Automated manufacturing requires continuous and autonomous process monitoring. To achieve this, a variety of sensors are needed to keep track of operating conditions and critical variables. The correct selection of sensors also ensures process productivity and safety of both personnel and machines. Motion Tech Automation offers a comprehensive selection of sensors for almost any application.
Capacitive sensors are noncontact devices that activate when a change in capacitance is detected. This type of sensors can detect metallic and nonmetallic objects at short distances, typically no more than 1.25 cm. They work best in clean environments. Common applications include manufacturing, trackpads and touchscreens.
Inductive (Eddy Current) Sensors
Inductive sensors are noncontact devices that activate when a change in a magnetic field is detected. Only metallic objects can interact with a magnetic field, so nonmetallic objects will not be detected. This type of sensors can work in wet and dirty environments, and can detect objects up to 1.5 cm.
Label sensors are, like their name suggest, devices that detect the presence of a label. They use optical, capacitive, or ultrasonic technologies to accomplish this task. Ultrasonic sensors are not affected by metals, so they can sense labels of almost any type but are less accurate than capacitive. Capacitive sensors are more accurate and faster but may struggle to sense metallic labels correctly. Optical sensors typically use infrared light to detect labels, but they cannot detect transparent labels. They are best used at low speeds because their accuracy decreases at high speeds.
Machine Tool Sensors
Machine tool sensors are devices that can be mounted directly to CNC machines to measure and analyze spindle errors due to dynamic and thermal effects. These sensors improve part quality, aid in troubleshooting and reduce spindle rebuilds, among other benefits.
Photoelectric sensors are noncontact devices that activate when a light beam (normally infrared) is interrupted. They work by using a light emitter and a photoelectric receiver. In a through-beam configuration, the emitter and receiver are on opposite sides. In a retroreflective setup, the emitter and receiver are the same location, and a reflector is installed at the opposite side. In a proximity (diffused) arrangement, the light bounces off the object being detected. Through-beam and retroreflective versions can span large distances, meanwhile proximity variants can only be used for short distances.
Magnetic Field Sensors
Magnetic field sensors are noncontact devices for position detection based on measuring magnetic field strength.
Ultrasonic sensors are noncontact devices that can be used for position detection, distance measurement and object detection. They can be used in environments with fog, dust and other impurities, and over large distances (up to 6 meters). An objects’ color, transparency and texture do not affect their capabilities.
Magnetostrictive sensors are noncontact devices used for position measurement. They work by charging a ferromagnetic material (waveguide) with an electric current that briefly interacts with a position magnet’s magnetic field, causing a mechanical pulse in both directions. The returning mechanical pulse is converted into an electrical signal to measure the distance to the position magnet, based on the mechanical pulse’s travel time.
Inclination sensors, like the name implies, are noncontact devices used for continuous rotational movement tracking. They normally work by using an accelerometer that measures the changes in capacitance between one fixed and one moveable electrode.
Pressure, temperature and flow sensors
Pressure, temperature and flow sensors are typically found in most manufacturing plants. They can be used in a wide range of applications and machines.
Condition Monitoring Sensors
Condition monitoring sensors can be used to detect unscheduled stops, faults, vibrations, temperature, relative humidity, barometric pressure and changes in machine behavior. Their main purpose is to provide information about process operating conditions, automate manual inspections and anticipate required maintenances.
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