News — Refractive Index
How to Convert a Refrigeration System from Mineral Oil to POE Oil Using a Refractometer
Posted by Charlie Downs on
How to Convert a Refrigeration System from Mineral Oil to POE Oil Using a Refractometer
A practical guide to measuring residual refrigeration oil during a lubricant conversion
Converting an existing refrigeration system from mineral oil or another legacy lubricant to polyolester (POE) oil requires more than simply draining the compressor and adding new oil.
The objective is to remove as much of the original lubricant as practical and verify that the amount remaining is within the requirements established for the particular compressor, lubricant, refrigerant and application.
A refractometer provides a practical way to monitor that process.
Edible Oil Refractometers: Measuring Refractive Index for Quality Control & Frying Oil Management
Posted by Charlie Downs on
Edible Oil Refractometers: Measuring Refractive Index for Quality Control & Frying Oil Management
A refractometer is one of the fastest and simplest instruments available for evaluating edible oils and fats. By measuring the refractive index (RI) of an oil, a digital refractometer can help processors, laboratories, food manufacturers, restaurants, and quality-control teams verify incoming raw materials, identify oils, detect changes in composition, monitor production consistency, and establish useful trends as cooking or frying oil ages.
Unlike a conventional Brix refractometer used for sugar solutions, an oil refractometer measures refractive index directly, typically reported as nD at a specified temperature.
For edible oils, that distinction is important. The refractive index is strongly influenced by the oil's fatty-acid composition, degree of unsaturation, chain length, temperature, and other physical characteristics. As a result, a refractometer can provide a remarkably useful "fingerprint" for an oil.
This makes refractive-index measurement valuable from incoming raw-material inspection all the way through finished-product quality control—and even for monitoring frying oil in commercial kitchens and food-production facilities.