Q11: What is a NAMUR sensor?

 

Answer: A NAMUR sensor is a 2-wire proximity sensor that is usually powered by 8 VDC.

 

When the sensor detects the target, the current flow through the sensor drops to less than 1.2 mA. When the target moves away from the sensor and is not detected, the current flow increases to above 2.1 mA.

 

This change in current level is detected by the instrument to determine if the NAMUR sensor is detecting a target. PR products: 5202B, 9202A, 9202B, 5223A, 5223B, 5225.

 

Here is a diagram which illustrates this:

 

 

What is NAMUR?

Answer: NAMUR is an acronym for “Normenarbeitsgemeinschaft für Mess- und Regeltechnik in der chemischen Industrie”.

 

NAMUR was originally founded as a body to represent users of measurement and control technology within the Chemical, Pharmaceutical and Petrochemical industries.

 

Initial work was on the standardization of interfacing to 4-20 mA and proximity switches. Working groups across 4 work areas, create recommendations and worksheets to improve technology development and integration.

 

 

What is a NAMUR recommendation?

Answer: An important aspect of the NAMUR group’s work is their “recommendations”.

 

NAMUR recommendations have an “NE” designation and are used for defining equipment requirements, ensuring they are fit for purpose and suitable for specific application.

 

NAMUR recommendations often influence the content of relevant international standards. The recommendations often include more robust testing over the comparable base standards and manufacturers can see compliance as an indicator of performance.

 

 

 

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