Os sensores de 2 fios em conformidade com NAMUR (sensores NAMUR) são nomeados de acordo com a User Associação de Tecnologia de Automação em Indústrias de Processo (nome original em alemão: "Normenarbeitsgemeinschaft für Mess- und Regeltechnik der chemischen Industrie", abreviado como: NAMUR). Trata-se de sensores de dois fios de acordo com a norma EN 60947-5-6 (VDE 0660, parte 212) que possuem uma característica de distância/corrente contínua ou não contínua.
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:
Sensores NAMUR são marcados com o seguinte no terceiro bloco da referência do produto da Pepperl+Fuchs:
–N = característica de distância/corrente contínua ou
–N0 = característica de distância/corrente não contínua
Os sensores estão disponíveis nas seguintes funções de comutação:
Os sensores NAMUR geralmente são conectados a amplificadores de comutação externos que convertem a variação de corrente em um sinal de saída binário.
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