JP5461114B2 - Moisture detection device in oil and moisture detection method in oil - Google Patents

Description

  The present invention relates to a water-in-oil detector and a method for detecting water in oil that separate and detect water in a lubricating oil.

  Conventionally, lubricating oil has been used in hydraulic control devices, pumps, engines, pistons, bearings, valves and the like. The lubricating oil contained in these products is circulated and reused, but by circulating the lubricating oil over a long period of time, solids such as metal powder mixed in the lubricating oil when used, Water used for cooling is mixed and accumulated. Prevent the progress of equipment wear, lubrication circulation failure, lubrication performance degradation, lubrication oxidative degradation, equipment corrosion, etc., and maintain the quality and purity of these products. Is important in maintaining the durability of the equipment.

  In order to maintain the quality and purity of the lubricating oil, conventional methods for removing the solid matter mixed in the lubricating oil include, for example, a stationary method and a filtration method. In addition, as a method of removing moisture mixed in the lubricating oil, for example, a stationary method using a specific gravity difference between oil and moisture, a centrifugal separation method, a superheating method, a voltage application method, a method of absorbing in a water absorbing material, and an adsorbing material There are filtration methods.

  Further, as a method of removing solids in the lubricating oil and removing moisture in the oil, for example, the lubricating oil containing solids and moisture is separated into oil and water using a centrifugal separation process, an oil / water separation tank or a gravity settling tank. There is a method of removing a part of solids and moisture by performing treatment with a hydrophobic hollow fiber membrane element after removing a part of solids and moisture by performing the treatment. Large solids such as metal scrap are separated by centrifugal separation, oil / water separation tank or oil / water separation process using gravity sedimentation tank, and small solids such as metal powder are hydrophobic hollow fiber membranes. While separating by the element, the emulsified water is separated by the hydrophobic hollow fiber membrane element to remove the water (see, for example, Patent Document 1).

  Here, when moisture is contained in the lubricating oil, there is a high possibility that equipment damage such as wear and corrosion will occur. Therefore, the moisture content is reduced to 0, for example, before the failure due to moisture in the lubricating oil occurs. It is necessary to detect within a range larger than 2% (for example, see Non-Patent Document 1).

JP-A-2005-904

Japanese Industrial Standard JIS K 2275

  However, the conventional method for removing moisture has a problem in that it takes time to analyze the collected lubricating oil because it is analyzed.

  Therefore, it is necessary to detect moisture in the lubricating oil in a short time and prevent damage to the equipment.

  This invention makes it a subject to provide the water-in-oil detection apparatus and the water-in-oil detection method which can detect the water | moisture content in lubricating oil in a short time in view of the said problem.

A first invention of the present invention for solving the above-described problem is a moisture detector in oil that detects moisture in lubricating oil in a pipe, and is a lubricating oil extraction pipe for extracting the lubricating oil from the pipe. When a heating means for heating the withdrawn lubricating oil, and measuring means for measuring the separated steam by heating the lubricating oil, have a, the additive of the lubricating oil in the lubricating oil withdrawing pipe removed In the oil-in-oil moisture detecting device, the separating means is provided .

According to a second aspect of the present invention, in the first aspect , the lubricating oil circulation line is provided in the lubricating oil extraction pipe and circulates the lubricating oil between the separating means and the heating means upstream of the separating means. And an additive measuring means that is provided between the separating means and an extraction portion for extracting the lubricating oil in the lubricating oil circulation line and measures an additive in the lubricating oil in the lubricating oil extraction pipe. It is in the moisture detection apparatus in oil characterized by this.

A third invention is characterized in that, in the first or second invention, an infrared irradiation device that irradiates infrared rays, a water vapor storage container that stores the water vapor, and a detection unit that detects the irradiated infrared rays. It is in the moisture detector in oil.

A fourth invention is the oil according to the third invention, wherein the infrared rays irradiated from the infrared irradiation device are branched, the wavelength of the branched infrared rays is converted, and the additive in the lubricating oil is measured. In the middle moisture detector.

5th invention is the moisture-in-oil detection method which detects the water | moisture content in the lubricating oil in piping, Comprising: A part of said lubricating oil is extracted from the said piping, the extracted lubricating oil is heated, The said lubricating oil In the method for detecting moisture in oil, the water vapor separated by heating is measured , and the additive in the extracted lubricating oil is removed in advance before heating .

Sixth invention, in the fifth aspect, the after removal of the additive in the lubricating oil, check the solids of the lubricating oil, the case where the solid matter in the lubricating oil is contained, the In the method for detecting moisture in oil, the lubricating oil is extracted before heating the lubricating oil, and the additive in the lubricating oil is removed again.

A seventh invention is characterized in that, in the fifth or sixth invention, the water vapor separated by heating the lubricating oil is irradiated with infrared rays, the irradiated infrared rays are detected, and an infrared absorption spectrum is detected. In the method for detecting moisture in oil.

According to an eighth invention, in any one of the fifth to seventh inventions, a part of the infrared rays used for the measurement of the lubricating oil is branched, and the fine particles in the lubricating oil are simultaneously measured using the branched infrared rays. This is a method for detecting moisture in oil.

  According to the present invention, a small amount of lubricating oil is collected from the inside of the pipe, and the water vapor separated by heating the lubricating oil extracted from the inside of the pipe is measured to detect moisture in the lubricating oil online in a short time. can do. As a result, it is possible to prevent damage due to equipment wear and corrosion.

FIG. 1 is a diagram simply showing the configuration of a first oil-in-water detector according to Embodiment 1 of the present invention. FIG. 2 is a diagram simply showing the configuration of the second oil-in-water detector according to the second embodiment of the present invention. FIG. 3 is a diagram simply illustrating the configuration of the third oil-in-water detector according to the third embodiment of the present invention. FIG. 4 is a diagram schematically showing the configuration of an apparatus for measuring fine particles in lubricating oil. FIG. 5 is a diagram schematically showing a configuration when viewed from a direction orthogonal to the laser irradiated from the measuring apparatus. FIG. 6 is a diagram simply showing a configuration of a fourth oil-in-oil detector according to the fourth embodiment of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

A first oil-in-water detector according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram simply showing the configuration of a first oil-in-water detector according to Embodiment 1 of the present invention.
As shown in FIG. 1, the first oil-in-oil detector 10 </ b> A according to the present embodiment is an oil-in-water detector that detects moisture in the lubricating oil 12 in the pipe 11. Lubricating oil extraction pipe 13 for extracting oil 12, heating device (heating means) 14 for heating the extracted lubricating oil 12, and measuring device (measuring means) for measuring water vapor 15 separated by heating the lubricating oil 12. 16A.

  In the present invention, the lubricating oil refers to a lubricating oil containing moisture. The type of lubricating oil is not particularly limited, and examples thereof include mineral oil, synthetic oil, and vegetable oil.

  A lubricating oil extraction pipe 13 is connected to the pipe 11, and a small amount of lubricating oil 12 flowing in the pipe 11 is extracted to the lubricating oil extraction pipe 13. The extracted lubricating oil 12 is fed to the heating device 14 by the pump P1. The oil amount of the extracted lubricating oil 12 is measured by the flow meter 21, and the lubricating oil 12 extracted from the piping 11 to the lubricating oil extraction tube 13 is adjusted by the control valve V11.

  The lubricating oil 12 extracted to the lubricating oil extraction pipe 13 is fed to the heating device 14. The heating device 14 includes a heating container 14a that contains the lubricating oil 12, and a heater 14b that is provided on the outer periphery of the heating container 14a. The lubricating oil 12 accommodated in the heating container 14a is heated by the heater 14b. The temperature at which the lubricating oil 12 is heated by the heater 14b may be a temperature at which the water in the lubricating oil 12 is evaporated and the lubricating oil 12 is not evaporated. The lubricating oil 12 is preferably heated at 90 ° C. or more and 110 ° C. or less, for example, by the heater 14b, more preferably 95 ° C. or more and 105 ° C. or less, and further more preferably heated at around 100 ° C. This is because, when the lubricating oil 12 is heated at a temperature higher than 110 ° C. by the heater 14b, there is a concern that the sliding surface of the equipment may be worn due to deterioration of the viscosity of the lubricating oil 12 or the like.

  Since the moisture in the lubricating oil 12 can be evaporated by heating the lubricating oil 12 accommodated in the heating container 14a with the heater 14b, the moisture in the lubricating oil 12 is separated from the lubricating oil 12 as water vapor 15. be able to.

The water vapor 15 separated from the lubricating oil 12 by the heating device 14 is extracted from the heating device 14 and supplied to the measuring device 16 </ b> A through the water vapor extraction passage 22. In the measurement apparatus 16A, the measurement is performed using infrared spectroscopy (IR). The measurement device 16A includes an infrared irradiation device 24 that irradiates infrared rays 23, a cell (water vapor storage container) 25 that includes light transmission windows 25a and 25b that store the water vapor 15 that has passed through the water vapor extraction passage 22, and a cell 25. The water vapor 15 is irradiated with an infrared ray 23, the irradiated infrared ray 23 is detected, and a detector 26 that measures the absorption spectrum of the infrared ray 23 is formed.
Infrared rays refer to all electromagnetic waves that have a longer wavelength than red light and a shorter wavelength than millimeter-wave radio waves, and have a wavelength of 0.7 μm or more and 1000 μm or less. In the present invention, infrared rays include those including near infrared rays, middle infrared rays, and far infrared rays.

  Further, in the measuring device 16A, in addition to infrared spectroscopy (IR) for obtaining the absorption spectrum of the infrared ray 23, Fourier transform infrared spectroscopy (FT-IR), light of a specific wavelength is used. You may make it carry out using the laser beam etc. to irradiate.

  The water vapor 15 extracted from the heating container 14 a is fed into the cell 25 through the water vapor extraction passage 22. When the infrared ray 23 is irradiated from the infrared irradiation device 24 toward the water vapor 15 in the cell 25 through the light transmission window 25a, the light having a specific wavelength of the infrared ray 23 caused by the water vapor 15 in the cell 25 is absorbed. The infrared ray 23 that has passed through the light transmission window 25b is applied to the detector 26, and the detector 26 can obtain an infrared absorption spectrum caused by water molecules.

  Therefore, by collecting a small amount of the lubricating oil 12 from the pipe 11 and measuring it using the water vapor 15 separated by heating the lubricating oil 12 extracted from the pipe 11, the moisture in the lubricating oil 12 is online. It can be detected in a short time.

  Further, the lubricating oil 12 from which the water vapor 15 has been separated by the heating device 14 is discharged from the heating device 14, passes through the lubricating oil supply pipe 27, and is returned to the pipe 11. The amount of the lubricating oil 12 returned from the lubricating oil extraction pipe 13 to the pipe 11 is adjusted by the control valve V12.

  As described above, according to the first oil-in-water detector 10A according to the present embodiment, the water in the lubricating oil 12 can be analyzed in a short time online using a small amount of the collected lubricating oil 12. Therefore, the moisture in the lubricating oil 12 can prevent the equipment from being damaged due to wear or corrosion.

  Further, as the lubricating oil used in the first oil-in-water detector 10A according to the present embodiment, for example, lubrication that is circulated and used in a rolling roller bearing portion, a seal bearing, or the like in a steel mill or a non-ferrous rolling process. Oil, lubricating oil that is sprayed and collected between the workpiece and rolling roller, but is not limited to this, used for hydraulic control devices, pumps, engines, pistons, bearings, valves, etc. It can also be used for lubricating oil.

A second oil-in-water detector according to Embodiment 2 of the present invention will be described with reference to the drawings. In addition, about the member which overlaps with the structure of the water-in-oil detection apparatus which concerns on Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 2 is a diagram simply showing the configuration of the second oil-in-water detector according to the second embodiment of the present invention.
As shown in FIG. 2, the second oil-in-water detector 10B according to the present embodiment is a lubricating oil extraction pipe 13 of the first oil-in-water detector 10A according to the first embodiment of the present invention shown in FIG. In addition, a filter 31 is provided as a separating means for removing the additive in the lubricating oil 12.

  In the present invention, the lubricating oil refers to a lubricating oil containing moisture, but also includes a lubricating oil further containing impurities as a contaminant. Contaminants are mixed by using lubricating oil in equipment and the like, and include, for example, soot, oxides, nitrated products, sulfurized products, fuel residues, water, glycol contaminants, and deteriorated lubricating oils. In addition, solid materials are also included as additives. Examples of the solid material include metal scraps such as iron scraps and non-ferrous metal scraps, paints, resins, metal powders such as iron powders and non-ferrous metal powders, and various dusts such as sand and dust.

  The lubricating oil 12 extracted from the piping 11 to the lubricating oil extraction pipe 13 is fed to the filter 31, and the additive contained in the lubricating oil 12 is removed in the filter 31. In the filter 31, an additive having a particle size in the lubricating oil 12 of, for example, 1 μm or more and 5 μm or less can be removed. The particle size of the additive present in the lubricating oil 12 is mostly in the range of 1 μm or more and 100 μm or less, and the particle size of the additive present most in the lubricating oil 12 is in the range of 1 μm or more and 5 μm or less. It is.

  As the filter 31, for example, a cartridge filter, a depth filter, a surface filter, a screen filter, or the like is used. Moreover, although the filter 31 is used as a separating means for removing the additive in the lubricating oil 12, the present invention is not limited to this, and the lubricating oil 12 and the additive such as a centrifuge can be separated. Anything is acceptable.

  Therefore, by providing the filter 31 in the lubricating oil extraction pipe 13, the additive in the lubricating oil 12 can be removed in advance before the lubricating oil 12 is fed to the heating device 14. Only 12 can be heated. Thereby, when measuring the water vapor 15 separated from the lubricating oil 12, it is possible to prevent the additive separated from the lubricating oil 12 from being accompanied by the water vapor 15 and fed into the cell 25. When performing the measurement, the noise of the infrared absorption spectrum due to the additive in the lubricating oil 12 can be removed, and the measurement accuracy of the water vapor 15 can be improved.

  Therefore, according to the second oil-in-water detector 10B according to the present embodiment, the moisture in the lubricating oil 12 containing the additive is measured by removing the additive in the lubricating oil 12 in advance. Compared to the above, the analysis accuracy of moisture in the lubricating oil 12 can be improved, so that the moisture in the lubricating oil 12 can be analyzed with higher accuracy.

A moisture detector in oil according to a third embodiment of the present invention will be described with reference to the drawings. In addition, about the member which overlaps with the structure of the moisture-in-oil detection apparatus which concerns on Example 1 and Example 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 3 is a diagram simply showing the configuration of a third oil-in-oil detector according to Embodiment 3 of the present invention, and FIG. 4 schematically shows the configuration of a device that measures fine particles in lubricating oil. FIG. 5 is a diagram schematically showing a configuration when viewed from a direction orthogonal to the laser irradiated from the measuring apparatus.
As shown in FIG. 3, the third oil-in-water detector 10C according to the present embodiment is a lubricating oil extraction pipe 13 of the second oil-in-water detector 10B according to the second embodiment of the present invention shown in FIG. A lubricating oil circulation line 32 that circulates the lubricating oil 12 between the filter 31 and the heating device 14 upstream of the filter 31, and an extraction portion 32 a that extracts the lubricating oil 12 of the filter 31 and the lubricating oil circulation line 32. And an additive measuring device (additive measuring means) 33 for measuring an additive in the lubricating oil 12 in the lubricating oil extraction pipe 13.

  The additive measuring device 33 includes a laser beam irradiation device 35 that irradiates a laser beam 34, a beam damper 36 that blocks the laser beam 34 that has passed through the lubricant extraction pipe 13, and a detector 37 that detects the laser beam 34. Has been. As shown in FIG. 4, the lubricating oil extraction pipe 13 is provided with windows 38 and 39 through which the laser beam 34 irradiated from the laser beam irradiation device 35 can pass. Further, as shown in FIG. 5, the lubricating oil extraction pipe 13 is provided with a window 40 that is provided between the lubricating oil extraction pipe 13 and the detector 37 and is capable of transmitting laser light 34.

  As the laser beam 34 irradiated from the laser beam irradiation device 35, a He—Ne laser having a wavelength of 633 nm using a mixed gas of helium (He) and neon (Ne) is used. The laser beam 34 used is not particularly limited to a He—Ne laser, and other laser beams may be used.

  When the laser light 34 is irradiated from the laser light irradiation device 35 toward the lubricating oil 12 in the lubricating oil extraction pipe 13, the laser light 34 is extracted when no additive is mixed in the lubricating oil 12. The light passes through the tube 13 and is shielded by the beam damper 36. On the other hand, when the additive is mixed in the lubricating oil 12, the laser beam 34 is scattered by colliding with the additive. Therefore, the more additives are contained in the lubricating oil 12, the greater the degree of scattering of the laser light 34. For this reason, the content ratio of the additive in the lubricating oil 12 can be confirmed by measuring the degree of scattering of the laser beam 34.

  When it is confirmed by the additive measuring device 33 that the additive is contained in the lubricating oil 12, the lubricating oil 12 is extracted from the lubricating oil circulation line 32. The lubricating oil circulation line 32 is provided with a filter 41 that removes additives in the lubricating oil 12. The lubricating oil 12 extracted to the lubricating oil circulation line 32 removes the additive in the lubricating oil 12 by the filter 41 and returns it to the lubricating oil extraction pipe 13. At this time, the control valve V13 is closed and the control valve V14 is opened. Then, the additive in the lubricating oil 12 is removed again by the filter 31, and whether the additive is contained in the lubricating oil 12 is similarly measured by the additive measuring device 33. When it is confirmed by the additive measuring device 33 that no additive is contained in the lubricating oil 12, the lubricating oil 12 is fed to the heating device. At this time, the control valve V13 is opened and the control valve V14 is closed.

  Therefore, by confirming the additive in the lubricating oil 12 by the additive measuring device 33 before feeding the lubricating oil 12 to the heating device 14, the lubricating oil 12 containing no additive is added to the heating device 14. It can be supplied stably.

  As described above, according to the third oil-in-water detector 10C according to the present embodiment, the additive measuring device 33 confirms the removal efficiency of additives such as solids in the lubricating oil 12, and the lubricating oil circulation line 32. Is circulated until the additive in the lubricating oil 12 is removed, and the additive in the lubricating oil 12 is removed in advance before the lubricating oil 12 is fed to the heating device 14. Can be stably fed and heated. Thereby, when measuring the water vapor 15 separated from the lubricating oil 12, it is possible to reliably prevent the additive from being accompanied in the water vapor 15 and fed into the cell 25, so that the water vapor 15 is analyzed. At this time, noise caused by the additive in the lubricating oil 12 can be removed. For this reason, the analysis accuracy of moisture in the lubricating oil 12 can be further improved.

A moisture detector in oil according to a fourth embodiment of the present invention will be described with reference to the drawings. In addition, about the member which overlaps with the structure of the water-in-oil detection apparatus which concerns on Example 1 thru | or Example 3, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 6 is a diagram simply showing a configuration of a fourth oil-in-oil detector according to the fourth embodiment of the present invention.
As shown in FIG. 6, the fourth oil-in-oil detector 10 </ b> D according to the present embodiment branches the infrared ray 23 irradiated from the infrared irradiation device 24, and uses the branched infrared ray 23 to add in the lubricating oil 12. It is for measuring objects.
That is, the measuring device 16B of the fourth oil-in-oil detector 10D according to the present embodiment includes a half mirror 42 that branches the infrared ray 23 irradiated from the infrared irradiation device 24 between the infrared irradiation device 24 and the cell 25. It is provided.

  Infrared rays 23 are irradiated from the infrared irradiation device 24 and split by the half mirror 42. The spectroscopic infrared rays 23 </ b> A are used for measuring additives in the lubricating oil 12, and the infrared rays 23 </ b> B that have passed through the half mirror 42 are used for measuring moisture in the lubricating oil 12.

  The infrared light 23 </ b> A is wavelength-converted by the wavelength conversion device 43. When the infrared ray 23 irradiated from the infrared irradiation device 24 is, for example, light having a wavelength of 1064 nm, the infrared ray 23 </ b> A is converted into a laser beam 44 having a wavelength of 532 nm by the wavelength conversion device 43. The infrared ray 23A is converted into a laser beam 44 having a wavelength of 532 nm by the wavelength converter 43, then reflected by the reflector 45 and applied to the lubricating oil 12 in the lubricating oil extraction pipe 13. The laser beam 44 scattered by the additive in the lubricating oil 12 is irradiated to the detector 46, and the additive in the lubricating oil 12 is confirmed.

  The wavelength conversion device 43 includes a nonlinear optical crystal, and converts the wavelength of the infrared ray 23A by irradiating the nonlinear optical crystal with the infrared ray 23A. As a crystal material of the nonlinear optical crystal, for example, a KTP crystal is used.

  As the detector 46, for example, a photomultiplier tube (PMT), a photodiode (photodiode: PD), or the like is used.

  Further, as shown in FIG. 6, the infrared rays 23 </ b> B dispersed by the half mirror 42 are irradiated into the cell 25 and the moisture in the lubricating oil 12 is measured.

  Therefore, according to the fourth oil-in-moisture detection device 10D according to the present embodiment, the half-mirror 42 divides the infrared rays 23 emitted from the infrared irradiation device 24, whereby the lubricating oil 12 in the cell 25, The lubricating oil 12 in the lubricating oil extraction pipe 13 can be irradiated simultaneously. For this reason, since the measurement of the water | moisture content in the lubricating oil 12 and the measurement of the presence or absence of the additive of the lubricating oil 12 in the lubricating oil extraction pipe | tube 13 can be performed simultaneously with one infrared irradiation apparatus 24, the structure of an apparatus Can be simplified.

  Further, in the fourth oil-in-water detector 10D according to the present embodiment, when the infrared ray 23 irradiated from the infrared irradiation device 24 is light having a wavelength of, for example, 1064 nm, the infrared ray 23A is wavelength-converted to 532 nm and lubricated. Although the additive in the oil 12 is measured, the present invention is not limited to light having a wavelength of 532 nm, and the lubricating oil is used for light in other wavelength regions and light in other wavelength regions in visible light. 12 may be used for the measurement of the additive.

  In the fourth oil-in-oil detector 10D according to the present embodiment, one wavelength converter 43 is provided in the optical path of the infrared ray 23A. However, the present invention is not limited to this. A plurality of wavelength conversion devices may be provided in the optical path of the infrared ray 23A.

  The above is a description of the device for measuring moisture in the lubricating oil flowing from the inside of the pipe as the moisture detecting device in oil of the present invention. However, the present invention is not limited to this, and other devices than the lubricating oil can be used. The present invention can also be applied to an apparatus for analyzing water in a solution.

  As described above, the moisture detector in oil according to the present invention can measure the moisture content in the lubricating oil online in a short time, and is suitable for use in determining the measurement of moisture in the lubricating oil. ing.

10A to 10D 1st oil moisture detecting device to 4th oil moisture detecting device 11 Piping 12 Lubricating oil 13 Lubricating oil outlet tube 14 Heating device (heating means)
14a Heating container 14b Heater 15 Water vapor 16A, 16B Measuring device (measuring means)
21 Flowmeter 22 Steam Extraction Passage 23 Infrared 24 Infrared Irradiation Device (Irradiation Device)
25 cell 26 detector 27 lubricating oil supply pipe 31 filter (separation means)
32 Lubricating oil circulation line 32a Extraction part 33 Additive measuring device (additive measuring means)
34 Laser light 35 Laser light irradiation device 36 Beam damper 37 Detector 38-40 Window 41 Filter 42 Half mirror 44 Laser light 45 Reflector 46 Detector V11-V14 Control valve

Claims (8)

A device for detecting moisture in oil that detects moisture in lubricating oil in piping,
A lubricating oil extraction pipe for extracting the lubricating oil from the pipe;
Heating means for heating the extracted lubricating oil;
A measuring means for measuring water vapor separated by heating the lubricating oil;
I have a,
The oil-in-oil moisture detecting device is characterized in that a separation means for removing the additive in the lubricating oil is provided in the lubricating oil extraction pipe . In claim 1 ,
A lubricating oil circulation line that is provided in the lubricating oil extraction pipe and circulates the lubricating oil between the separating means and the heating means upstream of the separating means;
An additive measuring means provided between the separating means and an extraction portion for extracting the lubricating oil in the lubricating oil circulation line, and measuring an additive in the lubricating oil in the lubricating oil extraction pipe;
A device for detecting moisture in oil, comprising: In claim 1 or 2 ,
The water-in-oil detector according to claim 1, wherein the measuring means includes an infrared irradiation device that irradiates infrared rays, a water vapor storage container that stores the water vapor, and a detection unit that detects the irradiated infrared rays. In claim 3 ,
A water-in-oil detector that branches the infrared rays emitted from the infrared irradiation device, converts the wavelength of the branched infrared rays, and measures the additive in the lubricating oil. A method for detecting moisture in oil that detects moisture in lubricating oil in a pipe,
Withdrawing a part of the lubricating oil from within the pipe, heating the extracted lubricating oil, measuring the water vapor separated by heating the lubricating oil ,
A method for detecting moisture in oil, wherein the additive in the extracted lubricating oil is removed in advance before heating . In claim 5 ,
After removing the additive in the lubricating oil, check the solids in the lubricating oil, and if the lubricating oil contains solids, extract the lubricating oil before heating the lubricating oil The method for detecting moisture in oil, wherein the additive in the lubricating oil is removed again. In claim 5 or 6 ,
A method for detecting moisture in oil comprising irradiating water vapor separated by heating the lubricating oil with infrared rays, detecting the irradiated infrared rays, and detecting an absorption spectrum of the infrared rays. In any one of Claims 5 thru | or 7 ,
A method for detecting moisture in oil, wherein a part of infrared rays used for measurement of the lubricating oil is branched, and fine particles in the lubricating oil are also measured simultaneously using the branched infrared rays.

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