Los sensores de 2 hilos conformes a NAMUR (sensores NAMUR) reciben el nombre de la Asociación de Usuarios de la Tecnología de Automatización en Industrias de Procesos (nombre original alemán: «Normenarbeitsgemeinschaft für Mess- und Regeltechnik der chemischen Industrie» (NAMUR). Se trata de sensores de dos hilos de acuerdo con EN 60947-5-6 (VDE 0660, parte 212) que tienen una característica de distancia/corriente continua o no 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:
Los sensores NAMUR incluyen los siguientes marcados en el tercer bloque de la designación de pedido de Pepperl+Fuchs:
–N = característica de distancia/corriente continua o
–N0 = característica de distancia/corriente no continua
Los sensores están disponibles en las siguientes funciones de conmutación:
Los sensores NAMUR suelen estar conectados a amplificadores de conmutación externos que convierten la variación de corriente en una señal de salida binaria.
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