All categories
Featured selections
Trade Assurance
Buyer Central
Help Center
Get the app
Become a supplier
(1295 products available)
Ready to Ship
18mm proximity sensor is an electromechanical device that senses the presence of an object nearby without direct contact. It typically uses fields such as electromagnetic, light, or even a pressure field to detect whether an object is within the sensing range. Proximity sensors are commonly used in industrial automated machinery to detect parts in production lines, control the motion of equipment, and ensure safety by sensing the presence of an individual in restricted zones.
The following are the types of 18mm proximity sensors:
Inductive proximity sensors
These kinds of 18mm proximity sensors are employed to detect metallic objects. They produce an electromagnetic field and are majorly utilized when sensing metallic substances. When a metal approaches, it alters the sensor's electromagnetic field, which then sends a signal indicating that an item has been detected. Inductive sensors are widely used in manufacturing equipment to identify an object and perform quality checks.
Capacitive proximity sensors
These sensors have a capacitance and can detect various object types, solids, and liquids. They operate by emitting an electrical field and, when an object comes within range, changes the capacitance value that is then interpreted by the sensor as a detection. Such sensors work well with non-metallic items such as glass, plastic, and wood, and these are used in counting and ensuring one product at industrial setups.
Photoelectric proximity sensors
Photoelectric sensors are proximity sensors that detect the presence of an object using light. These sensors are employed in the most basic application sense within automated systems. Normally, a photoelectric sensor emits a beam of light, and when an object obstructs this light, it changes the sensor's output. These sensors are good for non-contact detection, especially on shiny or soft surfaces.
Mechanical proximity sensors
Mechanical proximity sensors are based on physical contact principles. These kinds of sensors have switches that get activated whenever an object approaches them, causing a mechanical movement. While mechanical sensors are definitely sheer workhorses in the industry, their effectiveness diminishes further with frequent use. Mechanical ones are mostly used in very simple applications that require on-off control.
Magnetic proximity sensors
These sensors can detect magnetic fields. They contain magnetoresistive materials that change their electrical resistance due to magnetic flux density. A magnetic proximity switch integrated into the system checks for the presence of a magnet on a moving component. This change is then processed as an object detection. Magnetic sensors are applied in situations where mechanical facilities need help to ensure position verification.
Specifications of the sensors vary based on different applications and environments where they will be applied. Knowing industrial specs helps to select the best sensor that fits a need while also assuring sensor performance and durability. Maintenance of 18mm proximity sensors gives good sensor performance and reliability over time and good uptime and efficiency in manufacturing.
Specifications such as the following are often considered:
Sensing distance
This is the maximum distance at which the 18mm proximity sensor can detect an object. Sensing distance directly depends on the type of sensor; inductive sensors have shorter and capacitive sensors with longer sensing distances. Sensing distance needs to be compatible with the application requirements to detect objects appropriately without incurring false readings.
Response time
Response time is the time the sensor takes to detect the object and the signal output once it does. The response time of fast-sensing proximity sensors is suitable for high-speed applications such as assembly lines with quick cycle times. In slower applications, a longer response time is allowed as the movement is not that fast.
Operating temperature range
The operating temperature range indicates the extremes at which the sensor may work effectively. Most of the 18mm proximity sensors are designed to work at 0-50°C. Certain sensors can operate in extreme heat or cold and are better suited for hazardous environments such as furnaces or freezers.
IP rating
The IP rating indicates the sensor's protection levels from dust and water ingress. The higher the IP rating, the better the sensor's protection. In applications for sensors in harsh working environments with exposure to dust, water, or chemicals, higher IP ratings are desired.
Supply voltage
Proximity sensors may have varying supply voltages working over a specific electric range. Common voltage sizes are 10-30V DC and 100-240V AC. It is imperative that the sensor used in that application has a voltage that is compatible with the power supply system.
The following are maintenance tips for 18mm proximity sensors:
Regular cleaning
Proximity sensor cleaning must be done based on the environment in which it operates. Dust, grease, and debris can cause a problem with sensing accuracy. The proximity sensor should be inspected periodically and cleaned using a soft, dry cloth or brush. Do not use water or harsh chemical cleaners that might damage the sensor housing or internal components.
Inspect wiring and connections
Proximity sensor wiring and connections should be inspected regularly since faulty wires or loose connections cause intermittent operations or sensor failure. Look for signs of wear, corrosion, or looseness in the connections and correct them. Ensure all wires are properly shielded and grounded if the sensor is exposed to electrical interference or damage.
Check alignment
Good proximity sensor alignment is necessary for optimal performance. Ensure the proximity sensors are properly aligned with the objects they are supposed to sense and that the sensing field is unobstructed. Misalignment causes reduced sensing distances, incorrect operations, or no operations at all. Readjust the sensor positions if necessary to ensure they are in the correct sensing range.
Testing and calibration
Sensors should be tested periodically to ascertain if they are functioning as required. This can be done by creating conditions where the sensor ought to detect an object and checking its output. Calibration may be required from time to time to keep the sensor within the proper sensing accuracy. Consult the manufacturer instructions about testing and calibration procedures.
Environment monitoring
Magnetic proximity sensor monitoring means keeping track of the environmental conditions within the sensor enclosure. Excesses of heat, moisture, or chemicals can lead to early sensor degradation. Ensure that sensors are in environments that are within their specified operating conditions. Preventing environmental hazards is better than replacing worn sensors.
18 mm proximity sensor finds wide applications across many industries because of their non-contact detection and versatility. They have just become an integral part of many automation systems in the manufacturing industry. Inductive sensors are applied to detect metal, while capacitive sensors can detect non-metal solid and liquid materials in automated production.
These are the common areas where 18mm proximity sensors are used:
Automation and control systems
Proximity sensors are widely used for position sensing, parts detection, and material handling within industrial automation systems. In assembly lines, photoelectric sensors identify the presence of items on a conveyor to ensure proper orientation and eliminate bottlenecks in the production process.
Safety systems
Sensors provide valuable data to safety interlocks and emergency stop systems in industrial safety systems. They have been used to sense the presence of workers in hazardous machine zones, ensuring that dangerous equipment is shut down whenever a person is too close. This helps in reducing workplace hazards and improving safety.
Automated equipment
Proximity sensors are applied in robotic systems for object detection, grasping, and navigation. In 3D printing, magnetic proximity sensors help ascertain the position of moving parts, thus improving the build accuracy. They are also used in CNC machines to detect tool and workpiece positions.
Packaging and labeling systems
Sensors are employed in packaging machinery for counting, filling, and making sure products are in the right packages before sealing. Labeling systems use these sensors to accurately position labels on containers, ensuring a neat and consistent product appearance with proper branding.
Retail and inventory management systems
Proximity sensors are used in retail for automated systems, inventory management, and customer interaction applications. They are integrated into POS systems for detecting customer presence, enabling automatic feedback and interaction. Capacitive sensors are applied in smart shelving systems to monitor stock levels and send real-time inventory data to management systems.
There are various factors to consider for those buying 18mm proximity sensors in bulk so they can get the right product for their businesses. Buyers should think about the different kinds of proximity sensors and which ones are appropriate. Inductive sensors are for metal, while capacitive sensors are for non-metals. Always ensure the sensor's specifications meet the requirements of the task at hand, such as load capacity, working environment, and distance. Buy from reputable manufacturers and ensure the sensors have quality seals so that there will be no problem with replacement in the future.
These are the other considerations buyers should keep in mind:
Sensor type
As mentioned, proximity sensors are used for various applications, with each having advantages. Inductive sensors are most suited for detecting metal objects; capacitive sensors for non-metal solids and liquids, including liquids that are difficult to detect, like water; photoelectric sensors for non-contact detection of all sorts of objects; and mechanical sensors that are affordable, which can work with a very simple on-off control.
Sensing distance
Different 18mm proximity sensors have a different sensing distance, which is the distance at which the sensor can detect an object. Select a sensor that has an appropriate sensing distance for the application. Getting the right sensing distance is important because getting it too far may lead to unsatisfactory detection, while getting it too close may cause disruption in the operations.
Environment
Consider the environment in which the sensor will be installed. Ensure it is protected from exposure to dust, moisture, chemicals, or extreme temperatures. Select an 18mm proximity sensor with an appropriate IP rating for the given application so that it can withstand the harsh environment.
Compatibility
Proximity sensors come in various models that operate at different voltages. It is critical to have a sensor compatible with the system's voltage to ensure proper operation. To get the maximum benefit from 18mm proximity sensors, use the same sensor from the same manufacturer in the management system. This helps ensure certain features, like tuning and calibration, are well understood across the board.
Reliability and maintenance
Since 18mm proximity sensors are used in critical areas of production, one must invest in highly durable and reliable sensors. Find out about the expected life and reliability of a sensor and its resistance to vibration and shock. Consider how much maintenance is required, and go for low-maintenance sensors, especially in hard-to-reach locations.
Cost
Cost is always a consideration. However, it should not be the sole factor. Sometimes, a more expensive sensor can save money on maintenance or increase productivity because of its accuracy. Weigh the costs against several components such as reliability, durability, and long-term savings.
Q1: What is the working principle of an 18mm proximity sensor?
A1: Sensors work by creating an electromagnetic field around themselves and will detect metallic objects within that field. When such an object comes close to the range, it interferes with the field, activating the sensor and sending out an output signal.
Q2: Can 18mm proximity sensors be used in outdoor applications?
A2: Yes, the sensors can be used outdoors, provided they have a suitable IP rating and are able to withstand environmental elements such as water, dust, and extreme temperatures. It is important to select a sensor designed for outdoor use to ensure long-term reliability.
Q3: Are 18mm proximity sensors waterproof?
A3: A few of the 18mm proximity sensors are water-resistant. These are assigned an IP rating of 65 or higher, which indicates that they are protected from water ingress. It is important to note that not all proximity sensors are waterproof; hence, one needs to select the right one.
Q4: How do photoelectric proximity sensors work?
Photoelectric sensors consist of a transmitter and receiver. The transmitter emits a beam of light, and when an object comes into the light beam, it obstructs the beam, and the sensor detects an object and activates an output signal. The sensor type determines the detection principle, such as through beam or reflective.
Q5: Can 18mm proximity sensors be used in robotics?
