Proximity sensors and encoders can have NAMUR output. This amplifier could be dual rated for personal safety and classified hazardous locations for gas, dust, or fibers. 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. This translates to: Standardization Association for Measurement and Control in Chemical Industries. For you to be able to understand how a diode module works, you first need to understand how a single diode actually works.What is a diode? – A NAMUR proximity sensor will produce 2 different and distinct current output levels corresponding to the target position. The pumps are located in a hazardous area, therefore typical proximity/speed sensors are not suitable. The NAMUR proximity sensor operates much like a typical proximity sensor but does not have an open or closed output condition. One could be easily fooled by assuming that a NAMUR sensor is a typical proximity sensor because they look very much alike. Although the sensor may be able to handle a range of voltages (7 VDC to 12 VDC or 5 VDC to 25 VDC), the voltage level should be at 8.2 VDC with 1k ohm resistance as the load.
Let’s begin by reviewing the electrical characteristics of a typical proximity sensor.
In this blog post, you’ll learn about the mindset that helped me getting a PLC programming job with NO experience. When used in these applications, it is imperative that (NAMUR) sensors be used only with an NY2 intrinsically safe relay/amplifier, or a suitably approved, compatible solid state system. The term “NAMUR” is an acronym for a very long German description: “Normenarbeitsgemeinschaft für Mess- und Regeltechnik in der chemischen Industrie”.
So how does a NAMUR proximity sensor ensure safety? Supplying a NAMUR sensor with 100 mA of current between 5 … 60 VDC can fry its circuitry.
A fail-safe output ensures that if there is a failure, the output will sense a problem and fail only in the safe mode.
This translates to: Standardization Association for Measurement and Control in Chemical Industries. Continuous innovation, enduring quality, and steady growth guarantees continued success, since more than 60 years. – A NAMUR proximity sensor will produce 2 different and distinct current output levels corresponding to the target position.
A fail-safe NAMUR version with the appropriate intrinsically/fail-safe barrier can provide both explosion hazard and personal safety protection. You might want to review one of our other articles: How to Wire Discrete DC Sensors to PLC – Part 2. 5 Actionable Tips for Getting a PLC Programming Job with NO Experience. The Zonal protection is usually for European and Class, Division is for North America.
If you are interested in the exact description and its English translation, you can find it easily on the internet. As illustrated in our animation, the proximity sensor acts just like a simple switch.
Pepperl+Fuchs is a leading developer and manufacturer of electronic sensors and components for the global automation market. NAMUR proximity sensors can be capacitive, inductive, magnetic, or can be photoelectric sensors. Inductive Sensors. A NAMUR output sensor can be normally open or normally closed, but usually, it's normally closed. On quick visual inspection, a 2-wire NAMUR sensor looks the same as a standard 2-wire DC sensor.But do not confuse the wiring connections between these two types of sensors. Prevention is the protection principle for intrinsic safety. 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 proximity sensors are used in classified hazardous location areas that have explosive gas, dust, or fibers present. Intrinsically safe applications (hazardous area).
A typical PLC input card is not rated to supply exactly 5 mA of current at 8.2 V to a sensor, which is why a NAMUR sensor must always be connected to an intrinsic safety barrier.
In a nutshell, NAMUR proximity sensors were developed to ensure safety in hazardous locations. Don't Treat a NAMUR Sensor like a Standard Sensor, Electrical Explosion Protection Equipment, Service Level Agreements for ecom instruments.
NAMUR proximity sensors limit current so that the current is not capable of causing ignition in hazardous atmospheres. Depending on the application, you could need any one of these products to detect your target, but if they meet the NAMUR standards, the output would be the same.
If you have any questions about using NAMUR sensors, add them in the comments below and we will get back to you in less than 24 hours.
So let’s get started! The NAMUR output products that have Ex ia (intrinsic safety) approvals can be installed in hazardous (classified) locations, such as Class I, II, III; Division 1, 2; and Zone 0, Zone 1, Zone 2 areas, as long as an approved intrinsically safe (IS) input or barrier is used with the NAMUR output product. – The term “NAMUR” is an acronym for a very long German description. A NAMUR output sensor is required in installations where special safety measures are necessary (locations with explosion hazard, or personal safety). The other protection methods are containment (explosion-proof or flame-proof enclosure) and segregation (purging, pressurization, encapsulation, or oil filled). Photoelectric Sensors, First, some information about NAMUR. When the target is away from the sensor, the switch is open. In previous lessons, we discussed SCADA applications and systems, and the components within them.
OK….let’s move on to the NAMUR proximity sensor. 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. On the inside, NAMUR sensors have different circuitry than standard 2-wire DC sensors and need special treatment. On quick visual inspection, a 2-wire NAMUR sensor looks the same as a standard 2-wire DC sensor. – Namur proximity sensors are considered Intrinsically Safe. If you have any questions about using NAMUR sensors, add them in the comments below and we will get back to you in less than 24 hours. B NAMUR Output A NAMUR Output 1 2 Cylinder Courtesy of Steven Engineering, Inc. 230 Ryan Way, South San Francisco, CA, 94080-6370 Main Office: (650) 58 8-9200 Outside Local Area: (800) 25 8-9200 www.stevenengineering.com Due to approvals required for hazardous environments, intrinsically safe sensor configurations require a NAMUR output sensor and an intrinsic safety barrier.
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. Some of the specific types of proximity sensors that have NAMUR output are capacitive, inductive, magnetic, and photoelectric sensors. Let’s take a look at a real-world example. There are different reasons why you may need a NAMUR sensor. Rotary Encoders,
Approvals/ Certifications, Here’s an example of an active 3-wire proximity sensor in operation. A, Prevention is the protection principle for, Electrical Explosion Protection Equipment, Service Level Agreements for ecom instruments. A fail-safe NAMUR version with the appropriate intrinsically/fail-safe barrier can provide both explosion hazard and personal safety protection. Posted by
If personal safety is needed, there are versions of the NAMUR output that are also fail-safe and have a SIL3 rating (with the appropriate amplifier). SCADA is a collection of hardware and software components. These configurations operate at a lower current and lower voltage to prevent the electrical equipment from causing an explosion. © 2020 RealPars B.V. All rights reserved. So how does a diode module or diode block work? There are 4 NAMUR proximity sensors used to measure the shaft speed on four separate chemical pumps. The standards for NAMUR output sensors are EN 60947-5-6:2000 and IEC 60947-5-6:1999. Created with coffee and tea in Rotterdam. This is my personal experience as someone who searched for a job in this field and as an employer who reviews resumes and interviews candidates for a variety of projects.
The NAMUR proximity sensor has been in use for many years but like any electronic device, there are many different symbols in use. Instead, a NAMUR proximity sensor will produce two different and distinct current output levels corresponding to the target position.
– A typical proximity sensor acts just like a simple switch. Terminology, let’s go…. NAMUR proximity sensors are considered Intrinsically Safe. Pepperl+Fuchs employs 5,600 people worldwide and has manufacturing facilities in Germany, USA, Singapore, Hungary, Indonesia and Vietnam, most of them ISO 9001 certified.
But physical shape and appearance are the only characteristics they have in common. Rotterdam Science Tower, Marconistraat 16, 3029AK Rotterdam, Netherlands.
Magnetic Sensors. We’re going to discuss how this NAMUR sensor differs from other proximity sensors, and we’ll show you where and why these sensors are used in the field. Capacitive Sensors, But do not confuse the wiring connections between these two types of sensors. When you look at a NAMUR output sensor data sheet, it will list nominal voltage (8.2 V), load (1 k ohm), and current for measuring plate detected (<1 mA) and not detected (>2.2 mA) (for normally closed output).
In this article, we’re going to introduce you to a sensor called a NAMUR proximity sensor.
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