Hydraulic oil quality testing method instrument and standard analysis

　　First, what are the methods of hydraulic oil quality detection?

　　There are many ways to test the quality of hydraulic fluids, and the specific choice depends on your test objectives, equipment and budget. The following are some common hydraulic oil quality testing methods.

　　1, viscosity measurement: viscosity is one of the key indicators of hydraulic oil quality. Common viscosity measurement methods include absolute viscosity measurement, relative viscosity measurement and kinematic viscosity measurement.

　　2, density measurement: density is another important performance indicator of hydraulic oil. The density can be measured by a densitometer or buoy method.

　　3, moisture analysis: moisture has an important impact on the performance and stability of hydraulic oil. Moisture can be measured by methods such as Carl Fischer titration, Coulometry, or infrared spectroscopy.

　　4, pollutant analysis: impurities and pollutants in hydraulic oil can affect its performance. Common methods of pollutant analysis include particle size analysis, elemental analysis and color detection.

　　5, acid value determination: acid value is the measurement of acidic components in hydraulic oil, usually measured by acidity titration.

　　6, alkali value determination: alkali value determination is used to measure the content of alkaline components in hydraulic oil, common methods include acidity titration and differential titration.

　　7, oxidation stability test: the oxidation stability of hydraulic oil is an important indicator of its service life. Common oxidation stability test methods include rotary pressure autooxidation stability test (RPVOT) and sediment formation test.

　　8, wear resistance test: wear resistance is an important performance indicator of hydraulic oil, which can be measured by four-ball friction test and other friction test methods.

　　9, foam inhibition test: the foam inhibition of hydraulic oil is one of the key properties, can be measured using the foam test bench.

　　10, filter performance test: the filter performance of hydraulic oil is crucial to the normal operation of the system. Filter performance is evaluated using light transmittance or particle counting methods.

　　11, wear resistance test: the wear resistance of hydraulic oil can be evaluated by various methods, such as FZG test, Vickers test and Timken test.

　　12, oxidation product detection: detection of oxidation products in hydraulic oil to assess its stability and service life.

　　Hydraulic oil quality testing products: on-line oil monitoring system

　　The above are some common methods of hydraulic oil quality inspection, the specific choice depends on your needs and test objectives. In order to ensure the accuracy and reliability of testing, relevant international, national or regional standards and procedures should usually be followed.

　　Second, what are the hydraulic oil quality detection analyzers?

　　There are many kinds of hydraulic oil testing and analysis instruments, which are used to test various properties and characteristics of hydraulic oil. The following are some examples of common hydraulic oil detection and analysis instruments.

　　1, viscosity tester: used to measure the viscosity of hydraulic oil, including kinematic viscosity, absolute viscosity and relative viscosity tester.

　　2, density meter: used to measure the density of hydraulic oil, can be achieved by buoy method or digital density meter.

　　3, moisture analyzer: used to measure the moisture content of hydraulic oil, including Karl Fischer titrator, coulometry instrument and infrared spectrometer.

　　4, particle counter: used to analyze the solid particles in hydraulic oil to evaluate the cleanliness and filtration performance of the oil.

　　5, acid value titrator: used to determine the content of acidic components in hydraulic oil, usually using acidity titration method.

　　6, alkali titrator: used to measure the content of alkaline components in hydraulic oil, usually using acidity titration or differential titration method.

　　7, oxidation stability test equipment: used to evaluate the oxidation stability of hydraulic oil, including rotary pressure automatic oxidation stability test (RPVOT) instrument.

　　8, foam test bench: used to measure the foam suppression performance of hydraulic oil to evaluate the foam stability of oil in the hydraulic system.

　　9, filter performance tester: used to evaluate the filter performance of hydraulic oil, including particle counting method and transmittance test.

　　10, wear resistance test equipment: used to evaluate the wear resistance of hydraulic oil, including FZG test bench, Vickers testing machine and Timken testing machine.

　　11. Oxidation product detector: used to detect oxidation products in hydraulic oil to assess its stability and service life.

　　12, drop point tester: used to determine the drop point of hydraulic oil, that is, the temperature at which the oil begins to release steam during the heating process.

　　13, anti-wear test equipment: used to evaluate the anti-wear performance of hydraulic oil, including four ball friction tester and Timken tester.

　　14, infrared spectrometer: used to analyze the composition of hydraulic oil, impurities and moisture content.

　　These instruments can be used to determine different performance parameters of hydraulic fluids to ensure that they meet specifications and meet the requirements of the equipment. Which instrument you choose will depend on your testing needs and the equipment in your laboratory or workplace.

　　Third, what is the national standard for hydraulic oil testing, which?

　　The testing of hydraulic oil usually requires reference to national or regional standards and regulations to ensure the accuracy and reliability of the test. National standards for hydraulic fluids vary by country and region, and these standards may be constantly updated and revised. The following are examples of hydraulic oil testing standards in some common countries or regions.

　　1, China's national standards: China's hydraulic oil testing and quality control usually follow China's national standards (GB/T) or industry standards. For example, GB/T 11119-2020 "Hydraulic oil for hydraulic transmission" and GB/T 7991-2008 "Method for the determination of pH value of hydraulic oil" and other standards.

　　2, American standards: Hydraulic oil testing in the United States usually follows ASTM international standards, such as ASTM D6158-07 "Test method for Iron Content in Hydraulic oil".

　　3, European standards: The testing of hydraulic fluids in Europe may follow the European standard EN, such as EN ISO 6743-4 "Lubricants and related products for Industrial use (Category H)- Part 4: Classification of hydraulic systems and minimum requirements for hydraulic fluids".

　　4, international standards: International hydraulic oil testing may refer to ISO(International Organization for Standardization) standards, such as ISO 4406 "Hydraulic oil pollution Level".

　　The specific version and scope of application of these standards may be updated from time to time, so when conducting hydraulic oil testing, you should always consult the latest standard documents to ensure compliance with relevant regulations and requirements. In addition, the specific test methods and requirements may also vary depending on the type and use of hydraulic oil, so depending on the needs of the hydraulic system and equipment, you may need to consult specific standards and procedures.

　　Four, hydraulic oil testing several levels of qualified standards

　　The eligibility criteria for hydraulic oil testing are usually based on particle counts and contamination levels. Common hydraulic oil contamination levels are usually represented by ISO 4406 standards or NAS (National Aerospace Standard) standards, which classify hydraulic oil contamination levels into different levels. The following are examples of ISO 4406 and NAS standards.

　　ISO 4406 standard: The ISO 4406 standard is used to indicate the number and size of solid particles in hydraulic fluids. It uses a three-level code, such as "XX/XX/XX", where each "X" represents a level code. The ISO 4406 standard typically uses two level codes to indicate the number of solid particles in different particle size ranges, while a third level code indicates the number of large particles. For example, ISO 4406 code "18/16/13" indicates:

　　The first level code (18) : indicates the number of particles greater than 4μm in diameter.

　　Second level code (16) : indicates the number of particles larger than 6μm in diameter.

　　Third level code (13) : indicates the number of particles with a diameter greater than 14μm.

　　A lower ISO 4406 code indicates cleaner hydraulic oil, while a higher code indicates more contamination.

　　NAS Standards: NAS standards (National Aerospace Standard) are commonly used to assess contamination levels of aerospace and aerospace hydraulic fluids. The NAS code uses three numbers to represent the number of particles in different size ranges. For example, the code "6/5/3" for the NAS 1638 standard means:

　　The first number (6) indicates the number of particles larger than 5μm in diameter.

　　Second number (5) : Indicates the number of particles larger than 15μm in diameter.

　　Third number (3) : Indicates the number of particles larger than 25μm in diameter.

　　A lower NAS code indicates cleaner hydraulic oil, while a higher code indicates more contamination.

　　Specific eligibility criteria may vary by application, device manufacturer, and industry. In general, the quality of hydraulic oil should meet the requirements of a specific pollution level to ensure the normal operation of the equipment and achieve the required performance indicators. To determine whether the hydraulic oil is qualified, the contamination level of the hydraulic oil should be viewed according to the requirements of the equipment manufacturer and the applicable industry standards.

　　Five, what is the water content standard of hydraulic oil?

　　Standards for moisture content in hydraulic fluids often vary by country, region, and application. Different industries and equipment manufacturers may develop their own standards or guidelines for the allowable moisture content in hydraulic fluids. In addition, the type and use of hydraulic oil will also affect the moisture content standard.

　　1. ISO standard

　　The International Organization for Standardization (ISO) has issued a number of standards related to hydraulic fluids, some of which include limits on moisture content. For example, the ISO 11171 standard specifies the light refraction method used to determine the moisture content, but does not specify the allowable moisture content. Specific moisture content limits may be mentioned in specific hydraulic fluid specifications.

　　2. ASTM standard

　　The American Society for Materials and Testing (ASTM) has issued several standards related to the quality of hydraulic fluids, but there is also no uniform moisture content limit. The ASTM D6304 standard describes the determination of moisture in hydraulic fluids by coulometry, but the specific moisture limits depend on the type and use of hydraulic fluids.

　　3, industry standards and manufacturer specifications

　　Detailed regulations on hydraulic oil moisture content can be found in manufacturer specifications for certain industries and specific equipment. These regulations are usually based on the requirements of the application.

　　The moisture content of the hydraulic oil should be kept at an extremely low level to ensure the performance and reliability of the system. In general, the moisture content in hydraulic oil should be controlled at a level of a few percent (ppm, that is, one part per million) or less to avoid adverse effects on the system. The specific moisture content limit should be determined based on the needs of your equipment and application, and should follow the relevant specifications of hydraulic fluids and manufacturer recommendations. When conducting hydraulic oil testing, appropriate moisture analysis methods can be used to ensure that the moisture content meets the requirements.

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