Suchergebnisse
Suchergebnisse:
Sensoren nach NAMUR stellen eine binäre Information dar und werden meist als Näherungsinitiator ausgeführt, d. h., der Sensor zeigt an, ob ein Referenzobjekt (z. B. ein Anschlag bei einem beweglichen Maschinenteil) sich in der Nähe befindet oder nicht und funktionieren oft berührungslos.
NAMUR-Sensoren sind Näherungssensoren, die Impedanzänderungen von Metallobjekten erkennen und in ein Signal umwandeln. Sie werden in verschiedenen Industriezweigen eingesetzt, um Geschwindigkeit, Position, Zählung und Abstand zu messen und zu steuern.
Erfahren Sie, wie 2-Draht-Sensoren für Gleichspannungsbetrieb funktionieren und welche Arten von Verpolschutz es gibt. Die Webseite erklärt die Besonderheiten von 2-Draht-Sensoren im Vergleich zu mechanischen Schaltern und gibt Beispiele für Anschlüsse und Betriebszustände.
A NAMUR sensor is a proximity sensor that operates in hazardous areas and limits current flow to prevent ignition. Learn how NAMUR sensors differ from typical proximity sensors and see examples of their use in industrial applications.
- The Namur NE43 Recommendation
- Out-of-range Signal Level
- Hardware Fault Signal Level
- Interpretation of Alarm Threshold Levels by The Control System
- Vendor-Specific Fail-Safe Signal Levels
- 5 Comments
- GeneratedCaptionsTabForHeroSec
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 4-20mA signal. It,therefore, defines two signal levels outside of the normal operation range: 1. Out-of-range level (saturation) 2. Hardware fault level
When aninstrument is calibrated and working properly, its output signal should staybetween 4mA and 20mA for as long as process conditions are normal. Butsometimes it happens that the process conditions deviate from the normaloperation, such as the overfilling of a tank. In thiscase, a NAMUR compliant transmitter can output up to a maximum of 20.5 m...
Smartmeasurement devices are capable of detecting internal faults, like a sensor ora converter failure. Whenthat happens, the microprocessor of a NAMUR compliant instrument will set theoutput signal to 3,6mA or 21,0mA, depending on how the user has set thefail-safe mode. A lot of smart field devices will have a fail-safe mode parameter that will le...
Ideally, the receiving controller should have an input module with a suitable software block that can interpret the input signal within a current range between at least 0 and 22mA. By the NAMUR definition, signals between 3,6 and 3,8mA as well as between 20,5 and 21,0mA cannot occur (see white areas in the above diagram). But if for some reason the...
Not all instrumentmanufacturers follow the NAMUR NE43 recommendation to the letter. Their self-declared“NAMUR compliant” transmitters use deviating values for the hardware faultsignal levels. The hardware fault signal levels may differ according to the transmitter type, even when these transmitters are made by the same manufacturer. This is, for in...
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12. Apr. 2018 · NAMUR is a signaling standard, used primarily on proximity and limit switch devices. It outputs a current signal depending on the state of the switch. The switching spec is >2.1mA (typically but not always for NC) and <1.2mA for the opposite switch state. There is a 0.9mA deadband for noise immunity. The output is usually ...
NAMUR sensors are 2-wire proximity sensors that detect metal objects by changing impedance and current levels. They are used in various industrial sectors such as factory automation, oil and gas, wastewater treatment, and pharmaceutical.
