Milk analyzer with replaceable sensor module and method for its operation

Abstract

The invention relates to a milk analyzer with a replaceable sensor module and a method for its operation, and especially to the fast and precise ongoing service maintenance and repair of analyzers with ultrasonic, temperature or infrared analysis, and in particular milk analyzers. The task of the invention is determined by a milk analyzer with a replaceable sensor module, which transfers part of the work of the analyzer's processor - (motherboard) to a replaceable sensor module. The removable sensor module, and in particular the microcontroller, makes the calculations and mathematical models, related to the calibration and recalibration of the analyzer, as well as the mathematical models, used to calculate the values of milk fat (Fat), dry non-fat milk residue content (SNF) and milk protein content (Prot), as well as the calculation of these indicators.

Description

[0001] MILK ANALYZER WITH REPLACEABLE SENSOR MODULE AND METHOD FOR ITS OPERATION

[0002] FIELD OF TECHNOLOGY

[0003] The invention relates to a milk analyzer with a replaceable sensor module and a method for its operation, and in particular, to the fast and precise current service maintenance and repair of analyzers with ultrasonic, temperature and infrared analyzing, and in particular, milk analyzers. The field of technology is the dairy industry, as well as the control of food liquids. It relates to the logistics and organization of mobile service activities for remote users of milk quality analyzing devices.

[0004] THE BACKGROUND OF THE INVENTION

[0005] Milk analyzers, which operate on the grounds of the impact on the analyzed product with ultrasound, operate on the well-known principle of changing the speed and amplitude of an ultrasonic wave when it passes through the test milk sample. This is achieved by a sensor module 1, which consists of an ultrasonic emitter 1.1, an ultrasonic receiver and, in particular, a sensor 2, heating tube 3, inlet for the test sample 1.2, and outlet for the tested sample 1.3 - Fig. 3. The measurement is performed under the condition of at least two-stage heating, with a minimum of heating at two different temperatures (differential measurement, usually 40°C and 60°C, in order to eliminate the influence of side random factors and electrical noise). The tested milk sample enters through the tested sample inlet 1.2 into the heating tube 3 and is heated; when the reference temperature is reached, ultrasound is simulated, which passes through the tested milk sample and is received by sensor 2. The unprocessed data received by sensor 2 - time delay (through which the speed is calculated) and amplitude of the ultrasonic wave from the emitter to receiver (sensor) 2, which passed through the testedsample, are sent to a controller for processing the unprocessed data, where it is processed and in the form of displaying milk indicators (content) of fat, dry nonfat residue and other, calculated final characteristics of the tested sample, are visualized on a monitor. Other relevant components of the analyzer, in addition to the sensor module with the ultrasonic emitter and sensor, described above, are: controller 6 (of which part of the components represent motherboard and nonvolatile memory), and display 7 representing a control unit. One of the purposes of the control unit is to process the unprocessed data, provided by the sensor. Regarding sensor module 1, it can be movably connected to the analyzer by a coupling (Fig. 2), or fixedly connected to the analyzer housing, so two options are possible, with respect to the ultrasonic sensor 2 movably connected to the controller by a detachable connection (coupling) or fixedly connected to the analyzer (device).

[0006] When manufacturing ultrasonic analyzers, differences of both mechanical and electrical nature occur, which are compensated by calibration of the entire devices; it occurs even after a service replacement of the sensor module (ultrasonic sensor). The data is stored in the devices where the sensor modules (ultrasonic sensors) are installed and are used throughout the entire service life of the devices. The calibration is performed by adjusting the entire device, in compliance with two criteria:

[0007] - temperature calibration, which is done once, as in this case the thermal properties of the ultrasonic sensor structure itself are subtracted from the differences in manufacturing and properties of the electrical elements (emitter and receiver);

[0008] - calibration with referent tested samples or functional calibration, directly related to the functions and tasks solved by the analyzer, for milks with different properties (fat content, dry non-fat residue, etc.); skimmed milk, normal cow and buffalo milk and cream are usually used.With the data obtained, the coefficients in the equations for calculating the values during subsequent measurements during the operation of the ultrasonic analyzers are calculated in the device.

[0009] Due to the nature of the structure of ultrasonic sensors, they are defective from corrosion and it is necessary to be periodically replaced. For this purpose, it is necessary to recalibrate the ultrasonic analyzers both in terms of temperature and with reference values of tested milk samples, as for this purpose the entire devices are needed. Up to now, the recalibration has been carried out in factory conditions, and in particular in laboratories with the necessary equipment, as for the recalibration of the entire milk analyzing devices, there are two possible ways: a / with a sensor, which is an integral part of the device, together with a controller for processing the data established during the recalibration process, which are in the form of displaying milk indicators, namely fat content and dry non-fat residue, as well as others calculated on their basis;

[0010] b / with a sensor, which is, however, a separate part of the device - on a removable coupling - with electrical connectors for the data, and with a controller for processing the raw data in the form of displaying milk indicators - fat content and hollow non-fat residue;

[0011] In these two ways, milk analysis devices are calibrated with reference values of the tested milk samples.

[0012] However, in the process of operation, the ultrasonic sensor wears out and becomes useless, which requires its replacement with a new one. When replacing the ultrasonic sensor (soldered or on a (replaceable) coupling with connectors, in which case it is one of the two methods specified above in points a) and b), it is necessary to recalibrate the entire device with tested milk samples, with different fat content and dry non-fat residue.

[0013] For calibration, as noted, it is required a dedicated laboratory, where the referent values of milks for calibration to be worked with are measured. But this servicing cannot take place in the field of the user of the ultrasonic milk analyzer, who by definition may be hundreds or thousands of kilometers away from a servicecenter, and usually the latter does not have the necessary laboratory. Returning to factory conditions for recalibration, logically, is associated with a loss of time and transportation costs, which in some cases exceed the repair and recalibration itself. It is clear that the transportation of the device, subject to service, is required to an existing repair facility for repair and replacement of the sensor.

[0014] A disadvantage of the described sensor module is that even if it is replaceable, which facilitates its replacement after the expiration date, the entire analyzer as a single and, accordingly, individual device, as a stand-alone object, should be transported to a service center with the appropriate stand, and a special laboratory, since after the replacement, the newly installed sensor should be calibrated once in temperature, as well as at least once functionally.

[0015] It is known a servicing method for an analyzer with a replaceable sensor module, which can be replaced on site, since the sensor located in the module, is equipped with a non-volatile memory, where a preliminary calibration is stored. When replacing the sensor, the entire sensor / memory module is replaced and the device operates with the specified preliminary calibration. For example, it is known a replaceable sensor module, consisting of an alcohol sensor, equipped with a non¬ volatile memory. The known method, by which such a replaceable module operates, consists of:

[0016] - Determining the technical condition of the sensor module in an analyzer;

[0017] - A replaceable sensor module, equipped with non-volatile memory, after which it is calibrated individually in advance, as the settings from the pre-calibration have been saved in the memory;

[0018] - Thus, the pre-calibrated sensor module, with a previously stored calibration, replaces the worn-out and replaceable module;

[0019] - The newly inserted, pre-calibrated sensor module supplies data to a signal processing module, located in the analyzer, connected to the module, and thus the repaired analyzer is ready for a new operating cycle. Patent application US 20070193335 AlA disadvantage of the method is that since it is pre-calibrated, although it allows easy service and replacement, it does not allow repeated subsequent calibration, dictated by the change of the tested sample and relevant memorization of each subsequent calibration, which can be called up when needed by the analyzer operator - a calibration which is due to and in view of the great difference in milk types, which difference implies different calibration types. The known method also does not provide the possibility of auto calibration.

[0020] It is known an ultrasonic milk analyzer, which is composed of a circuit for ultrasonic measurement of fat content and dry substance, and a circuit for control, by infrared measurement, for detecting impurities in liquid food products, especially in milk.

[0021] The ultrasonic measurement circuit consists of a pipeline, which is an ultrasonic module with an ultrasonic emitter at its beginning, and an ultrasonic sensor (receiver) at its end. The ultrasonic measurement circuit of the known ultrasonic analyzer includes, in addition to the ultrasonic module with the ultrasonic emitter and the ultrasonic sensor, also a unit for processing the reported data, composed of a power supply, a processor and an executive module connected to each other. A user interface is connected to the common unit for processing the reported data, which contains three working areas:

[0022] area for direct reporting of data obtained from the measurement of an ultrasonic analyzer;

[0023] area for direct reporting of data obtained from an infrared analyzer; and area for reporting corrected and consolidated data, obtained after processing the data from the two parallel streams and processed by the processor; The user interface has a feedback connection with the common unit for processing the reported data.

[0024] The analyzer works as follows: a tested milk sample enters the tube of the ultrasonic module, after which the ultrasonic emitter sends a signal that, depending on the qualities of the test sample, reaches the ultrasonic sensor, which measures them with different speeds and amplitudes. The data obtained from thesensor measurement are sent to the unit for processing the read data, which, after processing by the processor, are sent to the user interface.

[0025] The method of operation of this milk analyzer consists of:

[0026] - heating the tested sample to two temperatures - 40°C and 60°C;

[0027] - sending an ultrasonic pulse through the tested milk sample;

[0028] - reporting by the sensor of the values of the speed and amplitude of the ultrasonic pulse passed through the tested sample;

[0029] - submitting the raw data from the sensor to the analyzer's processor;

[0030] - analyzer's processor, using a preset calibration of the device, performs the relevant calculations, using a mathematical model, receives and visualizes the specific data, corresponding to the values of milk fat (Fat), dry non-fat residue content of milk - SNF and protein content in milk Prot.; BG 67448 Bl.

[0031] A disadvantage of the analyzer is that due to the nature of the design of the ultrasonic sensors, they are defective mainly of corrosion and need to be periodically replaced. After installing the new sensor, it is necessary to recalibrate the ultrasonic analyzers both in terms of temperature and with referent values of tested milk samples of different types, which requires presence in special service laboratories with special stands, which implies the physical presence of the entire device, since the processor with the calibration is an integral part of the device and contains all this information; and since the sensor is sequentially and directly connected to the processor and the executive module, in the common data processing and reading unit. Practically, the ultrasonic sensor performs only a registering function, where all processing of the reported data is performed in the other components of the device and especially in the processor. This factual circumstance requires the physical presence of the entire device in the service - on the one hand, for replacing the defective ultrasonic sensor and on the other hand, for subsequent calibration of the device. Moreover, if the device is hundreds of kilometers away from the service, the costs of performing these activities are more than the value of the replaced sensor.The task of the invention is to provide the milk analyzer with a replaceable sensor module and a method for its operation, which, apart from the sensor, and especially an ultrasonic sensor, to give the opportunity for easy and quick calibration, not only by using a stand in service conditions, but also by using another upright device of the same type or by using directly a pre-calibrated module, but equipped with many different types of calibrations. The replaceable sensor module should be able to store different calibrations, freely selectable subsequently in operating mode after servicing, by an operator, as well as be able to add new calibrations, as well as allow auto calibration. Hie task of the invention is to create a method for easy and cheap service maintenance, without requiring special knowledge, related to the analyzer's calibration.

[0032] SUMMARY OF THE INVENTION

[0033] The task of the invention is solved by a milk analyzer with a replaceable sensor module and a method for its operation, related to exporting part of work of the analyzer processor (motherboard) to a replaceable sensor module. In the replaceable sensor module and especially in a microcontroller, the calculations and mathematical models, related to the calibration and re-calibration of the analyzer are exported, as well as the mathematical models, under which the values of milk fat content (Fat), dry non-fat content of milk - (SNF) and protein content in milk (Prot) are calculated. When separating part of the functions from the analyzer processor (motherboard), it does not lose the ability to perform the same calculations that have been separated from the microcontroller, but functionally and antecedently, for the processor motherboard in the analyzer controller, the implementation of the analyzer operations, related to power supply control, data processing from peripheral devices (keyboard, monitors, etc.) remains. The replaceable sensor module includes not only an ultrasonic sensor and an ultrasonic emitter, but a heating tube with input and output for the tested sample, and also a microcontroller, equipped with a microprocessor and non-volatile memory, connected to each other. An ultrasonic sensor and an ultrasonicemitter are mounted at the two opposite ends of the heating tube. In the replaceable sensor module, the ultrasonic sensor and the ultrasonic emitter are connected to a microcontroller, equipped with an interconnected microprocessor and non-volatile memory - (Fig. 1);

[0034] The sensor module is made removable - on a coupling. The replaceable sensor module is connected to the motherboard of the analyzer's controller, connected to a display;

[0035] The method of operation of a milk analyzer with a replaceable sensor module has the following steps:

[0036] 1. Initial calibration, when training a new sensor is performed on a stand, as in the replaceable sensor module, apart from an ultrasonic emitter, heating tube, and ultrasonic sensor, a microcontroller is also installed, which contains a microprocessor and non-volatile memory;

[0037] 2. After replacing a removable sensor module, when replacing the old one with a new ultrasonic sensor, it is performed training of the new sensor, including temperature and functional calibration of the replaceable sensor module, according to the technical parameters of the newly installed ultrasonic sensor; 3. The operating functions are separated from the mathematical operating model, set in the motherboard of the analyzer's controller, by separating part of them, which is transferred to a microcontroller;

[0038] 4. In the replaceable sensor module and especially in the microcontroller, the calculations and mathematical models, related to the calibration and recalibration of the analyzer are exported, as well as the mathematical models by which the values of milk fat content (Fat), dry non-fat milk residue content (SNF) and milk protein content (Prot) are calculated.

[0039] 5. When separating part of the functions from the analyzer's controller (motherboard), it does not lose the ability to perform the same calculations separated from the microcontroller, but functionally and antecedently for the analyzer's controller, the implementation of operations, related to controlling theanalyzer power supply, processing data from peripheral devices (keyboard, monitors), etc. auxiliary working functions remains.

[0040] 6. From the motherboard of the analyzer's controller, the development of the laws and parameters, involved in the mathematical models of operation for controlling the temperature regimes in the analysis of different types of milk are exported to the microprocessor of the microcontroller, and they are stored in non-volatile memory;

[0041] 7. The microprocessor of the microcontroller produces the coefficients of the initial, intermediate or auto calibration, those that correspond to and depend on the type of milk and its composition, which are necessary for the operational work of the analyzer and are stored in non-volatile memory;

[0042] 8. The microprocessor, based on the thus prepared initial, intermediate or auto calibration, as well as the working mathematical models exported from the analyzer controller, calculates the values of milk fat content (Fat), dry non-fat residue content of milk - (SNF) and protein content in milk (Prot);

[0043] 9. In operating mode, when analyzing a specific tested milk sample, the microprocessor, in addition to performing steps 7 and 8 of the method mentioned above, has the ability, optionally, to submit the coefficients created and stored during calibration, and the raw, unprocessed data and indicators measured by an ultrasonic sensor, of the measured milk sample, specific propagation speed and amplitude in a heating tube, of the ultrasound in the test sample, current for the respective measurement, to the motherboard of the analyzer controller. In this case, as a function of the data received from the microcontroller and in particular the ultrasonic sensor, in real time, the motherboard of the analyzer controller, according to a mathematical model, also retains the ability to calculate - the values of milk fat content (Fat), dry non-fat residue content of milk - (SNF) and protein content in milk (Prot).

[0044] 10. When performing a recalibration or auto calibration, the operations: second, seventh and eighth are repeated, with the replaceable sensor module mounted on a technically sound analyzer of the same type, where the operations are repeatedin the same sequence and under the same conditions described above, without need for this to happen on a special stand.

[0045] The advantages of the replaceable sensor module in the milk analyzer and its method of operation consist, on the one hand, in the easy service replacement, even by a non-specialist, and on the other hand, in the possibility of sending precalibrated modules with new and trained sensors directly to the user, without the need for the entire analyzer to travel hundreds of kilometers to be correctly calibrated. But industrially, the preset calibration of the new ultrasonic sensor is only part of the advantage of the invention. The more significant advantage is the opportunity for the user himself to subsequently re-calibrate the analyzer he owns, depending on the type of the analyzed milk.

[0046] BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Fig. 1 shows a device - a milk analyzer with a replaceable sensor module

[0048] Fig.2 shows a milk analyzer of the known type, with a replaceable sensor module, which is movably connected to the analyzer housing by a detachable connection (coupling);

[0049] Fig. 3 shows a milk analyzer of the known type, with a non-removable sensor module, which is fixedly connected to the analyzer housing, by a rigid connection;

[0050] EXAMPLES OF IMPLEMENTATION OF THE INVENTION

[0051] A milk analyzer with a replaceable sensor module and a method for its operation has been created, as a replaceable sensor module 1 is installed in the device, which includes, apart from an ultrasonic sensor 2 and an ultrasonic emitter 1.1, mounted at the two opposite ends of a heating tube 3, equipped with input for the tested sample 1.2 and output for the tested sample 1.3, and a microcontroller 4. The sensor module is made on a coupling, in order to be replaceable. The replaceable sensor module 1 contains a microcontroller 4, connected to an ultrasonic sensor 2, an ultrasonic emitter 1.1 and a heating tube 3. The microcontroller 4 contains a microprocessor 4.1 and a non-volatile memory 4.2, which are interconnected. Thereplaceable sensor module 1 is linked by a bidirectional connection to the motherboard of controller 6, which in turn is connected to display 7;

[0052] In existing analyzers, even if the ultrasonic sensor 2 is replaceable, when replacing it in the laboratory, on a stand, the sensor should be calibrated, in order to give the analyzer measurement accuracy. Even if a pre-calibrated sensor is installed, this is not enough, since for different types of milk, under operating conditions in different regions, there is need for prior calibration on site or adding new calibrations, relevant to the new conditions. It is not possible to send the device (analyzer) to a service center every time. Therefore, using the above-mentioned device and method for its operation, a similar prior calibration is possible on another one of the same type, upright device, by installing the replaceable sensor module 1 in it and performing calibration.

[0053] Bringing out part of the operations from the controller 6 to the replaceable sensor module 1 and especially to the microcontroller 4 allows autonomous and independent adjustment, not only of a new sensor when replacing it, but also auto- and recalibration.

[0054] The device operates as follows: when replacing the ultrasonic sensor (sensor) 2 of the removable sensor module 1, it is necessary to calibrate the sensor. The tested milk sample is passed through the tested sample input 1.2, into a heating tube 3, where the sample is heated to referent temperature values. When the values are reached, ultrasound is emitted, and the newly installed ultrasonic sensor 2 receives the signal and sends the read values to the microprocessor 4.1. Microprocessor 4.1 produces, during the initial, intermediate or auto calibration, the coefficients that correspond to and depend on the type of milk and its composition, which are necessary for the operational work of the analyzer and are stored in non-volatile memory 4.2.

[0055] Microprocessor 4.1, based on the initial, intermediate or auto calibration thus prepared, as well as the 6 working mathematical models exported by the controller, calculates the values of milk fat content (Fat), dry non-fat milk residue content (SNF) and milk protein content (Prot);In operating mode, when analyzing a specific tested milk sample, the microprocessor 4.1, in addition to performing steps 7 and 8 of the method mentioned above, has the ability, optionally, to submit the coefficients created and stored during calibration, and the indicators measured by the ultrasonic sensor 2, of the measured milk sample, specific propagation speed and amplitude in the heating tube 3, of the ultrasound in the test sample, current for the respective measurement, to the motherboard of the controller 6. In this case, as a function of the data received from the microcontroller 4 and especially the ultrasonic sensor 2, in real time, the motherboard of the controller 6 of the analyzer, according to a mathematical model, also retains the ability to calculate - the values of milk fat (Fat), dry non-fat milk residue content - (SNF) and milk protein content (Prot), thus being able to duplicate the calculation of the final results;

[0056] When performing a recalibration or auto calibration, the second, seventh and eighth operations are repeated, as a replaceable sensor module 1 is mounted on a technically sound analyzer of the same type, where the operations are repeated in the same sequence and under the same conditions described above, without need for this to happen on a special stand.

[0057] APPLICATION OF THE INVENTION

[0058] The invention is used in measurements at milk acceptance points, milk processing enterprises, measurements by control bodies for the qualities of milk, used in products. The invention is used in dairy farms, to establish the initial parameters of the milk produced.

[0059] The invention is used in monitoring and controlling the health of herds, with the possibility of feedback, with indication of prescribed veterinary measures - prescription of feeding recipes, treatment with medications, etc., in dairy farms, in order to find out the initial parameters of the milk produced.

[0060] Literature:

[0061] 1. Patent BG 64468 Bl;

[0062] 2. Patent application BG110521 Al;

Claims

CLAIMSofMILK ANALYZER WITH REPLACEABLE SENSOR MODULE AND METHOD FOR ITS OPERATION1. A milk analyzer with a replaceable sensor module, which consists of a controller, a display and a replaceable sensor module, the replaceable sensor module is connected through a bidirectional connection to a controller, which in turn is connected to a display, as the replaceable sensor module includes a non¬ volatile memory, an ultrasonic sensor, and an ultrasonic emitter, which are mounted at both opposite ends of a heating tube, which is provided with an input and output for the tested sample; the replaceable sensor module is made on a coupling, characterized in that the replaceable sensor module (1) contains a microcontroller (4), which is connected through an input connection to an ultrasonic sensor (2), and through an output connection to an ultrasonic emitter (1.1), as the microcontroller (4) is connected through a bidirectional connection to a heating tube (3), as the microcontroller (4) contains a microprocessor (4.1) and non-volatile memory (4.2), bidirectionally connected to each other;2. A method for operating a milk analyzer with a replaceable sensor module containing an ultrasonic sensor, for replacing the defective sensor, supplying the replaceable sensor module with non-volatile memory and performing once recalibration of the new sensor on a special stand, with the new settings stored in non-volatile memory, characterized in that before the initial calibration, when training a new sensor on a stand, to the replaceable sensor module (1), in addition to the ultrasonic emitter (1.1), the heating tube (3), and the ultrasonic sensor (2), it is also mounted a microcontroller (4), where is installed the non-volatile memory (4.2), connected to the added microprocessor (4.1), only after which, when replacing the old ultrasonic sensor (2) in the replaceable sensor module (1), the training of the new sensor is performed, with temperature and functional calibration of thereplaceable sensor module (1), according to the technical parameters of the newly installed ultrasonic sensor (2), whereby the working functions of the mathematical model of operation set in the motherboard of the controller (6) of the analyzer are divided, separating part of these functions, namely - the mathematical calculations, related to the calibration and recalibration of the analyzer, as well as the mathematical models by which the values of milk fat content, dry non-fat residue content of milk, and protein content in milk are calculated and transferred to the microcontroller (4) and in particular to the microprocessor (4.1) of the microcontroller (4), which exported mathematical models also include the development of laws and parameters involved in the operating modes for controlling the temperature regimes in the analysis of different types of milk, and the same ones are memorized in the non-volatile memory (4.2), where they are stored, as in the controller (6) in normal operating mode, the implementation of the operations primarily related to the operation of the analyzer interface, its peripheral working parts related to power supply management, data processing from peripheral devices (keyboard, monitors, etc.), where despite the separation, from the motherboard of the controller (6) to the microcontroller (4), of part of the functions, directly related to the measurement, the controller (6) retains - practically it does not lose the opportunity of emergency execution, duplication of these same ones - the functions, separated to the microcontroller (4), after which the microprocessor (4.1) of the microcontroller (4) develops the coefficients of the initial, intermediate or auto calibration - those corresponding to and depending on the type of milk and its composition, those necessary for the operational work of the analyzer, and on the grounds of thus prepared initial, intermediate or auto calibration, as well as the working mathematical models exported by the analyzer controller, the microprocessor (4.1) calculates the values of fat content, dry non-fat residue content of the milk, and protein content in the milk, as in operating mode, when analyzing a specific tested milk sample, the microprocessor (4.1) repeatedly performs entirely or partially the steps of the method mentioned above, where it is possible, optionally, to submit the coefficients prepared and stored during thecalibration, and the raw, unprocessed data and indicators measured by an ultrasonic sensor (2), of the measured milk sample, and in particular the speed and amplitude of propagation in a heating tube (3), of the ultrasound in the tested sample, current, and corresponding to a specific measurement, directly to the motherboard of the controller (6) of the analyzer, and when performing a secondary recalibration or auto calibration, the operations mentioned above, or parts of them, are repeated, but only if the replaceable sensor module (1) has previously been installed not on a stand, but on another technically sound analyzer of the same type, where the operations are repeated in the same sequence and under the same conditions, as described for the stand, in the order described above, but without the need for a special stand for auto calibration or prior calibration.

3. A method for operating a milk analyzer with a replaceable sensor module, according to claim 2, characterized in that when replacing a replaceable sensor module (1), where the old one has already been replaced with a new ultrasonic sensor (2), upon subsequent recalibration or auto calibration, a subsequent training is performed in the replaceable sensor module (1), which consists of part of the actions performed during the initial training of the replaceable sensor module (1), namely temperature and functional calibration of the replaceable sensor module, according to the technical parameters of the newly installed ultrasonic sensor (2), as the microprocessor (4.1) of the microcontroller (4) produces the coefficients of the auto calibration or recalibration, those that correspond to and depend on the type of milk and its composition, which are necessary for the operational operation of the analyzer and are stored in a non-volatile memory (4.2), and based on thus prepared recalibration or auto calibration, calculates the values of milk fat content, dry non-fat milk residue content and protein content in milk.

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