Simply put a few drops of the liquid into the stainless-steel sample tray with the glass prism, close the lid, start the measurement and read the result on the display. In the operating instructions for the vehicle or the system, you will find information on the mixing ratio of the antifreeze. This should be observed not only in winter but all year round, as additives for corrosion protection and for maintaining the coolant circulation are also added to the antifreeze. Workshops for motor vehicles often check the mixture ratio above the freezing point of the cooling water. For many areas, a freezing temperature of the coolant of -27°C is recommended. The addition of "antifreeze" is also necessary in frost-free areas, as this not only lowers the freezing point of the coolant but also increases its boiling point. If you have measured the values that are beyond the recommended range, you can remove some cooling water and add either antifreeze or water as required. Then carry out a new measurement with the antifreeze refractometer.
Per measurement, the car measuring device can determine either the concentration or the freezing point of the mixture. If you want to check both, carry out two measurements. Before starting the measurement, select the desired characteristic curve in the menu of the device:
> S01 - Concentration of ethylene glycol in the coolant in percent by volume
> S02 - Freezing point of coolant with ethylene glycol
> S03 - Concentration of propylene glycol in the coolant in percent by volume
> S04 - Freezing point of coolant with propylene glycol
When measuring, a distinction must be made between the antifreeze agents based on ethylene glycol and those based on propylene glycol.
Ethylene glycol (also monoethylene glycol, ethylene glycol, ethanediol) is mainly used in motor vehicles. With this glycol, the freezing point of the cooling water drops to around -10 °C to -40 °C at a proportion of 20 to 50 percent, depending on the manufacturer. With a higher proportion of ethylene glycol, the freezing point rises again and is around -13 °Celsius when used undiluted. Propylene glycol (also monopropylene glycol, propanediol) is less toxic and is decays more quickly. It is therefore used for cooling and heating systems in the food and pharmaceutical industries, as well as for solar systems and heat pumps. The freezing point of propylene glycol drops down with increasing concentration to approx. -59 °C in an undiluted application.
The manufacturer has designed the car measuring device to protect the glass prism from damage. The simple operation guarantees user-friendly handling and almost excludes the wrong operation of the car measuring device. In order to save the battery of the instrument, the manufacturer has equipped the car measuring device with an automatic switch-off function. When not in use, the car measuring device switches off automatically after one minute. If necessary, the user can calibrate the car measuring device himself at any time by placing a few drops of distilled water in the measuring tray and pressing a button to start the calibration.
The task for a reputable manufacturer is to offer good quality and safety. The user wants a reliable product with long service life. What both want is to avoid mistakes and failures. The use of auxiliary equipment - such as a coolant refractometer in this case - reduces the risk of equipment failure and that quality deteriorates significantly during the manufacturing process. Modern high-performance equipment often causes the substances and liquids to heat up, and the use of coolants and antifreeze of poor quality will guarantee cause breakdowns and rapid wear. A portable car measuring device is an instrument that allows the driver and operator to strictly control the condition of the liquids used to support the engine operation. Both too low and too high concentrations can mean for the engine and other parts of the vehicle the end of the service life. The system can become clogged with dirt, surfaces can overheat, various types of corrosion, leaks and many other problems can occur - this is the result of using the antifreeze or coolant with unnecessary additives and bubbles. In everyday life, the car measuring device is a reliable guardian that contributes to the long life of the vehicle with very few problems.