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Processus de mesure lors de l‘examen de la
protection antigel
1. Soulevez la couverture du prisme [1] et placez
quelques gouttes du liquide de refroidissement à
mesure à l‘aide de la pipette [10] sur la surface
du prisme [2]. En appuyant sur la couverture du
prisme [1], répartissez uniformément le liquide.
2. Refermez la couverture du prisme [1] et regardez
l‘échelle de mesure à travers l‘oculaire [4].
Orientez ce faisant le réfractomètre avec sa
surface de prisme [2] vers une source de lumière
si possible vive.
3. Tournez l‘anneau de réglage [5] de l‘oculaire [4]
pour régler la visibilité.
4. En fonction de la concentration en antigel, la
limite se déplace sur l‘échelle de mesure. Cette
limite claire-foncée indique sur l‘échelle d‘antigel
[B] directement le point de congélation du mélan-
ge antigel en °C. Ces valeurs affichent la valeur
appropriée pour le propylène (G13) et pour
l‘éthylène (G11 / G12). Si vous ne connaissez
pas l‘antigel rempli ou s‘il s‘agit d‘un mélange
des deux, il faut toujours utilisée l‘échelle pour
le propylène. Ce n‘est qu‘ainsi que la sécurité
d‘une protection antigel suffisante pour le liquide
de refroidissement est garantie.
5. Le résultat de la mesure est influencé par la tem-
pérature du liquide de refroidissement.
6. Nettoyez la pipette livrée avec [10] ainsi que le
réfractomètre après chaque mesure.
* Le propylène est largement utilisé dans l‘espace
européen comme antigel.
** L‘éthylène est largement utilisé dans l‘espace européen
comme antigel.
26


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