Namur signal

NAMUR is a type of sensor output that gives an on or off namur signal. I will go through some of them here. A NAMUR sensor is a non-amplified sensor that supplies two different signal levels depending upon switch state, namur signal.

One could be easily fooled by assuming that a NAMUR sensor is a typical proximity sensor because they look very much alike. But physical shape and appearance are the only characteristics they have in common. As illustrated in our animation, the proximity sensor acts just like a simple switch. When the target is away from the sensor, the switch is open. When the target is close to the sensor, the switch is closed. In most industrial applications today, a proximity sensor is not connected to an actual load resistance but is connected to an input of a PLC or DCS Digital Input Module.

Namur signal

NAMUR sensor is a proximity sensor developed to be used in industrial hazardous areas, where the risk of explosive gases or combustible dust is present or formed in the facility. A proximity sensor is a non-contact type sensor that detects the presence of an object. Proximity sensors can be implemented using various techniques such as optical, ultrasonic, and Hall effects. The two most commonly used proximity sensors are the inductive proximity sensor and the capacitive proximity sensor. A proximity sensor will either give or prevent a volt signal to an input module like a PLC. Standard three-wire proximity sensors use two wires for power and the third for the output, they have either a PNP or an NPN transistor output that switches the sensor if it detects a target. The transistor output works as a mechanical switch powered by a 24 VDC power supply using two wires, the third wire carries the signal status of the sensor and is usually connected to a DI card of a PLC. If you need to install a proximity sensor in a hazardous area that contains a potentially explosive atmosphere, you cannot use a standard three-wire sensor, because when the sensor switches to indicate a detection, the signal wire is connected or disconnected to the power supply, that action can generate an arc which can be a potential source of ignition. The switching manner of the proximity sensor can cause a spark that can be very dangerous if the sensor is installed in a hazardous area. NAMUR sensors are designed to be powered by a switching amplifier that limits the available voltage to 8. This voltage is kept constant by using two different current levels to indicate if the sensor is detecting a target or not. These current levels are usually 1 mA with a target present and 3 mA without one. So instead of a switching manner as in normal PNP or NPN proximity which can be very dangerous in hazardous areas, you now have a 1 mA or a 3 mA to indicate the presence or not of an object.

Mahmoud Salama.

We take a closer look at NAMUR sensors, providing insights into their functionality and highlighting their significant roles across various industrial sectors. Discover the underlying technology behind NAMUR sensors and their importance in different industries. Their initial focus was on setting standards for how different devices connect and work together, such as the mA technology and proximity switches. They did this by forming working groups in four different areas to come up with recommendations and guidelines to improve technology development and integration. These recommendations, identified by the 'NE' designation, aim to define equipment requirements, ensuring they are specifically tailored for applications and purposes. They typically feature more rigorous testing criteria compared to basic standards, leading manufacturers to view compliance with these recommendations as a benchmark for performance.

As can be seen, the connection has two wires only since these sensors have current and not voltage outputs. The power supply necessary for the functioning of the electronics inside the sensor is also conveyed through these two wires. In this case, as the distance S between the sensor and the object to be detected increases, there is an increase in the current in the sensor itself. Such a low output impedance is intended and aimed at avoiding, in the event of a fault, the creation of possible ignition sources in the event of a fault. Of course, for the correct use of devices with NAMUR output, it is necessary to use appropriately designed hardware. The normative reference regarding the electrical output parameters of a NAMUR sensor is the EN Low-voltage switchgear and controlgear — part control circuit devices and switching elements — DC interface for proximity sensors and switching amplifiers NAMUR. NAMUR sensors are typically used in potentially explosive environments, as intrinsically safe devices: the energy that passes through them does not constitute an ignition hazard. If it is also necessary to have a certain degree of functional safety, if the sensor provides protection in this sense, safety hardware with NAMUR inputs is also available. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

Namur signal

The mA analog signal is a widely spread standard in the industry for several good reasons. This type of signal is used by the majority of transmitters, PLCs, and distributed control systems. A variation of their output current between 4 and 20mA means that the transmitter is working perfectly fine and the process value to be measured is within the measurement range. But how should the output signal behave if the process value falls outside the measuring range or if the transmitter fails?

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Competition Control Systems. Follow our social media. PLC Troubleshooting. Discover our online magazine! This voltage is kept constant by using two different current levels to indicate if the sensor is detecting a target or not. Using this technology, there are 2 output current values depending upon the position of the target. Leave a Reply Cancel reply Your email address will not be published. View our Privacy Policy for more information. Pramodh February 7, Discover the underlying technology behind NAMUR sensors and their importance in different industries. It detects a metal object or target in its vicinity through changes in impedance. The fail-safe NAMUR output sensor is used where there is a personal safety hazard to protect personnel when they are working at or near the equipment. NAMUR proximity sensors limit current so that the current is not capable of causing ignition in hazardous atmospheres.

One could be easily fooled by assuming that a NAMUR sensor is a typical proximity sensor because they look very much alike.

Your email address will not be published. Read More Related Posts. Email Address. About Us Careers What's New? Machine Monitoring System in Nutshell The online machine monitoring system is used for rotating equipment to monitor and protect the motors from critical vibration and temperatures. Maintenance Automation. For Individuals. Instead, a NAMUR proximity sensor will produce two different and distinct current output levels corresponding to the target position. We will get back to you by phone or email within 24 hours. In this case, as the distance S between the sensor and the object to be detected increases, there is an increase in the current in the sensor itself. These examples showcase the versatility and importance of NAMUR sensors in different industrial applications. Learn from industry experts.