Namur signal

NAMUR is a type of sensor output that gives an on or namur signal indication. I will go through some of them here.

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.

Namur signal

Get prepared for the challenges of Industry 4. NAMUR sensors with this output characteristic are marked with "N0" normally-closed characteristics or "N1" normally-open characteristics in the type designation. Note: In explosion-protection applications, the operating location of the intrinsically safe NAMUR sensor is located in the explosion-hazardous area. The isolated switch amplifier must be installed outside the explosion-hazardous area. NAMUR sensors are usually connected to external switch amplifiers that convert the current variation into a binary output signal. Subscribe to our newsletter and receive regular news and interesting information around the world of automation. Discover our online magazine! Exciting success stories, application reports, interviews, and regional news are awaiting you. Continuous innovation, enduring quality, and steady growth have been the foundation of our success for more than 70 years. Begins with Serviceline Industrial Sensors. Product Selector. Knowledge Base for Capacitive Sensors. Capacitive Sensors. Capacitive sensors sorted by connection.

But physical shape and appearance are the only characteristics they have in common.

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. If you are interested in the exact description and its English translation, you can find it easily on the internet.

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? The Namur NE43 is a recommendation that gives a guideline on how a sensor fault can be indicated to a control system by means of the mA signal. When an instrument is calibrated and working properly, its output signal should stay between 4mA and 20mA for as long as process conditions are normal.

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. If you are interested in the exact description and its English translation, you can find it easily on the internet. The NAMUR proximity sensor has been in use for many years but like any electronic device, there are many different symbols in use. NAMUR proximity sensors are used in classified hazardous location areas that have explosive gas, dust, or fibers present.

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Post comment. A proximity sensor will either give or prevent a volt signal to an input module like a PLC. Leave a Reply Cancel reply Your email address will not be published. Get prepared for the challenges of Industry 4. So, there is never a switching event, and no arcs are possible. Pramodh February 7, Note: In explosion-protection applications, the operating location of the intrinsically safe NAMUR sensor is located in the explosion-hazardous area. Mahmoud Salama. This voltage is kept constant by using two different current levels to indicate if the sensor is detecting a target or not. Competition Control Systems. The NAMUR proximity sensor has been in use for many years but like any electronic device, there are many different symbols in use. The two most commonly used proximity sensors are the inductive proximity sensor and the capacitive proximity sensor. Thank you for requesting a quotation. Usually, NAMUR output products which include encoders and proximity sensors are used in classified hazardous location areas which have explosive gas, dust, or fibers present. Please share this article.

As can be seen, the connection has two wires only since these sensors have current and not voltage outputs.

However, when the target object moves away and the sensor no longer senses it, the impedance drops, and the current increases to more than 2. Some of the specific types of proximity sensors that have NAMUR output are capacitive, inductive, magnetic, and photoelectric sensors. Amplify Select Country. Read More Related Posts. Learn from industry experts. Distributed Control Systems History and Applications In this article, you will learn the history and applications of distributed control systems. Maintenance Automation. Pramodh February 7, In explosion-protection applications, the operating location of the intrinsically safe NAMUR sensor is located in the explosion-hazardous area. Got a friend, client, or colleague who could use some of this information? Our devices, including switch amplifiers like the B , A , B , and frequency converters such as , , A , B , A and , are designed for seamless integration with NAMUR sensors. Usually, NAMUR output products which include encoders and proximity sensors are used in classified hazardous location areas which have explosive gas, dust, or fibers present. Register here to receive our newsletter. A proximity sensor is a non-contact type sensor that detects the presence of an object. For Teams.