Refractometer set (cloud point)
Using 1–2 drops of the test liquid, the hand-held refractometer determines the cloud point of water-propylene glycol, water-ethylene glycol and water-ethanol mixtures, as well as the refractive index of any liquid.
The cloud point
When a antifreeze mixture is cooled down to the freezing point, it does not freeze abruptly at a specific temperature; rather, the freezing process is continuous – i.e.:
at a certain temperature (= cloud point), the mixture forms its first ice crystals, and an increasingly viscous mass then develops, which is completely frozen at a correspondingly lower temperature (= pour point).
The frost point used in most refractometers lies within the range where the antifreeze has already become a viscous mass (slushy ice slurry) and is therefore no longer suitable for applications in the solar or heat pump sectors.
The cloud point
When a antifreeze mixture is cooled down to the freezing point, it does not freeze abruptly at a specific temperature; rather, the freezing process is continuous – i.e.:
at a certain temperature (= cloud point), the mixture forms its first ice crystals, and an increasingly viscous mass then develops, which is completely frozen at a correspondingly lower temperature (= pour point).
The frost point used in most refractometers lies within the range where the antifreeze has already become a viscous mass (slushy ice slurry) and is therefore no longer suitable for applications in the solar or heat pump sectors.
Refractometer set for exact determination of the cloud point.
Contents of the Refractometer Set
- Hand-held refractometer
- Screwdriver for adjusting the zero line
- Pipette for sampling the heat transfer fluid
- PVC box with foam lining