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Excessive moisture in the oil will severely affect the lubrication performance of the equipment; it is necessary to keep the moisture content in the oil as low as possible. Purpose of detecting moisture in oil: 1. Moisture can cause the oil to emulsify, reducing its quality and the strength of the oil film, thereby diminishing its effectiveness. 2. Moisture promotes the oxidation and deterioration of oils, increases sludge, and worsens oil quality. It even accelerates the corrosion of metals by organic acids, for example by reducing the insulation properties of transformer oil. 3. Moisture causes the additives in the oil to undergo hydrolysis, rendering them ineffective; deposits are formed that block the oil passages, preventing proper oil supply. 4. At low temperatures, water reduces the fluidity of lubricating oil and deteriorates its viscosity-temperature properties; at high temperatures, water vaporizes, which not only destroys the oil film but also creates air resistance, affecting the circulation of the lubricating oil. The oil-water mixture detection device can improve the sensitivity and accuracy of detection, while also ensuring precision in measuring the levels of oil and water, thereby enhancing the effectiveness of this device for detecting oil-water mixtures. FRI is a fiber-optic refractive index sensor that provides better and more reliable refractive index measurements for existing applications in the industry; moreover, it offers the additional capability of continuously monitoring the refractive index of fluids under harsh conditions. Such sensors are ideal for measuring the refractive index of fluids in industrial, chemical, and food processing applications. They are also often used to measure oil concentration ratios. For engineers in the instrumentation industry, such field-proven solutions are undoubtedly a valuable asset. A Canadian FISO fiber optic refractometry sensor from Gongcai Network – the FRI – measures the refractive index of fluids with precision by utilizing changes in the length of an etched Fabry-Perot optical cavity. The length of the flush-type Fabry-Perot optical cavity is proportional to the refractive index of the fluid sample. Therefore, by using white light interference technology to measure the length of the Fabry-Perot cavity, the refractive index can be determined. We can provide two models of FRI fiber refractive index sensors: FRI-BA and FRI-NP. The former is a small mini package, while the latter is a robust stainless steel package suitable for industrial applications. Furthermore, the FRI sensor can also operate properly in environments with varying temperatures, EMI, and other conditions. In any application involving fluid chemistry and fluid quality control, including cooling systems, engineers in the aforementioned R&D departments may need to improve processes and product technologies by monitoring the performance of specific characteristics over a period of time. During operation, manufacturing, or throughout the entire life cycle of a product, changes in its specific performance characteristics will be reflected in its refractive index. Using an FRI refractometry sensor, comprehensive refractometry analysis of targets can be carried out in challenging environments. Even in harsh temperature, EMI, humidity conditions, and with variable simple calibration, fiber optic signal conditioners still retain the ability to measure refractive index.