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Meranie nemrznúcej kvapaliny
1. Nadvihnite kryt prizmy [1] a na povrch prizmy
[2] naneste pomocou priloženej pipety [10]
niekoľko kvapiek chladiacej kvapaliny. Kvapa
-
linu pritlačením krytu prizmy [1] rovnomerne
rozdeľte.
2. Kryt prizmy [1] zatvorte a okulárom [4] sa
pozrite na stupnicu. Povrch prizmy refrakto
-
metra [2] pritom nasmerujte proti jasnému
svetelnému zdroju.
3. Otáčaním nastavovacieho krúžka [5] na okulári
[4] zaostrite optiku.
4. Hraničná línia sa na stupnici posúva v závislos-
ti od koncentrácie nemrznúcej kvapaliny. Táto
svetlo-tmavá hranica indikuje na stupnici [B]
pre nemrznúcu kvapalinu priamo bod mrazu
nemrznúcej kvapaliny v °C. Hodnoty ukazujú
nameranú hodnotu propylénu* (G13) a name-
ranú hodnotu etylénu** (G11 / G12). Ak Vám
nie je známe, ktorá nemrznúca kvapalina sa
v chladiacom systéme nachádza, alebo ak sa
jedná o zmes oboch kvapalín, potom použite
vždy stupnicu pre propylén. Len týmto spôso-
bom je možné dostatočne zistiť stav nemrz-
núcej kvapaliny a jej odolnosť proti mrazu.
5. Teplota nemrznúcej kvapaliny nemá vplyv na
nameraný výsledok.
6. Pipetu [10] a refraktometer po ukončení mera
-
nia dôkladne vyčistite.
* Propylény sa používajú ako nemrznúca zmes prevažne
v Európe.
** Etylény sa používajú ako nemrznúca zmes prevažne
mimo Európy.
Meranie kvapaliny v ostrekovači skla
1. Postup je identický s postupom pri meraní
nemrznúcej kvapaliny.
2. Nameranú hodnotu je možné odčítať na
stupnici pre meranie kvapaliny v ostrekovači
skla [C] v °C, táto udáva orientačnú hodnotu,
pretože zloženie jednotlivých nemrznúcich
kvapalín sa mení.
3. Pipetu [10] a refraktometer po ukončení mera
-
nia dôkladne vyčistite.
56


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