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Jokisch - Instructions for the RHB-32 Refractometer

As we all know, the machinist's job is accuracy. Therefore, a correct mix of coolant will aid in obtaining an accurately machined part. The refractometer enables the machinist to control mix variables which can affect performance, tool life, corrosion resistance, finish and coolant life.

The refractometer enables you to determine the right top-off mixtures.

Thus, it is extremely important when using watersoluble cutting fluids to determine water loss through evaporation and burn-off. Jokisch Concentrate evaporation rate is considerably less than conventional cutting fluids. High volume water loss is experienced while machining and grinding, however there is very little loss of the orginal concentrate. This is due to its high heat resistance, and combined with the best lubrication properties available, results in superior perfomance for this application.

Correct Top-Off Mixtures

Machining: (Start up mix 1:15) - "Top-off" at 1:35 parts water

Grinding: (Start up mix 1:35) - "Top-off" at 1:70 parts water

Use:

Calibrate your refractometer with the water which you normally use when mixing the coolant. Place a few drops on the prism face and cover. Then set the "horizon line" crossing point to zero, via the adjustment screw.
Place a few drops of coolant (from your equipment's coolant nozzle) onto the refractometer's prism and cover, then read the line to determine the mix ratio by comparing with the chart above.
A well defined line generally indicates good clean coolant. A fuzzy line usually represents coolants contaminated with waylube oils and other foreign particles, which can lead to a false reading.

Important:

When reading coolant mixtures, a clear, defined indicator line represents a good, clean coolant. A fuzzy indication line means that too many foreign oils have been mixed into the coolant thus likely to give an incorrect reading.

To ensure accurate readings, it is very important that readings be taken when the refractometer is approximately at room/indoor temperature. Samples are best obtained from the machine's coolant nozzle, not the tank itself.