With SCHMIDT + HAENSCH inline refractometers and production lab instruments, it is possible to measure of antifreeze concentration and freezing point depression. Thermal fluids are mixtures of water with ethylene glycol, propylene glycol, or brand names like Glysantin. Refractometers by SCHMIDT + HAENSCH, both inline and bench-top, can measure the mixing ratio and the amount of freezing point depression which makes it easy to ensure frost resistance of mixtures.
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