n\n\n