Namur signal

We take a closer look at NAMUR sensors, namur signal, providing insights into their functionality and highlighting their significant roles across various industrial sectors. Discover the underlying technology behind NAMUR sensors and namur signal importance in different industries, namur signal. 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.

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

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. The standard symbol of NAMUR sensors is shown in the picture below: As can be seen, the connection has two wires only since these sensors have current and not voltage outputs. The typical output characteristic of a NAMUR can be represented as follows: 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.

Pramodh February 7, Learn from industry experts.

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.

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.

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? 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.

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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. We take a closer look at NAMUR sensors, providing insights into their functionality and highlighting their significant roles across various industrial sectors. Please call us instead. As can be seen, the connection has two wires only since these sensors have current and not voltage outputs. NAMUR sensors are designed to be powered by a switching amplifier that limits the available voltage to 8. It detects a metal object or target in its vicinity through changes in impedance. Siemens PLC in Hindi. These changes in current levels are then picked up by the switch amplifier and converted into a clear signal that can be used with other equipment downstream. Pramodh February 7, Some of the specific types of proximity sensors that have NAMUR output are capacitive, inductive, magnetic, and photoelectric sensors. When the target is away from the sensor, the switch is open. Maintenance Automation.

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.

Post comment. These recommendations, identified by the 'NE' designation, aim to define equipment requirements, ensuring they are specifically tailored for applications and purposes. NAMUR sensors are essential for precise monitoring and control in various industrial applications. It limits current so that the current is not capable of causing ignition in hazardous atmospheres. Leave a Reply Cancel reply Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. They did this by forming working groups in four different areas to come up with recommendations and guidelines to improve technology development and integration. 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. Add comment Cancel reply. A NAMUR output sensor is required in installations where special safety measures are necessary locations with explosion hazard, or personal safety. Read More Related Posts. 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. Please call us instead. Listen to this article. PID Controller.