I sensori a 2 fili conformi a NAMUR (sensori NAMUR) prendono il nome dall'Associazione degli utilizzatori della tecnologia di automazione nelle industrie di processo (nome originale tedesco: "Normenarbeitsgemeinschaft für Mess- und Regeltechnik der chemischen Industrie", abbreviato: NAMUR). Si tratta di sensori a due fili conformi alla norma EN 60947-5-6 (VDE 0660, parte 212) che hanno una caratteristica di distanza/corrente continua o non continua.
Area 0: unactuated area
Red area between 0/I: impermissible area of the switch amplifier
Area I: actuated range
Area ≤ 0.15 mA: lead breakage
Area ≥ 6.5 mA: short circuit
In addition, Pepperl+Fuchs offers NAMUR sensors with binary switching characteristics. NAMUR sensors with this output characteristic are marked with "N0" (normally-closed characteristics) or "N1" (normally-open characteristics) in the type designation.
Area 0: unactuated area
Red area between 0/I: impermissible area of the switch amplifier
Area I: actuated range
Area ≤ 0.15 mA: lead breakage
Area ≥ 6.5 mA: short circuit
Pepperl+Fuchs offers various switch amplifiers for NAMUR sensors for explosion-protection applications and standard applications.
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.
A blue-sheathed sensor cable visually identifies the NAMUR circuit as intrinsically safe.
Example:
I sensori NAMUR sono contrassegnati con quanto segue nel terzo blocco dell'ordine di acquisto Pepperl+Fuchs:
–N = caratteristica di distanza/corrente continua o
–N0 = caratteristica di distanza/corrente non continua
I sensori sono disponibili nelle seguenti funzioni di commutazione:
I sensori NAMUR sono solitamente collegati ad amplificatori di commutazione esterni che convertono la variazione di corrente in un segnale di uscita binario.
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