657results about "Weighing by removing component" patented technology

The invention discloses a sealing structure for a test, and an aging test and leakage rate detection method and system. The sealing structure comprises a tested sealing assembly and an air cavity assembly integrated in the tested sealing assembly, and serialized test samples with different filling rates and compression rates are formed by regulating and controlling the groove width and the groove depth of a sealing ring mounting groove so as to simulate various actual sealing states. An aging test adopts a multi-factor coupling accelerated aging method, and a plurality of material characterization means are combined to systematically evaluate the evolution rule of the sealing performance. According to leakage rate detection, static pressure maintaining and dynamic pressure adjusting dual-mode measurement is achieved through an air tightness detector, and the sealing characteristics under different pressure conditions are comprehensively reflected. According to the invention, direct and systematic detection of the leakage rate of the sealing structure is realized, and an innovative solution is provided for sealing performance evaluation and service life prediction of electrical equipment.

The application belongs to the technical field of animal models for basic scientific research, and particularly relates to a method for establishing an acute lung injury animal model, which comprises the following steps: sending a podophyllotoxin or a podophyllotoxin reagent into a rat body through oral administration or intragastric perfusion to obtain the acute lung injury animal model. The method for establishing the acute lung injury animal model provided by the application uses the podophyllotoxin as an inducer for establishing a mouse acute lung injury model, and the mouse can orally take or intragastrically perfuse the podophyllotoxin to achieve the method, without needing a special medicine injection device, so that the method is simple in medicine taking, few in experimental steps, and does not need complex surgical operations.

The invention provides a gold ore phase analysis method, and belongs to the field of mineral analys.The gold ore phase analysis method comprises the steps that a gold ore sample is prepared into ore pulp, the pH value is adjusted to 10-11, ultrasonic cavitation treatment is conducted after polyethylene glycol is added, and limonite turbid liquid and sedimentation bottom mud are obtained through separation; the turbid liquid is subjected to flocculation precipitation, drying, roasting, acid dissolution and impurity removal, and the limonite gold-loaded grade is obtained through the mass difference before and after dissolution and gold concentration determination; separating metal sulfide ore heavy minerals and gangue minerals from the settled bottom mud through artificial heavy elutriation, performing acid dissolution and impurity removal on the metal sulfide heavy minerals, and calculating the gold loading grade of the metal sulfide heavy minerals through mass difference and gold concentration determination; after gangue minerals are subjected to oxidizing roasting, the gold content is measured after concentrated acid dissolution; and calculating the distribution rate of gold based on the result. The gold loading grade and distribution of the limonite phase, the metal sulfide ore phase and the gangue mineral phase are measured in a split-phase mode, the method is highly matched with the gold ore development process, operation is easy and convenient, the result is reliable, and beneficiation and metallurgy technological process formulation and technical index pre-judgment can be effectively served.

The invention relates to the field of heating characteristics of samples, and particularly provides a macro sample temperature jump type in-situ thermal analysis system and a macro sample temperature jump type in-situ thermal analysis method. The system is characterized in that a driving unit is arranged on a guide rail and is suitable for doing vertical movement along the guide rail; the guide rail is perpendicular to the ground; the tubular electric heating reaction unit is connected with the driving unit, and after the tubular electric heating reaction unit is heated to a target temperature, the driving unit drives the tubular electric heating reaction unit to move to the periphery of the sample placing unit, so that a macro sample in the sample placing unit is instantly heated; the accuracy of analyzing the thermogravimetry of macroscopic samples and the precipitation characteristics of volatile matters in simulated industrial application can be improved; the balance measuring unit is connected above the sample placing unit, and the initial position of the tubular electric heating reaction unit is located at the lower end of the guide rail, so that the sample placing unit and the balance measuring unit are kept stable in the process of placing a macroscopic sample into the sample placing unit, and the weighing error during sample weighing and sample reaction is reduced.

The invention relates to a system and a method for measuring the content of free ionomers in high-solid-content catalyst slurry of a fuel cell, and belongs to the technical field of analysis of catalyst slurry of the fuel cell. Separating the catalyst slurry into a supernatant containing free ionomers and a catalyst aggregate precipitate; the filtering device is used for filtering the supernate and removing residual solid particles in the supernate to obtain filtrate; the evaporation device is used for carrying out drying treatment on the filtrate obtained after filtration, and completely evaporating solvent components in the liquid to obtain free ionomer solids; and the weighing device is used for accurately weighing the materials in the centrifuging, filtering and drying processes. Compared with the prior art, the system and the method for measuring the content of the free ionomer in the catalyst slurry of the fuel cell, which are provided by the invention, are accurate in measurement result and wide in applicability through the processes of centrifuging, filtering and drying and accurate weighing.

The invention discloses a method for judging and optimizing a raw material ratio in microwave synergistic pyrolysis, and relates to the technical field of solid waste recycling and biomass energy utilization. In order to overcome the defect that in-depth research and engineering application of a microwave pyrolysis process are restricted in the prior art, the technical scheme provided by the invention comprises the following steps: preparing samples from oily sludge and palm kernel shells according to a preset mass ratio, and mixing to obtain a mixed raw material; establishing an inert atmosphere and forming a controlled reaction system; applying microwave heating and collecting a sample mass change curve and temperature change data; comparing the mass change curve with a theoretical curve formed by weighted stacking of a single raw material pyrolysis curve to obtain a difference result; judging the synergistic effect strength among the raw materials according to the difference result, and outputting a synergistic effect judgment result; and determining an optimal ratio based on a synergistic effect judgment result. The method is suitable for raw material ratio judgment and optimization work of solid waste and biomass under the microwave synergistic pyrolysis condition.

The invention relates to the technical field of soil disintegration measurement, and discloses a test device for a soil disintegration test, which comprises a shell, the outer wall of the shell is rotatably connected with a turntable, the top of the shell is fixedly connected with a suspension rod, the outer wall of the suspension rod is fixedly connected with an iron wire net, and the inner wall of the iron wire net is fixedly connected with a soil taking knife sample. When a cylinder rotates, two balancing weights slide in the direction away from each other, a ball head is extruded to make contact with inclined faces on two spoilers, the two spoilers are extruded to move in the direction away from each other, and the water contact area of the two spoilers and the outer wall of a fixed shell is increased; water is driven to rotate along with the cylinder under the limitation of the flow guide plate, and part of water flow can pass through the flow guide holes in the flow guide plate, so that the rotating speed difference generated by inner and outer water bodies due to instantaneous acceleration of the cylinder is effectively reduced, and then local vortex is generated.

The utility model discloses asphalt mixture gradation rapid intelligent detection equipment which comprises a base and further comprises a detection mechanism, the detection mechanism is arranged at the top of the base, and the detection mechanism comprises a vibration screening machine, a screening box, an insertion groove, an air cylinder A, a vertical rod, a sliding sleeve, a spring, a baffle, a screening plate, an air cylinder B, a movable rod, a tray and a weighing sensor. A vibration screening machine is installed on one side of the top of the base, a screening box is clamped to the top of the vibration screening machine, and inserting grooves are formed in one side of the surface of the screening box. After screening is completed, an air cylinder A is controlled to operate, a screening plate is slowly pulled out, after the screening plate is pulled out by a certain distance, an air cylinder B operates, and a tray is moved to the bottom of the screening plate; the sieve plates can slide down along the vertical rods and fall into the tops of the trays with the asphalt materials, weighing is conducted through the weighing sensors, the weight of the asphalt materials on the tops of all stages of sieve plates can be obtained by subtracting the weight of the sieve plates in the previous no-material state from weighing data, grading detection calculation is completed, and the detection efficiency is improved.

The invention discloses a submarine cable insulating material comprehensive aging evaluation method and system based on a time scaling equivalent axis, and relates to the technical field of submarine cable insulating material aging evaluation. The method aims at solving the problems that equivalent alignment of acceleration and natural aging data cannot be achieved, multi-index evaluation is contradictory, and the evaluation period is long in an existing method. The method comprises the following steps: acquiring a plurality of preset performance parameters of a submarine cable insulation material after an electric-thermal-force multi-physical field accelerated aging test, synthesizing a comprehensive aging index after homodromous mapping and robust standardization processing, establishing equivalent mapping of accelerated and natural service time through a linear scaling coefficient, and calculating the aging index of the submarine cable insulation material according to the equivalent mapping. And a service life evaluation result or reliability warning information is output after consistency checking. According to the technical scheme, the aging state and the service life of the submarine cable insulating material can be accurately and efficiently evaluated, and support is provided for material screening, service life evaluation and safety decision making of submarine cable engineering.

The invention discloses a method for testing the liquid substance content of a battery through staged vacuum heating, and relates to the technical field of battery tests.The method comprises the steps that breaking treatment is conducted on the battery, temperature platforms are started step by step according to the ascending sequence direction of numbers to heat the battery, and in the heating process of each temperature platform, the number of the temperature platforms is increased; carrying out vacuumizing operation according to preset pulse vacuumizing parameters; judging whether the battery quality of the current temperature platform is stable or not according to the current weight loss ratio; if yes, correcting or adjusting according to the weight loss ratio; if so, starting a next temperature platform for heating according to the ascending direction of the numbers to obtain a final battery quality value; and obtaining the liquid substance content of the battery according to the initial mass value and the final mass value of the battery. The method provides guarantee for accurate determination of the liquid substance content of the battery.

The invention discloses a method for measuring the purity of lithium hydroxide based on a gravimetric method, which comprises the following steps: weighing a lithium hydroxide sample, mixing with an organic reagent 1 in batches, and heating to obtain a primary reactant; fully mixing the primary reactant with an organic reagent 2, filtering, collecting filtrate, diluting, adjusting the pH value to 6-6.5, and adding diethyl ether for extraction to obtain a lower-layer lithium chloride solution; adding a precipitant into the solution, reacting under a constant-temperature water bath condition, filtering and drying the obtained filter residue to constant weight, and calculating the purity of the lithium hydroxide according to the constant weight. According to the method, carbonate interference is avoided through the selective organic reagent, the content of the lithium hydroxide is directly measured through the gravimetric method, the detection process is simplified, dependence on operators and large equipment is reduced, the method has the advantages of being high in accuracy, good in repeatability, wide in application range and low in detection cost, and rapid and accurate measurement of the purity of the lithium hydroxide can be achieved.

The utility model discloses a total moisture testing system which comprises a transfer module, a division module, a drying oven weighing module, a rejected sample recycling module, a sample bottle receiving, sending and storing module and a control assembly, the division module is used for dividing a sample in a sample bottle into a test sample and a prepared sample, loading the test sample into a tray, and loading the prepared sample into a bottle; the oven weighing module is used for temporarily storing a sample tray and drying and weighing the sample tray filled with a test sample, and the test sample subjected to constant weight treatment is changed into a rejected sample; the discarded sample recovery module is used for recovering discarded samples and cleaning sample plates; the sample bottle receiving, sending and storing module is used for receiving, sending and storing sample bottles filled with original samples and prepared samples; the transfer module is used for transferring the sample bottles and the sample trays among the stations; the control assembly is used for controlling all the modules to work. The total moisture testing system disclosed by the utility model has the advantages of high automation degree, high testing efficiency, convenience in sample preparation and high testing accuracy.

The invention belongs to the field of cultural relic protection, and relates to a cultural relic surface accessible acidity determination method, which comprises: 1) placing a cultural relic sample using palm leaves as a carrier in a chemical adsorption device, and pre-treating in an inert gas atmosphere; (2) after pretreatment is completed, mixed gas formed by n-butylamine and inert gas is introduced into a chemical adsorption device, and specific chemical adsorption is carried out through the n-butylamine and accessible acid sites on the surface of the cultural relic sample; (3) after adsorption is completed, heating the inner cavity of the chemical adsorption device at a constant rate, desorbing n-butylamine, and recording a desorption signal at the same time; and 4) calculating the acid site concentration according to the desorption signal peak area obtained in the step 3), and determining the acid intensity according to the peak position distribution.The invention provides the cultural relic surface accessible acidity determination method with good specificity and high sensitivity.

This utility model provides an online coal moisture detection device, belonging to the field of raw coal sampling technology. It includes a main body and a robotic arm. The main body has a weighing unit and a drying unit. The drying unit includes an air drying unit and a nitrogen drying unit. The air drying unit is used to dry bituminous coal and anthracite, while the nitrogen drying unit is used to dry lignite. The robotic arm is located on one side of the main body and is used to transfer samples. In use, the main body and robotic arm are configured locally at the coal entering the plant / furnace sampling device. The robotic arm places the sample in the weighing unit of the main body for weighing, and then removes and transfers it to the drying unit. This device is applicable to moisture detection of all coal types, enabling timely detection of coal moisture and guiding coal acceptance, storage, and blending. The online coal moisture detection device provided by this utility model solves the problem of inaccurate moisture detection results in existing automatic sample preparation and analysis systems.

The invention discloses an intelligent detection system for the static evaporation rate of a welded heat insulation gas cylinder based on a weighing method, and relates to the technical field of gas cylinder detection. The core defects that in traditional static evaporation rate detection, manual dependence is high, data are prone to being interfered, and result reliability is low are effectively overcome. Aiming at the problems of low efficiency and operation errors caused by manual copying, synchronous automatic acquisition of quality, environment temperature and atmospheric pressure data is realized, static evaporation rate calculation and inspection report generation are automatically completed based on detected gas cylinder parameters and screened high-quality data, human intervention is remarkably reduced, and the detection efficiency is improved. And the detection efficiency and the flow traceability are improved.

The utility model relates to the technical field of cloth cover detection equipment, in particular to a washable spunlace cloth cover layering detection device which solves the problems that in the prior art, the randomness of detection results is large, and the layering phenomenon of washable spunlace cloth cannot be accurately judged, the washable spunlace cloth cover layering detection device comprises a device body, and a brush assembly is arranged on the device body. A fixing assembly used for fixing the spunlace cloth to be detected is arranged above the brush assembly, and the fixing assembly is arranged on the device body through a lifting assembly. The spunlace detection device has the beneficial effects that the fixing assembly can fix the to-be-detected spunlace, then the distance between the to-be-detected spunlace and the brush assembly can be adjusted through the lifting assembly, the brush assembly rubs the to-be-detected spunlace on the fixing assembly, the brush assembly can brush off the to-be-detected spunlace where the surface of the to-be-detected spunlace is not firmly entangled, and the to-be-detected spunlace is not firmly entangled. Finally, the weight difference of the to-be-detected spunlace cloth before and after testing is used as a quantitative index of the layering phenomenon, and the layering phenomenon can be quantified more accurately.

The invention belongs to the technical field of agricultural product drying, and particularly relates to a jujube slice drying process key quality index prediction method based on multi-source easy-to-measure index fusion. The invention aims to design a key quality index prediction method suitable for a drying process, and provides the key quality index prediction method for the drying process of the jujube slices by establishing a prediction model for important nutritional indexes of the jujube slices in order to solve the problem that the important nutritional indexes of the jujube slices are difficult to monitor in the drying process in the prior art. According to the method, the important nutritional indexes of the jujube slices in the drying process can be quantitatively monitored in real time, the content of different quality indexes of the jujube slices can be rapidly and accurately detected, quantitative data support is provided for optimizing the drying process, the controllability of the drying process and the consistency of product quality are enhanced, and the method has high market application and popularization value.

A method and system for identifying a high-impact polystyrene (HIPS) recycled material are disclosed herein. The method includes: acquiring a HIPS sample (S101); performing sample analysis on the HIPS sample to obtain analysis result data, where the analysis result data include first analysis data representing contents of blending components, second analysis data representing a degradation degree, and third analysis data representing a low-molecular-weight compound, and the sample analysis includes acceleration factor test analysis (S102); comparing the analysis result data with feature data in a HIPS database to determine feature data corresponding to each type of the analysis result data, where the HIPS database is pre-established on the basis of HIPS plastics from various sources (S103); and identifying the HIPS sample according to feature data corresponding to the analysis result data and by a multivariate decision tree algorithm, to determine a recycled material status and a source of the HIPS sample (S104). Rapid and accurate identification of HIPS recycled materials with different content proportions and recycled material sources can be realized.

The invention provides a method for testing choking flow of a freeze dryer, which comprises the following steps of: (1) pumping water with the mass of M1 into a water storage device through a delivery pump, then carrying out freeze-drying treatment, and collecting test data of the freeze dryer in the freeze-drying treatment; (2) after freeze-drying treatment is finished, water in the water storage device is removed through a conveying pump, and the total mass M2 is recorded; and calculating choking flow according to the loss amount of water in the freeze-drying treatment, wherein the choking flow = (M1-M2) / freeze-drying time. The test method provided by the invention is simple in process and convenient to operate, can verify the performance of the freeze dryer, and provides a basis for smooth development of subsequent production work and normal operation of the freeze dryer.

The utility model discloses a variable slope type weighing steel tank, which belongs to the technical field of soil erosion experimental equipment and comprises a soil tank body, a soil tank frame is arranged on the outer side of the soil tank body, one end of the bottom of the soil tank frame is hinged with a middle frame through a rotating shaft, four corners of the bottom of the middle frame are fixedly connected with a lower frame through stand columns, and weighing sensors are mounted on the stand columns. A self-walking mechanism is installed on the lower frame and comprises a driving wheel and a guide wheel, the driving wheel and the guide wheel are installed at the two ends of the lower frame respectively, and the driving wheel is connected with a walking driving motor. According to the variable slope type weighing steel tank, the self-walking mechanism is arranged to achieve movement of the soil tank box body and facilitate position movement, the lifting mechanism can push the soil tank box body to rotate to adjust the inclination angle of the soil tank box body and simulate different slope surfaces, and the weighing sensors are arranged on the stand columns at the joints of the four corners of the bottom of the middle frame and the bottom of the lower frame. The change process of the weight of soil in the soil box body can be measured, and real-time weighing is carried out.

The utility model relates to the technical field of microwave equipment, in particular to a microwave thermogravimetric analyzer which comprises a support frame, a furnace body is arranged in the support frame, the upper end of the furnace body is connected with a furnace cover, and the lower end of the furnace body is connected with a bottom sealing plate; a resonant cavity is formed by the furnace body, the furnace cover and the inner space of the sealing plate, and a magnetron for emitting microwaves into the resonant cavity is arranged on the furnace body; a weighing module is further arranged on the bottom sealing plate, a supporting rod is connected to the weighing module, and a weighing tray used for containing materials is arranged at the upper end of the supporting rod; the weighing module is integrated at the bottom of the resonant cavity, so that microwave heating and real-time weighing are synchronously carried out, the technical problem that traditional microwave equipment cannot monitor material mass change is solved, and accurate data support is provided for reaction kinetics research; meanwhile, the resonant cavity adopts a split type design, and the furnace body is provided with a furnace cover and a bottom sealing plate, so that the weighing module is convenient to install and maintain.

The application discloses a method for evaluating the dissolving performance of soluble material for a fracturing tool. The soluble material sample is put into a clamping sleeve and dissolved in a dissolving solution. A curve is drawn according to the remaining mass of the sample measured in the dissolving process and the dissolving time. The dissolving rate is calculated according to the slope of the straight line segment in the middle part of the curve. The stable dissolving state of the soluble material sample is obtained, so that the dissolving performance of the soluble material is accurately evaluated.

This invention provides a precise method for detecting phosphorus content in high-matrix copper-phosphorus alloys, belonging to the field of chemical analysis technology for metallic materials. The detection method of this invention includes the following steps: S1: Sample pretreatment; S2: Sample dissolution and volume adjustment; S3: Solution pretreatment: Nitric acid, hydrochloric acid, and deionized water are added to the solution and boiled to remove volatile impurities; S4: Precipitation formation: Ammonia water is added to the solution to adjust the pH to 8.5-9.5, and ammonium citrate-EDTA masking agent is added; quinomolybdate-limonene precipitant is slowly added under simmering conditions, and boiling is carried out for 10-15 minutes with intermittent stirring to ensure complete phosphorus precipitation; S5: Filtration, washing, drying, and weighing; S6: Calculation of phosphorus content. Compared with existing technologies, this invention, through a unique combination scheme, suppresses the hydrolysis of copper ions and the interference of coexisting elements, enabling precise detection of phosphorus content in high-matrix copper-phosphorus alloys. It has advantages such as strong resistance to matrix interference, high detection accuracy, good reproducibility, wide applicability, low detection cost, and simple operation.

The present invention provides a method for evaluating a resin composition comprising a resin component and inorganic particles. This method includes determining the residue rate after filtering a mixture containing: a solvent; and a sample that contains the inorganic particles and the resin component.

The application belongs to the technical field of materials, and discloses a special aluminum powder dispersing agent for aluminum foil rolling oil, which is composed of the following components and in the following proportions: base oil: 10-20 parts; surfactant: oleic acid diethanol amide: 40-60 parts; fatty amine polyoxyethylene ether: 10-30 parts; lubricating cleaner: dimer acid: 5-15 parts; and guerbet alcohol: 10-20 parts. The aluminum powder dispersing agent adopts oleic acid diethanol amide and T13 surfactant which have sufficient dispersion effect on aluminum powder, so as to reduce the pollution caused by aluminum powder accumulation after rolling of the aluminum foil; through introduction of the dimer acid and the guerbet alcohol, the lubricating performance of the rolling oil is improved, the oil amount on the surface of the aluminum foil after rolling is reduced, the surface cleanliness of the aluminum foil is improved, and thus the surface leakage coating condition of the aluminum foil is improved.

The invention provides a method for determining the floating content of a binder of a negative plate and application. The method comprises the following steps: acquiring a first weight loss ratio a0 of a negative electrode material at a first position of the negative plate in a target temperature interval; adding the negative electrode material at the first position into a target solvent for reflux, and then filtering and drying to obtain a solid substance; obtaining a second weight loss ratio a1 of the solid substance in the target temperature interval; obtaining a third weight loss ratio x1 of the binder standard substance and a fourth weight loss ratio x3 of the thickener standard substance; obtaining a first actual mass content of the binder based on a0, a1, x1 and x3; and obtaining the floating content of the binder based on the first actual mass content and the designed mass content of the binder. According to the method for determining the floating content of the binder in the negative electrode plate, the actual content of the binder in the negative electrode material at any position in the negative electrode plate can be quantitatively analyzed, and then the floating content of the binder is obtained by combining the design content of the binder.

The invention discloses a method for detecting trace acid-insoluble substances in raw material silicon powder for polycrystalline silicon, and belongs to the technical field of detection of trace acid-insoluble substances in industrial silicon powder, and the method comprises the following steps: placing the whole crucible in a hydrochloric acid solution, and heating and pickling; washing the crucible, placing the crucible on a suction filtration device, and performing suction filtration with high-purity water; the crucible is placed in an electric heating constant-temperature drying box to be dried, and then cooling and weighing are conducted; adding an industrial silicon powder sample into a beaker, and slowly dropwise adding mixed acid of hydrofluoric acid and nitric acid along the wall of the beaker; placing the beaker on a heating plate, heating until the liquid is completely volatilized, and adding a hydrochloric acid solution to completely dissolve the solid salt; transferring the sample into a container, diluting the sample with hot water, and carrying out suction filtration on the sample in a crucible subjected to acid pickling treatment while the sample is hot; and placing the crucible in an electrothermal constant temperature drying box for drying, then placing the crucible in a dryer for cooling to room temperature, and weighing. The method can solve the problem that the trace acid-insoluble substances in the industrial silicon powder cannot be accurately detected, and can be used for detecting the trace acid-insoluble substances in the industrial silicon powder when the trace acid-insoluble substances in the industrial silicon powder are lower than 0.2%.

The invention discloses a method and device for identifying a coal reservoir, and the method comprises the steps: obtaining a coal rock sample of a target interval, and carrying out a thermogravimetric experiment on the coal rock sample; performing image analysis on data obtained by the thermogravimetric experiment to determine a first coal series reservoir; performing thermogravimetric mass spectrometry data analysis on the coal rock sample corresponding to the first coal series reservoir; and determining a final coal reservoir according to a thermogravimetric mass spectrometry data analysis result.

The application provides a method for rapidly distinguishing coal rock sedimentary environment by using ash yield and total sulfur content, comprising the following steps: drawing an ash yield-total sulfur content relationship diagram of coal rock; obtaining ash yield data and total sulfur content data of a coal rock sample to be measured; and explaining the sedimentary environment of the coal rock sample to be measured according to the position area of the ash yield data and the total sulfur content data of the coal rock sample to be measured on the ash yield-total sulfur content relationship diagram. The application distinguishes the sedimentary environment of the coal rock sample to be measured according to the position area of the ash yield data and the total sulfur content data of the coal rock sample to be measured on the ash yield-total sulfur content relationship diagram. The distinguishing method of the application is simple in steps, can clearly and intuitively make an efficient judgment on whether the peat bog type in the coal rock sedimentary environment is affected by marine transgression, the test data is convenient to obtain, is not affected by subjective factors, and the distinguishing result is relatively accurate.

Provided is a moisture meter including a mass measurement unit for measuring the mass of a specimen, a heater for heating the specimen, a control arithmetic unit configured to control the heating unit to heat the specimen until a change in the mass of the specimen becomes not more than a predetermined threshold and calculate the moisture content of the specimen, a timepiece for measuring a heating time, and a storage unit. The control arithmetic unit measures the moisture content of a standard substance for inspection and a heating time, diagnoses the presence / absence of an abnormality in the heating unit by comparing a measured heating time with a predetermined time as a set heating time stored in the storage unit in advance.