975results about How to "The measurement result is accurate" patented technology

The invention discloses a measuring method of biochemical oxygen demand and a BOD sensor and applications. The measuring method comprises the following steps of: constructing a unilocular air cathode no-amboceptor microbial fuel cell, adding a sample into the microbial fuel cell; measuring output voltage generated by the microbial fuel cell and calculating electrical quantity value; and substituting the electrical quantity value into a liner equation and calculating the BOD value and the like. The invention provides the specific BOD sensor and applications thereof for implementing the method; the lowest detection limit of the measuring method is 0.2mg / L, the measuring range of BOD is 5 to 50mg / L, and the relative error with the detection result of a culture method at the temperature of 20 plus or minus 1 DEG C for 5 days is less than 4.0%. The invention has simple and programmable operation process, stable and fast measuring process, can realize online detection, has low cost and is suitable for promotion and application commonly.

The invention belongs to the field of chemistry and is suitable for measuring the harmful elements of lead, arsenic, cadmium, copper and chromium in a eucalyptus oil food additive. The measuring method comprises the following steps of: firstly, quantitatively splitting a sample of the eucalyptus oil food additive and placing the sample into a polytetrafluoroethylene digester of a microwave digestion instrument; secondly, digesting the sample by adding 40-50mL of nitric acid-peroxide into each 10mL of the sample of the eucalyptus oil food additive; thirdly, taking off a sample solution to cool, release pressure and discharge waste gas and adding ultrapure water to 50mL; fourthly, using 4 percent nitric acid to dilute lead, arsenic, cadmium, copper and chromium of a national standard stock solution (GBW) into standard solution mixing liquid with concentrations of 0.00microgram / L, 2.50microgram / L, 5.00microgram / L, 10.00microgram / L, 20.00microgram / L and 30.00microgram / L step by step, measuring ion abundance by using an ICP-MS (Inductively Coupled Plasma-Mass Spectroscopy) instrument, and with the concentrations as traverse coordinate and the ion abundance as longitudinal coordinate, automatically drawing an element calibration curve by a computer; and fifthly, measuring the ion abundance of the lead, the arsenic, the cadmium, the copper and the chromium in the sample solution of the third step and calculating the content of each element.

The invention provides an earth mass stillness lateral-compression coefficient determinator which comprises a pressure chamber, a loading device and a measurement control device, wherein the loading device is arranged on the top or bottom of the pressure chamber; the pressure chamber comprises a base, a bottom plate and a supporting pad which are arranged on the base, a sample drum arranged on the supporting pad, an upper pressure plate matched with the top opening of the sample drum, and a pressurization cover plate and a loading sensor which are successively arranged on the upper pressure plate from top to bottom; the bottom plate is a rounded bottom plate composed of two hemicycle metal plates with same semidiameter, and the sample drum is composed of two semicircle drums on the outer side wall of the sample drum and is connected with the two semicircle drums through at least two pairs of pull pressure sensors; the upper pressure plate is composed of a hemicycle metal plate; and the signal interface of a measurement control device is respectively connected with the loading device, the loading sensor and the pull pressure sensor, the measurement control device outputs a signal to the loading device, and the loading sensor and the pull pressure sensor output signals to the measurement control device. The determinator provided by the invention has the advantages of simple structure and wide application range.

The invention discloses a method for simultaneously determining harmful elements in iron ore. The method comprises the following steps of: processing a sample through microwave digestion; under optimized instrument working conditions, drawing a standard curve by a standard addition method to correct the matrix effect; and simultaneously determining the harmful elements including sodium, potassium, lead and zinc in the iron ore by use of an inductive coupling plasma mass spectrometer. Through the invention, the problems of complicated operation and processing steps, low sensitivity, low stability, poor reproducibility and the like in the former determining process are solved; and the method disclosed by the invention has the characteristics of fast determination, high sensitivity and accurate result, and is favorable for environmental protection and human health.

The invention relates to a method for detecting a selenium form, elemental selenium and total selenium. Chromatographic separation systems and atomic fluorescence spectrophotometers in different instrument manufacturers are combined into a HPLC-HG-AFS system, and a method for analyzing the selenium form and measuring elemental selenium and inorganic selenium and total selenium in a sample can be performed. The measurement result is accurate; by measurement on the total selenium and inorganic selenium, the content of organic selenium can be indirectly obtained by adopting a method of subtracting the inorganic selenium from the total selenium, and a new technology for measuring the total selenium, inorganic selenium and organic selenium through a form analysis method can be formed. The method is high in portability and convenient and flexible to use and has high popularization and application values.

The present invention is continuous drilling flow rate capable of predicting coal draft outburst and its apparatus. By means of the method of drilling holes in the coal bed drilling direction for data acquisition and the apparatus comprising hole sealing capsule unit, solid-gas separator, filter, coal bit controller, electric rock drill with connected displacement sensor LXC, controller unit KZ with explosion resistant enclosure and connected computer data acquisitor SC, the present invention can determine the gas distribution in the drilling direction, obtain the gas flow rate distribution curve along the drilling depth during coal bed drilling process, so as to determine the distance of soft coal containing high pressure gas to the ground, judge the distance to the place with maybe outburst. The present invention has compact reasonable structure, high accuracy and stable and reliable measurement result, and may be used widely.

The invention discloses a method for measuring hyperpressure of flammable gas explosion shock waves. The method includes placing a horizontal track device in an explosion case; arranging a spherical reference object on horizontal tracks; filling flammable gas with certain concentration into the explosion case; igniting the gas; recording a dynamic process of explosion of the flammable gas by a high-speed camera; analyzing via ProAnalyst kinetic analysis software to obtain acceleration of the spherical reference object under the action of the shock waves; and measuring the hyperpressure of the flammable gas explosion shock waves by using the Newton's second law. The Newton's second law and the characteristic of high-speed analysis of the high-speed cameral are sufficiently utilized, so that the hyperpressure of the flammable gas explosion shock waves is measured via physical principles, and the method has an important guiding significance for preventing and controlling actual flammable gas explosion disasters. Besides, the method has the advantages that a device is simple in structure, operation steps are simple, a measurement result is visible and precise, and closely reflects the actual condition, and the method is easy to popularize.

The invention discloses an air chamber for automatically measuring soil respiration, which belongs to the field of ecological research. The air chamber for automatic measurement of soil respiration is composed of an automatic opening device, a base, a measuring chamber and the like. It is driven by a small DC motor placed on the base to realize timing opening and closing during measurement. The measurement chamber consists of a hollow shell, which is divided into upper and lower parts. A temperature probe can be installed in the top center of the upper part of the shell to measure the temperature in the gas chamber. The two sides of the top inside the shell are provided with ventilation ports that communicate with the infrared gas analyzer. The upper part of the shell is equipped with a copper tube with holes; the lower part of the shell is buried in the soil, and the airtightness is realized by the plastic rubber ring when the upper and lower shells are closed; the air chamber for automatic measurement of soil respiration in the present invention can be used for infrared gas analysis. The instrument provides an analytical gas source to calculate the soil respiration rate; it can quickly provide multi-point measurements.

The invention discloses a clothes treating method and device. The method comprises the steps that after a clothes washing task is finished, whether clothes placed in a washing tub is taken out or not is determined; when it is determined that the washed clothes is not taken out and the placement time of the washed clothes exceeds a preset time duration, preset clothes drying operation is executed. According to the clothes treating method and device, after the clothes washing task is finished, whether the clothes is taken out of the washing tub or not is determined; when it is determined that the washed clothes is not taken out and the placement time of the washed clothes is too long, a washing machine automatically executes drying operation to dry the clothes, and therefore the defect that clothes is smelly after being placed for a long time in the related technologies is overcome. By means of the clothes treating method and device, the intelligent level of the washing machine can be improved, and the clothes treating process is more intelligent.

The invention relates to a method for simply, conveniently and accurately measuring the contents of ferrous, ferric iron and total iron in seawater by utilizing a spectroscopic luminosity technology. The method comprises the following steps: fixing the ferrous and ferric iron in seawater sample, regulating the PH to slant acidity; taking ferrozine mono-sodium salt as a color reagent, setting the absorbance of a blank control solution the salinity and the PH of which are consistent with the seawater sample to be zero, and then measuring the absorbance of a standard solution and the seawater sample; adding a hydroxylamine hydrochloride solution into the blank solution, the standard solution and the seawater sample to completely reduce the ferric iron in the seawater, adding an ammonium acetate buffer solution, setting the absorbance of the blank control solution to be zero, and measuring the absorbance of the standard solution and the seawater sample; repeating the step of reduction, adding ammonium acetate buffer solution, setting the absorbance of the blank control solution to be zero, and measuring the absorbance of the standard solution for the third time; and finally, calculating the contents of the ferrous, the ferric iron and the total iron in the seawater sample, thus the problem of application restriction of the spectroscopic luminosity technology in measuring the content of iron in the seawater is solved.

This invention belongs to the luminous flux measurement field, and especially relates to the equipment and method for LED's total luminous flux measurement with a narrow beam standard light source. The system for LED's total luminous flux measurement with a narrow beam standard light source in this invention comprises an integrating sphere, the light source, a narrow aperture fiber, a spectrometer and a driver for the light source. The light source is lighted by the driver. The narrow beam standard light source (both luminous flux standard and spectrum standard) is placed on the interior surface of integrating sphere, there is not any baffle in the sphere, and a narrow aperture fiber transfers the light to a multi-channel spectrometer which measures the spectrum distribution of LED and calculates its total luminous flux. The equipment in this invention is easy to use, has small error and low cost, and can achieve accurate results for LED's total luminous flux.

The invention relates to a method of mensurating steel residual stress using X rays, comprising: (1) taking a galvanized sheet, polishing smooth surface layers; taking saturated NaCl aqueous solution as electrolyte, using measured components as anode corrosion ends, using galvanized sheet iron as a cathode, eroding by DC constant pressure, corrosion current being 7-8 A; (2) after corrosion cleavage, mensurating residual stress on vertical direction of welding using X rays, then correcting residual stress measurement value after cleavage using single side cleavage measurement stress value correction method, namely obtaining steel residual stress. According to the inventive method to measurate the steel residual stress, novel additional stress is not increased by electrolytic corrosion cleavage, also measurement result along heavy gauge workpieces is obtained, measurement result is simple, device cost is low.

The invention provides an analyzing method for simultaneously determining residues of organophosphorus pesticides and pyrethriods pesticides in soil. The analyzing method is characterized by comprising the following steps: carrying out ultrasonic extraction on a soil test sample by using an acetonitrile solution containing 1% of acetic acid by volume percent; purifying by using a suitable amount of PSA and C18 mixed fillers; blowing liquid supernatant by nitrogen and concentrating until the liquid supernatant is nearly dried; respectively dissolving by acetone and n-hexane and enabling the volume to be constant; raising the temperature by using DB-1701 and HP-5 quartz capillary columns and separating; carrying out GC / FPD (Gas Chromatograph / Flame Photometric Detector) detection and GC / micro ECD (Electron Capture Detector) detection; and finally, quantifying by using a base material external standard method. A test confirms that the method has a wide linear range; the technical indexes including detection sensitivity, accuracy and precision meet the requirements of a residue analysis; the pre-treatment operation is simple, convenient and rapid and a reliable manner is provided for analytical researches for simultaneously determining the residues of ths pesticides and the pyrethriods pesticides in the soil.e organophosphoru.

The invention discloses a method for measuring the equivalent salt density and the ash density of a cluster parachute surface of a composite insulator. The method is characterized by comprising the following steps of: cleaning a foul layer on the cluster parachute surface by distilled water serving as a cleaning solution, and respectively measuring the equivalent salt density ESDD1 and the ash density NSDD1 of sewage obtained by cleaning by the distilled water; then cleaning a stubborn foul layer on the cluster parachute surface by an organic solvent serving as a cleaning solution, and respectively measuring the equivalent salt density ESDD2 and the ash density NSDD2 of sewage obtained by cleaning by the organic solvent; and taking sums of the twice measured results as the equivalent salt density and the ash density of the cluster parachute surface of the composite insulator. According to the method, the measured result can accurately represent the actual sewage accumulation condition of the surface of the composite insulator; accurate reference data are supplied to analysis of a pollution condition of a running environment and judgment of external insulation fouls of a power grid.

The invention discloses a method for detecting the content of nicotine in smoke of an electronic cigarette. The detection method comprises the following steps: (1) preparing an extracting agent; (2) preparing a standard series solution of the nicotine; (3) connecting a Cambridge filter and an absorption bottle with a smoking machine in series and capturing the smoke of the electronic cigarette; putting the Cambridge filter for capturing the smoke and absorption liquid into a tapered bottle and carrying out vibration extraction; (4) moving away an extracting liquid filtering membrane and analyzing filter liquid by using a gas chromatographic method; and (5) drawing a standard curve and calculating the content of the nicotine in the smoke of the electronic cigarette. The method disclosed by the invention has the advantages of high sensitivity, good selectivity, simplicity in operation and high repeatability, and can realize the accurate quantitative analysis of the nicotine in the electronic cigarette.

The invention belongs to a measuring method of divalent cobalt content in lithium cobalt oxide in the metallic ion quantitative detection field; the measuring method is characterized in that: total cobalt content and trivalent cobalt ion content in the lithium cobalt oxide are respectively measured, and then the total cobalt content subtracts the trivalent cobalt ion content for obtaining the divalent cobalt content in lithium cobalt oxide; wherein, the measuring method of the total cobalt content in the lithium cobalt oxide adopts ethylenediamine tetraacetic acid (EDTA) chelatometrie volumetric method, an iodometry method or a potassium ferricyanide oxidimetry method, and the measuring method of the trivalent cobalt ion content in the lithium cobalt oxide adopts an ammonium ferrous sulfate oxidimetry method. The measuring method in the invention makes up the disadvantage that the prior art has no measuring method of divalent cobalt content in lithium cobalt oxide and provides a measuring method of divalent cobalt content in lithium cobalt oxide in the metallic, wherein the method has simple operation, easy judgment of a finishing point and accurate measuring result, thereby providing powerful reference for judging the purity of the lithium cobalt oxide products and ensuring the lithium cobalt oxide products to have good electro-chemical performance.

A method for detecting the As in food, health-care food, or biological specimen includes dissolving the specimen in nitric acid and hydrogenperoxide mixture under action of microwave, adding the mixed solution of 150 g / L thiourea and 100g / L VC, mixing, taking 25ml solution laying aside at orinary temp for 40-50 min, and atomic spectrofluorimetry. Its advantages are high speed, correctness and sensitivity.

The invention discloses a method for testing dual-wavelength of light splitting luminosity. The method comprises the following steps of: preparing liquid to be tested and corresponding standard solution; selecting a corresponding largest absorbance as the testing wavelength; making a standard curve and a working curve of an object to be tested and an interference object; and calculating the content of the object to be tested according to an object (to be tested) content absorbance working curve regression equation that m is equal to KdeltaA+b. The method is strong in anti-interference capability, mutual interference of two components is eliminated, and the testing result is accurate; an absorbance calculation equation adopted is as follows: delta=A1-s2A2-t2; as the absorbance generated by the interference object is A1-s2A2-t2=0, the interference is eliminated, and the testing result is accurate; the method is simple and convenient, complex separation does not need to be carried out on two components which develop the color at the same time, so that the time, the labor and the agent are saved; two substances can be tested at the same time, and particularly the method has remarkable advantages for two components which are hard to be separated or cannot be separated; the method is applicable to more substances, and the method can be adopted only if the calculated deltaA is large enough, so that more substances can be tested with the attendance of a single interference object by using double wavelength.

The invention discloses a method for measuring and calculating system battery electricity quantity. The method comprises the following steps that: step one, a reference voltage of a battery is obtained by using an ADC battery voltage measurement method, and preferably, 10 times of successive AD conversion is performed, an average value of conversion results is selected, such that the reference voltage can be obtained; step two, the compensation voltage of each main power consumption device is calculated according to the states of the main power consumption devices of a system; step three, the sum of the reference voltage and the compensation voltage of the main power consumption devices is calculated and is adopted as post-compensation voltage; step four, corresponding electricity quantity is obtained through a voltage-electricity quantity relationship according to the post-compensation voltage, and the corresponding electricity quantity is adopted as measured electricity quantity; and step five, currently displayed electricity quantity of the battery is updated with the measured electricity quantity of the battery. With the method for measuring and calculating the system battery electricity quantity of the invention adopted, under the premise that current information is unavailable, a method in which ADC voltage is adopted to measure the electricity quantity of the battery is only utilized, and the method and algorithms are improved, and therefore, measurement accuracy is greatly increased, and the charge and discharge curves of the battery are more approximate to authentic situations.

The invention discloses an analytical method of simultaneously measuring the residues of organophosphorus pesticide and pyrethriods pesticide in fresh leaves. The analytical method is characterized in that performing supersonic extraction on a tea fresh leaf sample by using an acetonitrile solution with the volume fraction of acetic acid being 1%, purifying by a proper amount of a PSA,C18 and GSB mixing padding, performing nitrogen blowing concentration on supernatant liquid to be almost dried, making up to volume by acetone and normal hexane, performing heating separation by DB-1701 and HP-5 quartz capillary columns, detecting GC / FPD and GC / muECD, and finally performing quantitative measuring by adopting a basic external standard method. Tests show that a linearity range is wide through, technical indexes such as detection sensitivity, accuracy and precision all meet requirements of residue analysis, the pretreatment operation is simple, convenient and rapid, and reliable methods are provided for analytical investigation of simultaneously measuring the residues of the organophosphorus pesticide and pyrethriods pesticide.

The invention relates to a method for testing the content of mercury in tipping paper for cigarette, which comprises using 3% hydrochloric acid to do constant volume to a certain volume after a tipper paper sample for cigarette is digested by mixed acid, utilizing sodium borohydride which contains sodium hydroxide to be reducing agent in the environment of strong acid-hydrochloric acid, deacidizing mercury in an ionic condition to elemental mercury, utilizing argon gas to be a carrier, and blowing vapor with mercury atoms under normal temperature in a cold atomic absorption spectrometry instrument to measure. Mercury atoms have a strong absorption function to a resonance line whose wavelength is 253.7nm, and the relationship between the size of absorption and the concentration of mercury atoms is in accordance with the beer law in a certain concentration scope, and the mercury atoms are compared with standard series to do constant volume. The method overcomes the shortcomings of the sample handling method in the prior art, which optimizes the concentration of acid, sodium borohydride and sodium hydroxide and the flow of carrier gas (argon gas) in a flow-injection cold atomic absorption spectrometry instrument. The invention has the advantages of simple operation, quick speed, accuracy, excellent sensitivity and repeatability.

The invention relates to a method for distinguishing true apple juice from false apple juice by virtue of liquid chromatogram- isotope ratio mass spectrometry (LC-IRMS) determination. The method can be used for effectively distinguishing true apple juice from false apple juice and ensuring the quality safety of apple juice products. The method comprises the following steps: respectively preparing apples from different places into apple juice samples; analyzing plant polysaccharides in the prepared apple juice samples to establish plant polysaccharide determination conditions, and analyzing malic acid in the apple juice to establish the plant polysaccharide determination conditions; and analyzing natural apple juice to establish a linear relationship between the delta <13>C ratio of plant polysaccharides and malic acid in the apple juice to make judgment on the true and false apple juice, wherein if the delta <13>Csuc (sucrose) ranges from -1.909% to -2.647%, the delta <13>Cglu (glucose) ranges from -2.452% to -3.050%, the delta <13>Cfru (fructose) ranges from 2.522% to 3.196%, the ratio delta 1 of plant polysaccharides ranges from 0.27 to 2.78, the delta <13>Cmal (malic acid) ranges from -2.531% to 3.257% and the linear dependence coefficient R2 is more than 0.7255, the apple juice is true. The method is accurate in determination results and high in sensitivity, the quality of apple juice can be effectively guaranteed, adulterated apple juice can be prevented from causing injury to consumers, and economic and social benefits are tremendous.

The invention discloses a method and a device for measuring multi-channel ultrasonic flow-. Transducers which are twice as many as sound channels are mounted on a pipe section; every two transducers are connected with each other to form a sound channel; included angle of the sound channels and an axial line of the pipe section ranges from 15 to 75 degrees; a pressure sensor is placed at the front end of the pipe section; distances from the pressure sensor to the centers in the axle directions of all sound channels are the same; the sound channels corresponding to the transducers are divided into chordwise sound channels and radial sound channels; three or more than three chordwise sound channels are projected onto a cross section in the axial direction as a polygon. According to real-time detection of flow field pressure through the pressure sensor, a variance value and an initial value of the flow field pressure in one cycle are compared, and further time interval of flow measurement is increased or reduced, as a result, real-time adjustment of multi-channel measurement time interval is realized, and the method and the device are specially suitable for occasions of violent change of the flow field. Each sound channel comprises a radial sound channel and chordwise sound channels; and when obtained two speeds are compared, whether current state of the flow field is laminar flow or turbulent flow can be judged.

The invention discloses a quantitative detection method for pyrethriods pesticide in soil. The method is characterized by comprising the following steps: carrying out ultrasonic extraction on a soil sample by using an acetonitrile solution of which the volume fraction is 1%, purifying by using proper mixed filler of PSA and C18; carrying out nitrogen blowing and concentrating on supernate until nearly dry; dissolving and metering volume by using normal hexane; heating up and separating by using HP-5 quartz capillary column program; carrying out GC / muECD detection; finally quantifying by using a matrix external standard method. A test proves that the method is wide in linear range, the technical indicators such as the detection sensitivity, the accuracy and the precision meet the requirements of residue analysis, the quantitative detection method is simple in pre-treatment operation, convenient and fast, and reliable means is provided for analysis and research of pyrethriods pesticide residue in the soil.

The invention relates to a direct current brushed motor speed measurement device and speed measurement method. The speed measurement device is characterized by comprising a current sensor, a filter amplifying circuit, a signal comparison circuit, and a controller which are serially connected in turn. A logical operation unit is arranged in the controller. The speed measurement method is characterized by comprising the steps of: collecting a current signal of the direction current brushed motor through the current sensor; filtering and removing high frequency noise and direct current component in the current signal through the filter amplifying circuit; amplifying the signal; comparing a pulse component of the current signal with a reference voltage through the signal comparison circuit; generating a high-low alternating square wave speed signal to the controller; finally calculating the period or frequency of the speed signal through a logical operation unit built in the controller; and combining the number of mica sheets in a direct current brushed motor commutator and obtaining the corresponding motor speed through simple calculation. The speed measurement device and the speed measurement method can realize the speed measurement function of the direct current brushed motor through a simple circuit combination without increasing additional large devices on the motor, have low cost and no limitation of the use environment or a motor mechanical structure, and have a more accurate measurement result.

The invention belongs to the field of chemistry, and relates to a method for testing the nitrite and nitrate in pickled vegetables. The method for rapidly testing the nitrite and nitrate in pickled vegetables comprises the following steps that: (1) the nitrite and the nitrate in pickled vegetable are extracted by ultrasonic waves; (2) a calibration curve is drawn by using nitrosonitrogen (NO2-) standard solution; and a calibration curve is drawn by using nitronitrogen (NO3-) standard solution; (3) by diazotizing sulfamide, the nitrite in the pickled vegetable is coupled with hydrochloric acid N-(1-naphthyl)ethylenediamine, so that rosy azo dye is produced, and the content of the nitrite is determined at 540nm; (4) the nitrate in the pickled vegetable is reduced to nitrite by a cadmium column, the nitrite is determined, the determined nitrite in the same sample is subtracted, and the nitrate content is worked out.

The invention relates to a gas chromatography measuring method of the content of nicotine, myosmine, anabasine, neonicotine and conitine in a tobacco juice of an electronic cigarette. The method is characterized by comprising the following steps: preparing a sample solution to be measured by using an ultrasonic extraction method and compounding a mixed standard working solution with a level-7 concentration gradient; performing analysis by utilizing a gas chromatograph matched with a hydrogen flame ionization detector; and performing quantification by using a double internal standard method. The result shows that the nicotine, the myosmine, the anabasine, the neonicotine and the conitine in respective linearity ranges are good in linear relationships (R2 is greater than 0.998), wherein the limit of detection (LOD) ranges from 3.66mu g / g to 17.8mu g / g; the average recovery rate of three standard adding levels is between 97.1% and 104.6%; the relative standard deviation (RSD) is below 3.86%. Thus, the method is high in sensitivity and good in repeatability and recovery rate.

The present invention aims to provide a method for determining vitamin A and E in animal-derived food. Specifically, the invention employs the solid phase extraction and high performance liquid chromatography coupling technique to establish an on-line solid phase extraction-high performance liquid chromatography analytical method for simultaneous determination of vitamin A and vitamin E in animal-derived food. Furthermore, the invention also provides an on-line solid phase extraction analysis system for the detection of vitamin A and vitamin E.

The invention provides a flow temperature difference proportional cold energy distribution system and method and relates to a flow temperature difference cold energy distribution system and method, and the system and method provided by the invention can be used for solving the defects of a currently applied cold energy metering method and are accurate and reliable in a metered result. The system is characterized in that a main water return pipe at the tail end of a fan coil of each user is provided with a balanced valve with a flow measurement function and a return water temperature sensor; amain water supply pipe at the tail end of each fan coil is provided with a supply water temperature sensor; the supply water temperature sensor and the return water temperature sensor transmit signals to a remote transmission module through unit temperature collectors; and a cold energy meter is arranged on a main pipe and used for transmitting the signals to the remote transmission module. The method comprises the following steps: carrying out initial adjustment on a water system in a building; determining the flow distribution coefficient of the main water supply pipe at the tail end of thefan coil of each user; and calculating the cold energy distributed to each user. The cold energy metering system is low in failure rate and long in service time and can be used for achieving a cold energy fee distribution result which can be easily understood and accepted by people. The system provided by the invention is applied to buildings with fan coil air-conditioning systems.

The invention discloses a performance detecting device for heat tubes, which comprises a heating component, a heat dissipation component and a load bearing part, wherein the heating component and the heat dissipation component comprise a fixed part and a movable part respectively; the movable part and the fixed part can be disengaged or engaged; at least one measurement holding part capable of holding a to-be-detected heat tube is arranged between the opposite surfaces of the fixed part and the movable part; at least one temperature sensor is arranged in the measurement holding part; at least one heating element is arranged in the fixed part and the movable part of the corresponding heating component; at least one cooling structure is arranged in the fixed part and the movable part of the corresponding heat dissipation component; the load bearing part comprises a positioning seat and two clamping seats which are arranged on the positioning seat and can be slid and adjusted relative to the positioning seat; and the two clamping seats bear the heating component and the heat dissipation component respectively, adjust positions and position the two components.