Method of glycol concentration quality in antifreeze index

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According to the survey, more than 50% of global automotive engine failures originate from the cooling system! This shows the importance of a rational choice of antifreeze. Most of the antifreeze liquids sold on the market are ethylene glycol-based products, and then add appropriate amounts of organic or inorganic salts to achieve anti-corrosion and rust prevention. At present, more than 95% of water-based antifreeze fluids using ethylene glycol at home and abroad are compared with tap water. The most significant feature of ethylene glycol is antifreeze, and water cannot prevent freezing. Secondly, ethylene glycol has a high boiling point, low volatility, moderate viscosity and small changes with temperature, and good thermal stability. Therefore, ethylene glycol antifreeze is an ideal coolant.



As the weather turns cold, the tank is prone to cracking due to freezing and the choice of antifreeze is a top priority for the health of the car's heart. Antifreeze is called antifreeze coolant. It has antifreeze in winter and anti-boiling in summer. It protects the engine's cooling system, improves heat dissipation, and improves engine efficiency.



The basic indicators of antifreeze are freezing point and boiling point. Under normal circumstances, the lower the better the freezing point, the freezing point of the selected antifreeze should generally be less than the local minimum temperature of 10 °C or more, in preparation for sudden changes in the weather. For example, the multi-effect antifreeze produced by Great Wall Lubricants has a freezing point in the range of -25°C to -50°C, which can meet the antifreeze requirements of vehicles in most regions in northern China.



The freezing point of ethylene glycol and water antifreeze is not linear with the mass fraction of ethylene glycol. The freezing point of its aqueous solution does not completely decrease with increasing concentration. When the concentration exceeds 70%, the freezing point rises instead. Therefore, in the preparation process, reasonable selection should be made from the actual point of view in order to achieve the requirements of antifreeze and economy, and prepare the antifreeze solution. In Jiangnan of China, the proportion of ethylene glycol with a mass fraction of 40% is generally used, while in the cold northern China, the proportion of about 50% of the mass fraction of ethylene glycol is appropriate.



Formulation of loader antifreeze

name

Said

ingredient%

Composition ratio

Condensation point °C

≤

Ethylene glycol

alcohol

glycerin

water

Ethylene glycol

antifreeze

60

 

 

40

Volume ratio

-55

55

 

 

45

-40

50

 

 

50

-32

40

 

 

60

-twenty two

alcohol

glycerin

antifreeze

 

30

10

60

Weight ratio

-18

 

40

15

45

-26

 

42

15

43

-32


In the preparation process, reasonable selection should be made from the actual point of view in order to achieve the requirements of antifreeze and economy. In Jiangnan of China, the proportion of glycol with a mass fraction of 40% is generally used, while in cold northern China, the proportion of about 50% of the mass fraction of ethylene glycol is appropriate.



PAL-91S and PAL-92S Mini Digital Glycol Refractometer, known as Antifreeze Concentration Meter, Freezing Point Concentration Meter, is professionally applied to the measurement of ethylene glycol solution, and shows its solution concentration and freezing temperature. Its simple operation, quick display, and stable repeatability can better help our customers in the measurement of frozen liquids (name: antifreeze refractometer), ensuring the normal operation and service life of the car.



For more antifreeze, snowmelt, and freezing point measurement solutions, we will enthusiastically provide a complete, fast on-site analysis trial, please contact Guangzhou AiSheng Scientific Instrument Co., Ltd. Looking forward to your inquiry

Flowmeter

Plastic Flowmeter is a widely used instrument in water treatment engineering, mainly used for flow detection, usually installed after the water pump, to control the water intake of each structure, currently the most widely used are electromagnetic flowmeter and ultrasonic flowmeter. In the selection of the flowmeter, the first thing to consider is the corrosiveness of the measured medium to the flow-passing parts, so as to avoid affecting the service life of the flowmeter due to the corrosion of the medium; During the design and installation process of the flowmeter, the length of the straight pipes before and after the flowmeter needs to be considered. Usually, the principle of 5D before and 3D after the flowmeter is followed. Here, D is the inner diameter of the pipe. If the length is insufficient, the measurement accuracy will be affected. When using an ultrasonic flowmeter, the distance between the first 10D and the rear 5D must be met, and the distance from the flowmeter to the water pump must be more than 30D.

When selecting the type, the flow rate of the medium in the pipeline needs to be between the maximum value and the minimum value of the selected flowmeter, and avoid approaching the maximum or minimum value, so as to avoid affecting the measurement accuracy.

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