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MESURE DE NIVEAU / DENSITE PAR BULLAGE
La mesure de niveau par bullage est une manière dérivée de prendre le niveau dans un
réservoir lorsque celui ci est de petite taille ou contient des produits agressifs. L’intérêt vient
du fait que le matériel de mesure est isolé du produit à mesurer.
Le principe nécessite une mise en oeuvre relativement simple. Une canne de bullage est
alimentée en air (ou en gaz) au travers d’un régulateur de débit. L’alimentation peut-être
réalisée par le réseau d’azote ou d’air comprimé du site. (un petit compresseur peut aussi être
utilisé)
La pression d’air injectée dans la canne de bullage doit être supérieure ou égale à la hauteur
maximum de liquide à mesurer (hρg)
Les principales application sont : la mesure de niveau dans les réservoirs à l’atmosphère, la
mesure de niveau différentielle dans les réservoirs sous pressions (bullage différentiel) et la
mesure de densité (bullage différentiel)
Schéma de principe d’une mesure de niveau simple (le réservoir est à pression
atmosphérique. la canne de bullage est constamment immergée)
VEGABAR
Régulateur de débit
alimentation
en air ou gaz
Schéma de principe de la mesure de densité (les cannes de bullage doivent toujours être
immergées)
VEGADIF
Régulateurs de débit
alimentation
en air ou gaz

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186-BULLAGE (3).pdf

  • 1. MESURE DE NIVEAU / DENSITE PAR BULLAGE La mesure de niveau par bullage est une manière dérivée de prendre le niveau dans un réservoir lorsque celui ci est de petite taille ou contient des produits agressifs. L’intérêt vient du fait que le matériel de mesure est isolé du produit à mesurer. Le principe nécessite une mise en oeuvre relativement simple. Une canne de bullage est alimentée en air (ou en gaz) au travers d’un régulateur de débit. L’alimentation peut-être réalisée par le réseau d’azote ou d’air comprimé du site. (un petit compresseur peut aussi être utilisé) La pression d’air injectée dans la canne de bullage doit être supérieure ou égale à la hauteur maximum de liquide à mesurer (hρg) Les principales application sont : la mesure de niveau dans les réservoirs à l’atmosphère, la mesure de niveau différentielle dans les réservoirs sous pressions (bullage différentiel) et la mesure de densité (bullage différentiel) Schéma de principe d’une mesure de niveau simple (le réservoir est à pression atmosphérique. la canne de bullage est constamment immergée) VEGABAR Régulateur de débit alimentation en air ou gaz
  • 2. Schéma de principe de la mesure de densité (les cannes de bullage doivent toujours être immergées) VEGADIF Régulateurs de débit alimentation en air ou gaz