• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
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    • 专利摘要:

    公开号:SE1000485A1
    申请号:SE1000485
    申请日:2010-05-11
    公开日:2011-11-12
    发明作者:Torsten Noresson
    申请人:Liros Electronic Ab；
    IPC主号:
    专利说明:

    Shelf life means the possible storage time in the current conditions, in terms of temperature and humidity. High temperature in a batch of, for example, some form of grain gives a limited storage time / shelf life, the same applies to high water content in the product, or a high relative humidity in the warehouse. A combination of high temperature and high water content in the product or high relative humidity measured inside the product or in the air in the storage room can mean a storage time / shelf life limited to a few days.
    When humidity is mentioned in this application, it is relative humidity that is meant, unless otherwise specifically stated.
    Description General part. state of the art and the problem: To detect and register the level in a layer of, for example, grain in real time.
    Today, grain is stored in ever larger silo facilities, it is not uncommon today with a steel silo that has diameters of, for example, 20 m.
    With increasing size, the value of the silo's content also increases. In the larger silos, for example 20 meters in diameter, each meter in the level represents a difference of 300 cubic meters, ie for example 240 tonnes of wheat.
    Due to the construction of the entire silo, it is not possible to see into the silo. There are no level glasses, windows or other openings.
    The manhole cover on the roof can of course be opened, but the road there is often a primitive ladder.
    If you go up to the manhole, you look into a dark silo, with no reference points to walk on. Without reference points, it is very difficult to determine whether the surface of the grain is 10 or 15 meters down. If reference points were present, there is still the problem of seeing these, lighting is installed inside, these must meet ATEX's requirements, due to the risk of dust explosion.
    There are several devices on the market for measuring the level inside the silo. But everyone has their limitations, such as; Measurements with Ultra sound sensor mounted over the grain, this is disturbed by dust swirling in the air, and the measurement is inaccurate at longer distances.
    The radar / echo sound principle has been used for these measurements, but the dust that swirls around inside the silo disturbs and again complicates the measurement, and the measurement is inaccurate at longer distances.
    Mechanical sensing with a weight that is lowered to the grain, the load on the vertical line is registered and when the weight lands on the grain, this is registered. Popularly called yo-yo, problems can arise if measurement is done at the same time as refilling. With many moving parts, the equipment is subject to wear.
    Capacitive sensors mounted at different heights, require that many sensors be mounted to achieve a sensible accuracy of the measurement. The Capacitive sensors are mostly used as limit positions, to signal whether a max or min level is exceeded. These sensors can also be difficult to adjust.
    Cereal is a product that causes other problems at level measurement, than for example oil.
    The surface of the oil, for example, is flat and horizontal, during the entire storage period.
    Cereals, on the other hand, when filled, or filled in a silo, have a pointed cone inside the silo, and the grain level is lowest out at the silo wall.
    But as soon as you have lost grain, an inverted cone is formed inside the silo, now the level is suddenly the highest level out at the silo wall. See Fig. 1 for a schematic view of a cut-through storage silo, where draining was the latest activity.
    If you know which activity was the last - filling or bottling - you also know a little more about what the surface looks like inside the grain silo.
    In today's larger silos, the temperature is closely monitored with temperature measuring lines to detect any temperature increases. As is well known, all biological activity in the product / grain means an elevated temperature. A rise in temperature thus indicates an ongoing undesirable biological activity. Good to know, but a better foresight is desirable.
    It should also be remembered that food easily molds in the refrigerator, mold growth is possible even close to 0 degrees Celsius, as long as nutrition and moisture / water are available.
    Normally, these temperature measuring lines can also give a certain idea of the storage height of the grain mass in the silo. This is due to the fact that the temperature in the cereals and the temperature in the air above the product inside the silo, rarely have the same temperature.
    But both spring and autumn come a period when the temperature of the air inside the silo and the grain can be the same.
    The shelf life / storage time of, for example, the grain is simplified greatly depending on the following factors, the temperature and water content of the grain, and the availability of water / moisture from ambient or supplied air or condensation from roofs and walls.
    Normally, the water content, for example in cereals, is carefully checked during storage, and these parameters are noted. If the temperature and moisture content are low, the durability is long, if both the temperature and moisture content are high, the durability is short. It is important to know these initial parameters, they form the basis for a calculation of the possible storage time, but these parameters can change during storage.
    So-called humidification means that the water content in, for example, cereals rises during storage, this occurs, for example, during storage over a longer period, for example storage from late summer / autumn to the following summer.
    Examples of long-term storage are intervention stocks, formerly called emergency stocks. Today, only the temperature of the product is measured during the storage period, no measurements of the water content of the product, such as cereals, nor any measurements of humidity, neither relative humidity nor otherwise, are normally made, other than any manual "sampling".
    The result is that you do not receive warning signals until the temperature rises in the product and the temperature measurement lines indicate that an unwanted biological activity has already started.
    A known problem in steel silos is that condensation can form inside the roof, and drip onto the product in the silo. This occurs when the relative moisture content of the air is high enough, while the temperature of the roofing sheet is low enough, below the dew point of the air. The exact values when this occurs can be found in tables.
    A, of dripping condensate moisture, before / or surface layer in a layer, can mean that the lot as a whole gets a lower quality classification, and become unusable as human food or animal feed. Mold spores are very dangerous to health, and the product present in the surface layer of the silo will be pulled down in the middle when emptied and mixed throughout the mass.
    To counteract this, ventilation fans can be started when the above-mentioned conditions are such that condensation can occur, and ventilate the space above the grain, but unfortunately today the necessary information is missing to know when you need to start the ventilation fans.
    In order to be able to place an order for a new product in, for example, a feed silo at the right time, it is required that you can continuously follow the level reduction day by day. The requirements for "Just in time" are increasing in virtually all industries. Section | Description of the invention: Compilation of drawing material: DRAWING The drawings show a possible embodiment of the invention, in a schematic manner.
    Fig. 1. Cross-cut silo with two measuring lines, measuring points marked with points on the lines. The silo appears a little more than half full, with grain, for example.
    A = measuring line B = measuring points on measuring line C = the product, for example grain D = ventilation opening under the eaves E = the air above the product Fig. 2. measuring point on the measuring line, the sensors can change places, or be combined in a sensor.
    F = sensor for measuring relative air humidity G = sensor for measuring temperature The object of the invention is to solve the above-mentioned problems.
    This is achieved by providing the above-mentioned temperature measuring lines with an additional function which also measures the relative humidity. And that the monitoring in the warehouse may be supplemented with a temperature sensor on the roof / roof plate.
    The solution can be achieved by using a sensor that in addition to measuring the temperature, also measures the relative humidity. Or by using two sensors. One to measure temperature and the other to measure relative humidity. It can be stated here that all measurements of relative humidity also require a measurement of the temperature, but we need a separate and clean temperature signal.
    The temperature and the relative humidity can thus be measured with a combined sensor or with two basically separate sensors mounted together or close to each other. See schematic sketch in Fig. 2, which shows two sensors (F and G), one for temperature measurement and the other for relative humidity.
    For level measurement, temperature values and humidity values are treated separately, this gives the operator or computer program two parallel level values which can be compared and one level value verifies, so to speak, the other.
    A level in the warehouse is thus produced based on the temperature measurement and a level based on the humidity measurement, these are combined into one level, thus ensuring that the reliability increases markedly.
    For sustainability measurement, both measurement values from each measurement point are combined, ie the temperature and humidity at each measurement point are jointly analyzed and compared with other measurement points in the same storage space, the most critical measurement point is presented in the system as a guide for calculating storage time.
    The temperature in the grain mass is normally even, with slow changes due to the inertia of the mass - this is in contrast to the temperature in the air above the grain which varies with the outdoor temperature in a daily cycle.
    The relative humidity measured down among the grains is normally even with slow changes due to the inertia of the mass, but in the air above the grains the humidity varies in daily cycles - as the temperature does, ie you get the day's variations both when measuring the relative humidity in the air, as well as on the temperature measurement. collected measured values can be evaluated / processed manually by the operator, or with the help of a program in a computer.
    Data from these measurements are sent to a computer with a suitable program, for evaluation of the measurement curves and registration for history / log, when evaluating, measurement data is compared between sensors on the entire line, over the day some sensors will show typical diurnal variations.
    In addition to these cyclic diurnal variations displayed by certain sensors, certain values measured by temperature and relative humidity can also be identified as typical or safe grain values or as air values.
    Typical temperature measurement today is to hang a measuring line in the middle (or near the middle) in a smaller silo - say up to a diameter of 6 - 8 meters. Larger silos then get more ropes. Although a large storage silo is equipped with 12 temperature measuring lines, not everyone needs the extra function to measure the relative humidity, and thus calculate the level and / or the shelf life of the product, one or two are normally sufficient. Fig. 1 shows a schematic storage silo with two measuring lines mounted / hanging in the roof construction.
    The measuring line, or the measuring lines, which are to measure both temperature and relative humidity can be mounted at a distance of 1/3 of the radius of the silo from the wall, thereby achieving the most accurate measuring result for level measurement - whether the most recent activity was a refill or a drain.
    This invention adds another parameter, namely the relative humidity / water content, and the probability of both temperature and water content must be equal for the cereals and for the air inside the silo is very small.
    We therefore look for the sensors on the measuring line that have variations of the day, the sensors that have these regular variations can with great certainty be assumed to be in the air, or the sensors whose values indicate that they are in the air, for example by measuring a clear lower temperature, for example at 7 - 8 degrees, when we know, for example, that the product is around 12 degrees.
    The level of the product / grain is below this level.
    We also look for the sensors that do not have the variations of the day, those that are in the cereals / product, or the sensors whose actual values indicate that they are in the cereals.
    The level of the product / grain is above this level.
    If we start looking from below, a number of sensors will show equivalent results, indicating that these sensors are in the product. Somewhere along the measuring line, temperatures and relative humidity will begin to vary more - indicating that they are in the air above the product.
    For even if the temperature in the air above the cereals and the temperature in the cereals can coincide at certain times of the year, and if the daily variations would be minimal at the same time, the probability is very small that the humidity will be the same in both media.
    However, being able to determine the level in the silo is not the only reason to measure the humidity in the bottom of the stored product. The relative humidity in the air down in the stored product has a relationship to the water content in the product - which can thus also be measured. During storage, the temperature outside the silo will vary, one side of the silo will face south and be heated more by the sun, than the north side.
    This phenomenon combined with the fact that almost all newer silos today are sheet metal silos with the wall consisting of a simple sheet metal, gives an impact on the product inside the silo.
    A steel silo does not really offer any insulation at all against climate changes, when the sheet metal wall is heated by the sun, the temperature in the stored product closest to the wall will start to rise.
    With changing seasons and changing weather, temperature differences will occur inside the grain mass, and also in the air over the grain.
    Temperature differences give air currents, and the air that flows in the product / grain gives a slowly varying water content seen along a time axis during the storage time. Even if this is slow, there is reason to monitor the process.
    Circulating air inside the grain mass and circulating air in a silo can transport water at all and thus moisturize the previously dried grain.
    The relative humidity will also vary in the air over the grain.
    Normally, the relative air humidity is highest in summer, and lowest in winter.
    The air circulation in the warehouse will increase when the temperature differences increase, for example in the spring when the sun begins to heat the south side of the silo.
    Some silos for storing, for example, grain have cooling fans / aeration fans mounted, so that you can blow air through the stored mass. You normally blow air from below and up through the mass.
    According to an article by Gunnar Lundin at JTI, 2008, entitled: "Aeration reduces mold growth in cereals", aeration inhibits mold growth. In an article by Nils Jonsson, Hans Pettersson, Johan Schnürer, also at JTI, 2008, entitled: "Risk of poisoning when storing grain", it appears that the time grain can be stored without mold formation can be doubled either by storing the grain with 1 - 3% lower water content, or in 5 degrees lower temperature.
    In other words, a humidification of 1 - 3% can halve the appropriate storage time.
    When aerating and cooling the grain, measured values from measuring lines are valuable information if the aeration has been sufficient and effective in the whole mass or only in parts of the stored mass.
    Without measuring possibilities, the fans may run longer than necessary, despite the fact that the grain mass as a whole is cooled / aerated, which leads to excessive energy consumption.
    Without measuring possibilities, there is also a danger that the economically minded operator will switch off the fans too soon, before the entire grain mass has been aerated.
    Moisture / water from the part of the product that is aerated can then collect in a moisture front, for example halfway up the product.
    The only possibility to detect a moisture front / a wetter sub-quantity in the product / mass early, are measurements of the relative humidity inside the product / grain.
    The reaction of the temperature sensors only comes when a biological activity is started, and then you have lost some time, and maybe also quality.
    But with continuous measurements of temperature and relative humidity, cooling, aeration fans can run the time it takes to process the entire amount of grain, neither more nor less.
    With a division / a distance / between the sensors (by sensors is meant measuring sensors for both temperature and relative humidity) of, for example, 2 meters, a corresponding resolution of the measurement is obtained.
    It is also possible to hang two or more measuring lines so that the sensors end up at different heights above the floor, ie mutually offset in height. This is to increase the resolution / accuracy of the measurement. By using a different division between the sensors, different Resolutions can be achieved, as desired.
    By mounting more than one line in the storage silo, the accuracy of the measurement can be further increased. not least depending on the grain angle of the grain, regardless of whether filling or bottling is in progress, the surface of the grain will be sloping towards the middle, sometimes the surface is convex and sometimes concave. A changing male landscape.
    Two measuring lines, mutually at different distances from the surface / eggs, can reveal whether the surface of the grain is convex or concave inside the silo. Information that can be evaluated manually by the operator, or using the appropriate software on a computer.
    The computer can calculate the storage level / storage height, as well as the volume of the stored item.
    Based on the volume, the number of tonnes can then be calculated if you have the specific weight.
    With the exception of gas-tight storage is not a silo is, built to be completely filled, one wants a ventilated space above the grain. On a steel silo, for example, there is normally an opening all the way around under the roof overhang, this opening is there to ventilate the space above the product. For a schematic view of the ventilation opening under the eaves of a storage silo, see Fig. 1 (D).
    During normal storage and operation, there will be at least one sensor in the air above the grain. This measuring point reports the humidity in the air and the temperature in the air to the system, this information is important to be able to avoid condensation forming inside the roof.
    When supplementing measuring lines with humidity measurement according to this invention, the dew point of the air can be easily calculated, and with a temperature sensor that measures the temperature of the ceiling / roof plate, the danger of condensation can be calculated manually with a table or in a computer program. The above-mentioned temperature sensor can also be mounted so that it measures the temperature on the cylindrical wall of the silo, high up. You probably then choose the north side to measure on the coldest side.
    This information means an opportunity to start the ventilation fans, if necessary, and ventilate the space at the top of the silo, to avoid condensation forming inside the roof / roof plate, or the silo wall. If you take in cold outdoor air, or cooled air, it is as cold as the roofing sheet and no water is condensed on the sheet. With the device and method according to this invention, danger of condensation inside the roof can be detected early.
    With the help of a suitable program in the computer, ventilation / fans can be started automatically, so that condensation can be avoided even if the system is unmanned.
    The temperature sensor for the roofing sheet is suitably mounted by means of a well-dimensioned magnet, or glue, rivet or screw. One can also imagine a temperature sensor mounted on / or built into one of the elements / sheet metal sections, ie mounted from the silo manufacturer.
    High temperature, as well as high relative humidity, each provides shorter storage time for, for example, a batch of grain, a combination of these two parameters provides significantly shorter storage time.
    Maximum suitable storage time can be calculated according to experience and / or practice and / or tables / schedules.
    Having access to measurements of both temperature and relative humidity also makes it possible to warn in time of mold risk, and other similar biological hazards, when the humidity and / or temperature is high.
    If a biological attack starts at a place in a warehouse, it spreads quickly if conditions such as temperature and access to water / moisture exist. The water can be present in the product being stored, or in the air mass in and / or over the product.
    With this invention, in addition to the temperature, the humidity can also be monitored at a number of places in the stored mass in the stored product, for example grain.
    Both current temperature and relative humidity inside the product are measured and registered, these values can be presented on a computer screen and manually converted to a maximum storage time.
    It is also possible to directly recalculate these parameters with a suitable computer program to a maximum suitable storage time / shelf life.
    Of course, one should take into account future use of the product, and include an appropriate safety margin, meaning that, for example, future foods have greater safety margins than, for example, cereals to be used for heating.
    Short shelf life of the product is equal to short shelf life. With more storage space in operation at a plant, it is important to know where you have the shortest shelf life. This 12 must of course be sold the fastest. If the product is to be stored for a longer period than the shelf life currently allows, you can, for example, run the product through the grain dryer, before continuing storage. Even if only a part of the product in a silo has too high a humidity and / or temperature, a drying of the entire batch may be necessary, all in order to maintain the quality of the product / batch.
    The equipment described here can also flag / signal that one or more levels in the warehouse have been passed, this can give a reason for an operator to act, or with a computer automatically perform, for example, an order for a new delivery. 13
    权利要求:
    Claims (1)
    [1]
    Claim 1: Claim 1 A device for calculating the current level / storage height in a warehouse, for example in a silo for grain storage, characterized in that both temperature and relative humidity are measured with one or more sensors, advantageously in several places in the warehouse, both in the stored product, as well as in the air above the level of the product, and with these measured values the storage height can be identified. A device for measuring the current level / storage height in a warehouse according to claim 1, characterized by one or more measuring lines provided with a number of measuring points, the measuring points contain partly a temperature sensor and partly a sensor for measuring the relative humidity, these can also be combined in a sensor, the measuring points are mounted with a suitable pitch (mutual distance) along the measuring line. Claim 3 A device for measuring the level in a warehouse, according to any one of the preceding claims, characterized in that both temperature and relative humidity are measured continuously, with at least one measuring line (possibly several measuring lines for better accuracy) hanging from above, roof construction, wall or the like and down in the stored product, the measuring line (s) are equipped with suitable sensors mounted on a suitable pitch (= mutual distance). Measured values for temperature and relative humidity in, for example, the grain mass will be relatively even and show a greater inertia, compared with the values measured in the air above the grain, the air above the grain varies in temperature and relative humidity during the day, and with conditions in the outdoor air. The level of the item in the warehouse can then be read out manually or by processing measurement data in a computer with a suitable program, by seeing which sensors whose measured values vary by the day, and which do not show values which vary by the day, partly the temperature, and partly the relative humidity. Claim 4 A device for measuring the level in a warehouse, according to any one of the preceding claims, characterized in that measurement data / values from the sensors are processed in a computer program to be presented on the screen and to be logged / registered in a history / log. A computer with a suitable program can sort out the measured values that vary with the day, and those that do not, and thus show which sensors / measuring points are hanging in the air over the product, for example the grain, and which are in the product, this provides storage level (Storage height). A manual evaluation of these measured values is also possible. A device for measuring the level in a warehouse according to any one of the preceding claims, characterized in that the durability of the stored product can also be assessed, with one or more measuring lines hanging from above, alternatively mounted in another way in the storage space, provided with measuring points. a sensor / or sensors, for measuring both temperature and the relative humidity, mounted with a suitable pitch (= mutual distance) along the length of the measuring line. By manually or with a computer program analyzing and matching temperature and humidity measurement from each measuring point, we get a measure of / a comparable value for the availability of both heat and moisture at each measuring point, and the combination of these measured values, by comparing these values from all measuring points in the storage space, the most unfavorable measured values / measuring point in the product can be identified and form the basis for a calculation of the maximum suitable storage time / shelf life for the batch as a whole. Claim 6 A device for measuring the level, and also the durability of the stored product in a warehouse, according to any one of the preceding claims, characterized in that both temperature and relative humidity are measured continuously, with vertical measuring linear storage space, for example mounted along inner wall, or hanging from the roof or roof structure and down into the product, these measuring lines are equipped with suitable sensors mounted on a suitable pitch (mutual distance), these sensors continuously record temperature and relative humidity, the measured values are logged in, and presented with, a computer and measured temperature values and relative humidity are monitored separately, and processed in combination to find the most exposed / critical measuring points in the lot, as well as the most exposed / critical measuring point, so that a value for durability for the lot can be obtained. Claim 7 A device for registering the storage level in a storage space, according to any one of the preceding claims, characterized in that condensation can also be foreseen on the ceiling, a measuring line hanging in the storage space is provided with sensors - to measure both temperature and relative humidity. division (= mutual distance) along the length of the measuring line. A temperature sensor mounted on the ceiling / roof plate measures the temperature of the ceiling or plate, this temperature is compared with measured values from the measuring line concerning the relative humidity in the air under the roof, and the equipment can warn of the risk of condensation forming on the inside of the roof plate. Measurement values can be processed manually or with a suitable computer program. The device can warn the operator or automatically start ventilation and cooling device that takes in outdoor air or cooled air into the room. By selecting appropriate margins when processing measured values, the device can warn before a condensation has occurred. Claim 8 A method for measuring the level in a layer, characterized in that by means of combined measurements of both temperature and relative humidity, at a plurality of levels in the layer, and due to the inertia of the large stored mass with respect to these mentioned parameters, and since the air above the mass in terms of these parameters will vary with the day, you can manually or with computer help sort out which sensors are in the mass and which are in the air. Thereby, the storage height can be easily determined and registered. Claim 9 A method for measuring the level in a warehouse, for example in a grain silo, according to the preceding claim, characterized by one or more measuring lines hanging from above, or mounted along a wall internally, and provided with measuring points containing both a temperature sensor and a sensor for measuring the relative humidity, the measuring points are mounted with suitable pitch (mutual distance) along the length of the measuring line, due to the inertia of the large stored mass in terms of these mentioned parameters, and as the air above the mass in terms of these parameters will vary by day, manually or with computer help sort out which sensors are in the mass and which are in the air. Thereby, the storage height can be determined and registered. A method for measuring the level in a warehouse, according to one or both of claims 8-9, characterized in that both temperature and relative humidity are measured continuously, with measuring lines in the warehouse space, for example hanging from a roof or roof structure and down into the product, these measuring lines are equipped with suitable sensors mounted on a suitable pitch (mutual distance). By studying measured values or processing these in a suitable computer program, the sensors that are in the product can be identified, as well as determining which sensors are in the air over the stored product. 17 Measured values for temperature and relative humidity in, for example, a grain mass will be relatively even and show a greater inertia, compared with the values measured in the air above the grain, the air above the grain varies in temperature and relative humidity during the day, and with conditions in the open air. The level of the product in the warehouse can then be read out manually or by processing measurement data in a computer with a suitable program, by seeing which sensors whose measured values vary with the day, and which do not show values that vary with the day, regarding temperature and the relative humidity. Thus, it is possible to assess how high the stored item extends, and the current level of the warehouse can be identified. A method for measuring the level in a warehouse, according to any one or more of claims 8 to 10, characterized in that the possible storage time of the product can also be calculated, by means of measurements of temperature and relative humidity inside the product, for example with a measuring line with measuring points contains a sensor / or sensors, for measuring both temperature and the relative humidity, mounted with a suitable pitch (= mutual distance) along the length of the measuring line. These sensors continuously record temperature and relative humidity, these measured values are logged in, and presented with a suitable program in a computer / computer screen and measured measured values for temperature and relative humidity in each measuring point are monitored individually and in combination. By manually or with a computer program analyzing and matching temperature and humidity measurement from each measuring point, we get a measure of / a comparable value for the availability of both heat and moisture at each measuring point, and the combination of these measured values, by comparing these values from all measuring points in the storage space, the most unfavorable measured values / measuring point in the product can be identified and form the basis for a calculation of the maximum suitable storage time / pouring time for the batch as a whole. Evaluation / calculation can be done manually or with the help of a computer, or PLC, with a suitable program. Claim 1 2 A method for registering the storage level in a storage space, according to one or more of claims 8 - 11, characterized in that condensation can also be foreseen on the ceiling, a measuring line hanging in the storage space is provided with sensors to measure both temperature and relative humidity. , these sensors are mounted with a suitable pitch (: mutual distance) along the length of the measuring line. A temperature sensor mounted on the ceiling / ceiling plate measures the temperature of the ceiling or plate, this temperature is compared with measured values from the measuring line concerning the relative humidity in the air under the roof, the processing of measured values can be done manually or in a computer with a suitable program. By selecting the appropriate margin to the dew point, the equipment can warn in time of the risk of condensation forming on the inside of the roof. The invention can warn the operator with a suitable signal, or automatically start the ventilation and cooling device. Through ventilation, outdoor air, or cooled air, is taken into the space under the roof and condensation is avoided. This is to prevent the stored product from being moistened by dripping condensation. 19
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    法律状态:
    2018-01-02| NUG| Patent has lapsed|
    2018-10-23| RINS| Reinstatement according to par. 72 patents act|Effective date: 20181004 |
    优先权:
    申请号 | 申请日 | 专利标题
    SE1000485A|SE536675C2|2010-05-11|2010-05-11|System and method for level measurement and quality monitoring in storage space, and calculate storage time / shelf life by measuring temperature and relative humidity|SE1000485A| SE536675C2|2010-05-11|2010-05-11|System and method for level measurement and quality monitoring in storage space, and calculate storage time / shelf life by measuring temperature and relative humidity|
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