1. What are the equipment and instruments for lubricating oil moisture detection?
Karl Fischer titrator: This is a standard instrument commonly used for the determination of water content, which accurately measures the water content of oil by means of chemical titration.
Infrared moisture analyzer: uses infrared spectroscopy technology to detect the moisture content in oil for rapid and non-destructive analysis.
Microwave moisture analyzer: uses the principle of microwave radiation to detect the moisture content in oil, which is usually fast and efficient.
Capacitive moisture analyzer: The effect of moisture in oil on capacitors is used to measure moisture content, with high accuracy.
Ultraviolet spectroscopy: Indirectly detects moisture content by analyzing the UV absorption characteristics of oil samples.
Ultrasonic moisture analyzers: Utilize ultrasonic technology to measure the moisture content of oil, often non-invasive and highly accurate.
Second, the method of lubricating oil moisture detection
Karl Fischer titration: This is a widely used method for determining water content, which measures the water content by reacting the titration solution with the water in the sample to be measured.
Infrared analysis: Infrared spectroscopy is used to measure the water content of lubricating oils, and the analysis is based on the specific absorption peaks of water molecules in the infrared spectrum.
Gas chromatography (GC): GC can be used to analyze the water content of lubricating oils, and the components in the sample are separated and quantified by a gas chromatography column.
Conductivity method: Measure the conductivity of a lubricating oil sample, as the presence of water increases the conductivity of the sample, thus indirectly inferring the water content.
Density method: The density of water is different from that of lubricating oil, and the amount of water in it can be estimated by measuring the density of a sample of lubricating oil.
Ultrasonic technology: Ultrasonic technology is used to measure the water content in lubricating oil, and the water content is inferred by the difference in the speed of ultrasonic waves propagating in different media.
Capacitive detection method: The capacitor principle is used to detect the moisture content in the oil, and the moisture will change the capacitance of the capacitor, so as to measure the water content.
Drying method: A sample of lubricating oil is dried at a certain temperature for a period of time, and then the moisture content is inferred based on the mass loss.
3. The standard for the detection of water content of lubricating oil
Domestic Standards (GB): The National Standardization Administration (SAC) has developed a number of standards related to lubricants, including GB T 76006-2008 "Moisture Determination Method for Petroleum Products, Lubricating Oils and Related Products (Coulometric Titration)".
Industry standards: such as those for the petroleum and chemical industries (standards developed by companies such as Petrochina, Sinopec, etc.), which may also have regulations for the detection of moisture content in lubricating oils.
ASTM International: ASTM International has developed several standards for lubricant testing, such as ASTM D6304-07(2018) -Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer titration。
ISO International Standards Organization: ISO also has standards for lubricant testing, such as ISO 6296:2020 - Petroleum Products - Determination of Water by Distillation.
Fourth, the national standard for the moisture content of lubricating oil
The relevant standard for the moisture content of lubricating oil in the Chinese National Standard (GB) is GB T 76006-2008 "Moisture Determination Method for Petroleum Products, Lubricating Oils and Related Products (Coulometric Titration)". This standard specifies the use of coulometric titration for the determination of water content in petroleum products, lubricants and related products. Coulometric titration, also known as Karl Fischer titration, is a widely used method for determining moisture content and is commonly used in the lubricant industry.
gb/t 7600.The 6-2008 standard describes in detail the experimental procedure for the determination of moisture content in lubricating oils and related products by coulometric titration, including the preparation of specimens, the calibration of instruments, and operating procedures. The implementation of this standard helps to ensure the accurate determination of moisture content in lubricant products and ensure that the quality of products meets the specified standards.