Quelle est la longueur de câble maximale que peut avoir un capteur certifié Exi ?

Réponse:
Cela dépend du type de signal de sortie du capteur:

  • Sortie non amplifiée (pont de Wheatstone - mV/V) : Options I4 ou I6
    Notre certificat ISSeP07ATEX012X spécifie que :
    1. La capacité du câble ne peut dépasser 14 nF
    2. L’inductance du câble ne peut dépasser 10 µH

La capacitance de notre câble standard (4 fils) est de 130 pF/m, son inductance de 0,7 µH/m. La longueur maximale est dans ce cas de 14 m car on atteint alors l’inductance maximale.

  • Sortie amplifiée (4…20 mA – 2 fils) : Option C6
    Dans ce cas le même certificat spécifie que :
    1. La capacité du câble ne peut dépasser 53 nF
    2. L’inductance du câble ne peut dépasser 150 µH

La capacitance de notre câble standard (2 fils) est de 150 pF/m, son inductance de 0,65 µH/m. La longueur maximale est dans ce cas de 230 m car on atteint alors l’inductance maximale.

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What is the maximum cable length available for an Exi certified sensor?

[answer] =>

Answer:

It depends on the output signal of the sensor and values on the Exi certificate:

Example with our certificate ISSeP07ATEX012X:

  1. Non-amplified output (Wheatstone bridge – mV/V): Options I4 or I6

Our certificate ISSeP07ATEX012X specifies that:

    1. The capacitance of the cable may not exceed 14 nF
    2. The inductance of the cable may not exceed 10 µH

 The capacitance of our standard cable (4 wires) is 130 pF / m, its inductance 0.7 µH / m. The maximum length is in this case 14 m because we then reach the maximum inductance.

       2. Current output (4…20 mA – 2 wires) : Option C6

In this case, the same certificate specifies that:

    1. The capacitance of the cable may not exceed 53 nF
    2. The inductance of the cable may not exceed 150 µH

 The capacitance of our standard cable (2 wires) is 150 pF / m, its inductance 0.65 µH /m. The maximum length is in this case 230 m because we then reach the maximum inductance

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