CN106980332B - A kind of detection method of grain storage state - Google Patents
A kind of detection method of grain storage state Download PDFInfo
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- CN106980332B CN106980332B CN201710368859.1A CN201710368859A CN106980332B CN 106980332 B CN106980332 B CN 106980332B CN 201710368859 A CN201710368859 A CN 201710368859A CN 106980332 B CN106980332 B CN 106980332B
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- G—PHYSICS
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention discloses a kind of detection methods of grain storage state, comprising the following steps: (1) measures the grain capacitor in pre-set space；Temperature sensor is placed at the center of pre-set space, passes through the temperature of temperature sensor measurement temperature sensor itself；(2) under original state, the grain moisture content in pre-set space is normal, and the grain grain internal and external temperature of the grain in pre-set space is consistent, and the grain in pre-set space and temperature sensor reach thermal balance；When compared to original state, the temperature change that temperature sensor measures is little, and the grain capacitor in the pre-set space measured obviously increases, determine that the grain in pre-set space generates fever phenomenon；When compared to original state, the temperature change that temperature sensor measures is little, and the grain capacitor in the pre-set space measured dramatically increases, determine that the grain in pre-set space generates dew condensation phenomenon.The present invention can rapidly and accurately analyze and determine grain grain internal and external temperature, and whether whether consistent, grain generate heat, condense.
Description
Technical field
The present invention relates to grain storage fields, relate in particular to a kind of detection method of grain storage state.
Background technique
China is that a populous nation and grain-production big country, grain security involve the interests of the state and the people.China's grain storage rule
Mould is big and storage time is long, determines the importance of grain storage quality.Grain storage state is specifically divided into cereal temperature, grain water
Divide, whether grain generates heat (i.e. grain temperature abnormality is high, the rotten feature of grain).When grain moisture content is more than the corresponding safe moisture of grain temperature
When, grain may generate heat.Safe moisture under different temperatures is different, and universal law is grain Wen Yuegao, and safe moisture is lower.
Grain storage industry in China's has popularized grain temperature on-line monitoring at present, and several include the cable of multiple temperature sensors with several meters and are
In interval insertion grain, the grain temperature detector survey grid network of multilayer multiple spot is formed.
The grain of long-term storage (1-3) or safe production in summer balances phase under the conditions of practical controllable highest grain temperature, with grain heap
It is moisture content corresponding to 65% as the reference index for determining grain security moisture to humidity.Table 1 is provided by taking paddy as an example
Equilibrium water conten (selecting from, Wang Ruolan, grain and oil storage is learned, China Light Industry Press) under different temperature and humidity.Under normal circumstances, grain
Library in winter divulges information to reduce grain temperature to grain storage, closed silo after beginning of spring temperature of waiting for the coming year gets warm again after a cold spell, until next autumn and winter.?
During this, for grain in cryopreservation environment, moisture and temperature are relatively sufficiently stable.But the factors such as gas leakage can make grain between Ao
Temperature is gradually increasing, and needs additionally to divulge information if grain temperature is excessively high, to reduce grain temperature and suitably reduction moisture.Grain temperature is lower, safe water
Point higher, economic value is higher.In addition, an important feature of the infested mildew of grain is grain Wen Shangsheng, therefore the survey of grain temperature detector is
The main perception means of grain information monitoring at present.
Paddy equilibrium water conten under the different temperature and humidity of table 1
The cable for measuring temperature of the interior installation of grain storage national standard Ao at present is substantially the encapsulation temperature sensor in cable.
Cable for measuring temperature is inserted perpendicularly into grain, runs through grain bottom surface and surface.Each grain layer is detected positioned at the temperature sensor of different height
Temperature.
There are many kinds of temperature sensors, and as the contact temperature-measuring method that grain depot uses, temperature sensor can be on circuit
It is that a resistor (thermistor), two kinds of metals weld together (thermocouple) etc..The temperature of sensor itself can change
The resistance value of resistor, the potential difference between two kinds of metals, variation by detecting electrical parameter is counter to release temperature value.
It should be noted that it is the temperature of sensor itself that the working principle of temperature sensor, which determines measured temperature substantially,.
Only reach thermal balance in temperature sensor and environment, temperature reading is only ambient temperature value.Therefore only grain and temperature pass
After sensor reaches thermal balance, measured temperature is only cereal temperature.The temperature of only grain fever is diffused into temperature sensor
Position, it can just perceive grain overheat, and grain is the non-conductor of heat, and which results in cable for measuring temperature detection grain overheats to have
Certain hysteresis quality.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can rapidly and accurately analyze and determine temperature outside intragranular of putting out cereal
The detection method for the grain storage state whether degree is consistent, whether grain generates heat, condense.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme: a kind of detection method of grain storage state, packet
Include following steps:
(1) detection process
Measure the grain capacitor in pre-set space；Temperature sensor is placed at the center of pre-set space, passes through temperature sensing
The temperature of device measuring temperature sensor itself；
(2) deterministic process
Under original state, the grain moisture content in pre-set space is normal, the grain grain internal and external temperature one of the grain in pre-set space
It causes, the grain and temperature sensor in pre-set space reach thermal balance；
When comparing original state, the temperature that temperature sensor measures does not have significant change, and in the pre-set space measured
When grain capacitor increases extremely, determine that the internal and external temperature of the grain in pre-set space is inconsistent；
When comparing original state, the temperature change that temperature sensor measures is little, and the grain in the pre-set space measured
When capacitor obviously increases, determine that the grain in pre-set space generates fever phenomenon；
When comparing original state, the temperature change that temperature sensor measures is little, and the grain in the pre-set space measured
When capacitor dramatically increases, determine that the grain in pre-set space generates dew condensation phenomenon.
Further, pre-set space center place capacitance-type sensor for moisture content, by capacitance-type sensor for moisture content come
The grain capacitor in pre-set space is measured, and the abnormal of the grain moisture content measured with capacitance-type sensor for moisture content is increased, obviously increased
Add, dramatically increase to characterize the exception of grain capacitor and increase, obviously increase, dramatically increase.
Further, capacitance-type sensor for moisture content is integrated with temperature sensor.
Further, if grain moisture content normal value is X, grain moisture content increases to (1.07~1.18) X and increases to be abnormal, grain
It is to obviously increase that drinking water point, which increases to (1.19-1.38) X, and grain moisture content increases to 2.5X, and the above are dramatically increase.
Further, grain is rice, and rice moisture normal value is 14%, and rice moisture increases to 15% and increases to be abnormal
Add, rice moisture increases to 17% to obviously increase, and rice moisture increases to 40%, and the above are dramatically increase.
Further, grain is wheat, and wheat water content normal value is 12.5%, and it is abnormal that wheat water content, which increases to 13.5%,
Increase, wheat water content increases to 15% to obviously increase, and wheat water content increases to 40%, and the above are dramatically increase.
Further, grain is corn, and corn moisture normal value is 13%, and corn moisture increases to 15% and increases to be abnormal
Add, corn moisture increases to 18% to obviously increase, and corn moisture increases to 40%, and the above are dramatically increase.
The invention has the benefit that
The present invention is increased using grain dielectric constant as grain moisture content increases, and grain dielectric constant is with cereal temperature
The property for increasing and increasing, if grain grain internal and external temperature is inconsistent, moisture calculated value differs greatly when suitable with grain grain internal and external temperature,
Thus judge whether grain grain internal and external temperature is consistent；
The present invention is greater than temperature sensor temperature sensing space using capacitor space exploration, and moisture diffusion speed is greater than temperature
Conduction of velocity, grain dielectric constant property relevant to cereal temperature, if cereal temperature is than temperature sensor in pre-set space
Measured value is high, then the grain capacitor measured can be higher, and thus calculated grain moisture content is bright by the measured value before overheating than grain
Aobvious to increase, more than the normal range (NR) of grain storage moisture, thus judging grain, whether moisture is excessively high, and whether grain generates heat；
The present invention using water dielectric constant high grain an order of magnitude the characteristics of, if there are dews on grain surface, survey
The grain capacitor and grain moisture content calculating value obtained will significantly be higher by normal range (NR), thus judge whether grain condenses.
The present invention can rapidly and accurately detect that the capacitor (moisture) of grain changes and passes through the capacitor (water measured
Point) value, temperature value analytical judgment are put out cereal, and whether internal and external temperature consistent, whether grain generate heat, condense, so as to allow storage
Grain is safer, more high-quality.
The present invention can also judge that grain is carrying out which kind of ventilating, the expected effect reached of ventilation.In conjunction with grain depot
Intelligent ventilating system can to make ventilating more efficient, more acurrate, to realize energy-saving and emission-reduction, environment friendly and pollution-free.
Detailed description of the invention
Fig. 1 is the arrangement schematic diagram of silo inner sensor.
Fig. 2 is the relationship and variation diagram of the capacitor of embodiment 1, temperature and moisture.
Fig. 3 is the relationship and variation diagram of the capacitor of embodiment 2, temperature and moisture.
Fig. 4 is the relationship and variation diagram of the capacitor of embodiment 3, temperature and moisture.
The label of each component in attached drawing are as follows: between 1 Ao, 2 cables, 21 measurement points, 3 data read modules.
Specific embodiment
Below in conjunction with embodiment, the present invention will be described in detail.
The detection method of grain storage state of the present invention, comprising the following steps:
(1) detection process
Measure the grain capacitor in pre-set space；Temperature sensor is placed at the center of pre-set space, passes through temperature sensing
The temperature of device measuring temperature sensor itself；
(2) deterministic process
Under original state, the grain moisture content in pre-set space is normal, the grain grain internal and external temperature one of the grain in pre-set space
It causes, the grain and temperature sensor in pre-set space reach thermal balance；
When comparing original state, the temperature that temperature sensor measures does not have significant change, and in the pre-set space measured
When grain capacitor increases extremely, determine that the internal and external temperature of the grain in pre-set space is inconsistent；
When comparing original state, the temperature change that temperature sensor measures is little, and the grain in the pre-set space measured
When capacitor obviously increases, determine that the grain in pre-set space generates fever phenomenon；
When comparing original state, the temperature change that temperature sensor measures is little, and the grain in the pre-set space measured
When capacitor dramatically increases, determine that the grain in pre-set space generates dew condensation phenomenon.
Embodiment 1 is provided below, is described in detail by taking rice as an example, the moisture value of normal warehouse rice is in silo
14%, when moisture value is more than 17%, rice can then generate heat, or even mildew.
Embodiment 1
The present embodiment places capacitance-type sensor for moisture content at the center of pre-set space, is surveyed by capacitance-type sensor for moisture content
Determine the grain capacitor in pre-set space, and the exception of the grain moisture content measured with capacitance-type sensor for moisture content increase, obviously increase,
It dramatically increases to characterize the exception of grain capacitor and increase, obviously increase, dramatically increase.In this way, being easy reading and judgement.
Capacitance-type sensor for moisture content is substantially a capacitor, electric field line cover space certain around sensor (
That is pre-set space), grain capacitor in surveyed pre-set space except with grain moisture content at monotropic function in addition to, also by grain dielectric constant
Influence, therefore the grain capacitor in surveyed pre-set space can also characterize the grain dielectric constant in the pre-set space.Referring to figure
2, grain moisture content is constant, and grain dielectric constant increases with the increase of grain temperature；Grain temperature is constant, and grain dielectric constant is with grain
The increase of moisture and increase.The calculation method of grain moisture content is that temperature and capacitor are input quantity, and grain moisture content is output quantity.?
At a temperature of determining, grain dielectric constant can be considered constant, and the variation of dielectric constant caused by temperature change can be mended by temperature
Method is repaid to correct.
The moisture distribution in grain in surveyed pre-set space grain grain outwardly and inwardly.The moisture master of low moisture grain
It is distributed in grain intragranular portion.Limited, idol is freely rotated in constraint of the hydrone in grain intragranular portion by other molecules around starch etc.
Polar moment is smaller.As grain moisture content increases, grain moisture content gradually expands to outside from grain intragranular portion.Outside moisture is with multilayer molecular
The form of film exists, and with the increase of moisture, the number of plies of molecular film is gradually increased.The constraint that outside is subject to is fewer than internal, therefore
Dipole moment is bigger, and the dipole moment of the high-rise molecule of multilayer film is bigger than bottom, to the contribution of grain dielectric constant than grain intragranular portion
Moisture is big.It follows that grain dielectric constant (or grain capacitor) is increased monotonically as grain moisture content increases, and slope is in increasing
The trend added.
There is balance, when local grain moisture content is excessively high, water in grain moisture content and grain heap between relative air humidity
Molecule can be diffused into air, and then be diffused into the grain on periphery, and alternately, range of scatter is gradually expanded.
It is interior to arrange (6 × 13) totally 78 survey formula cables by taking (60 meters × 24 meters) 1 between standard silo Ao as an example referring to Fig. 1
2, cable is inserted perpendicularly into grain, runs through grain bottom surface and surface, there are four measurement point 21, each measurement point installation electricity for every cable
Appearance formula moisture transducer and temperature sensor, capacitance-type sensor for moisture content and temperature sensor can integrate together, facilitate peace
Dress, the electric field line coverage area of capacitance-type sensor for moisture content is using sensor as the centre of sphere, and the sphere of radius 25cm, cable top is set
There is data read module 3, facilitates reading.
The present invention is substantially to utilize capacitance-type sensor for moisture content inconsistent with temperature sensor test object and detect grain storage
State.Capacitance-type sensor for moisture content measurement is the grain capacitor in its electric field line covering space and the grain capacitor by measuring
Calculate grain moisture content, temperature sensor measurement detection be temperature sensor itself temperature, namely with outside temperature sensor
The grain surface temperature of surface contact.
The present invention is increased using grain dielectric constant as grain moisture content increases, and grain dielectric constant is with cereal temperature
The property for increasing and increasing, if grain grain internal and external temperature is inconsistent, difference when grain moisture content calculating value is suitable with grain grain internal and external temperature
It is larger, thus judge whether grain grain internal and external temperature is consistent；
The present invention is greater than temperature sensor temperature sensing space, water using capacitance-type sensor for moisture content electric field line covering space
Diffusion velocity is divided to be greater than temperature conduction speed, grain dielectric constant property relevant to cereal temperature, if condenser type moisture senses
Cereal temperature is higher than the measured value of temperature sensor in device electric field line covering space, then the grain that capacitance-type sensor for moisture content detects
Eating capacitor can be higher, and thus calculated moisture value will be significantly improved than the measured value before grain temperature overheat, more than grain storage moisture
Normal range (NR), thus judging grain, whether moisture is excessively high, and whether grain generates heat；
The present invention using water dielectric constant high grain an order of magnitude the characteristics of, if there are dew, electricity on grain surface
The grain capacitor and grain moisture content calculating value of appearance formula moisture transducer measurement will obviously be higher by normal range (NR), thus judge grain
Whether condense.
Referring specifically to Fig. 2, it is assumed that under original state, the grain moisture content in pre-set space is normal, the grain in pre-set space
Grain grain internal and external temperature it is consistent, grain in pre-set space and temperature sensor reach thermal balance, are set as a point (moisture value
14%)；
If the grain grain internal and external temperature of the grain in pre-set space is inconsistent, (i.e. grain generates heat by respiration, leads
Cause the grain intragranular portion temperature drift of grain), grain intragranular portion temperature drift, grain dielectric constant also can be higher at this time, but in high temperature
It is transmitted to before temperature sensor, temperature sensor temperature does not have significant change (variation is within 0.3 DEG C), but the default sky
Interior grain capacitor increases due to temperature rises in grain, and causing measuring grain moisture content value that can increase extremely (becomes b1 point, water
Score value 15%)；
If the grain in pre-set space causes to generate heat because moisture is excessively high, or even goes mouldy, is infested, temperature is transmitted in high temperature
Before sensor, temperature sensor measurement temperature change less (variation is within 1 DEG C), but the grain capacitor in the pre-set space
Increase because cereal temperature rises, measuring grain moisture content value is caused to obviously increase and (become b2 point, moisture value 17%)；
If the grain moisture condensation in pre-set space, since the dielectric constant of water is 25 DEG C of 80@, and grain is between 2-7, water
The high grain an order of magnitude of dielectric constant, before grain fever, less (variation is at 1 DEG C for temperature sensor measurement temperature change
Within), the grain capacitor in the pre-set space can dramatically increase and (become b point, 40% or more moisture value), it is possible thereby to send out in advance
Existing problem.
Conclusion: condenser type water can detecte when moisture value is b1 point (abnormal to increase) by the variation of a point according to the method
Whether the grain grain internal and external temperature that sub-sensor electric field line covers grain in space is consistent；When moisture value is that b2 point is (bright by the variation of a point
It is aobvious to increase) when, can detecte in capacitance-type sensor for moisture content electric field line covering space whether grain moisture content is higher, whether grain is sent out
Heat, so it goes mouldy, is infested；When moisture value is b point (dramatically increasing) by the variation of a point, capacitance-type sensor for moisture content can detecte
Whether the grain in electric field line covering space condenses.
Inventor passes through follow-up study, obtains: set grain moisture content normal value as X, grain moisture content increase to (1.07~
1.18) X is abnormal increase, and it is to obviously increase that grain moisture content, which increases to (1.19-1.38) X, and grain moisture content increases to 2.5X or more
To dramatically increase.
Specifically, for wheat, wheat water content normal value is 12.5%, and wheat water content increases to 13.5% and increases to be abnormal
Add, wheat water content increases to 15% to obviously increase, and wheat water content increases to 40%, and the above are dramatically increase；It is beautiful for corn
Meter Shui Fen normal value is 13%, and corn moisture increases to 15% and increases to be abnormal, and it is to obviously increase that corn moisture, which increases to 18%,
Corn moisture increases to 40%, and the above are dramatically increase.
During food storage, there is ventilating also frequently to adjust the environment temperature and grain moisture content of grain.It is logical
There are two the economic indicators that wind operation is considered: first is that energy consumption, that is, the expenditure such as spent electricity charge of divulging information；Second is that moisture loss, i.e.,
The grain moisture content that ventilation is taken away.
Low-moisture principle drops in ventilation, and when air humidity is medium or lower, air-flow passes through grain, promotes grain grain surface
Vapor volatilization.If increasing air humidity, according to table 1, the vapor in air can be progressed into grain, increase grain
Drinking water point, this ventilation is called conditioning and aeration.But conditioning and aeration may cause grain grain surface sweating, cause infested mildew.Moisture condensation
There is obvious distinguish in the dielectric constant (78 25 DEG C of@) of equal liquid waters poor an order of magnitude compared with grain (2-7), capacitance.Increase
It needs to monitor whether air inlet condenses when adding the conditioning and aeration of moisture.When condensing, it is passed through relatively dry air in time, keeps away
Exempt from grain fever.
Temperature sensor heat transfer is faster than grain, therefore in ventilation process, and temperature reading declines than grain internal temperature
Fastly, the former first reaches the temperature of air.As described above, grain dielectric constant is related to grain internal temperature, before ventilation
Grain moisture content difference may determine that whether grain grain internal temperature drops to requirement temperature (industry is known as " cold core ") afterwards, avoid excessively
Ventilation reduces energy consumption.
Below by taking rice as an example, then introduce capacitance-type sensor for moisture content and temperature sensor during two kinds of ventilatings
Measurement variation.
Embodiment 2
Reduce the force ventilation of grain temperature
As shown in figure 3, being a point (moisture value 14%) before ventilation, after divulging information after a period of time, cooled down outside grain grain
But internal temperature does not lower completely, and just becoming c point, (i.e. grain grain internal temperature is than grain grain external temperature and temperature sensor temperature
Degree declines slowly, therefore internal dielectric constant declines slowly.But moisture measurement value is according to sensor temperature and internal dielectric constant
It calculates, so moisture measurement value will increase, sensor temperature decline；15.5%) moisture value is；It is fallen to grain grain internal temperature
After coming, grain intragranular is outer and temperature sensor reaches thermal balance again, and c point can eventually become d point (moisture value 13.5%), i.e. grain
Drinking water point is because ventilation generates partial loss.
Conclusion: according to the method, can reflect to quicklook grain in cooling ventilation process, temperature sensor measurement
Variation of ambient temperature is very fast, but the grain intragranular portion temperature change of grain is slower, and when internal and external temperature balance, grain moisture content can slightly have
It reduces.
Embodiment 3
The conditioning and aeration to moisturize
As shown in figure 4, moisture concentrates on grain grain surface and outside, capacitance-type sensor for moisture content capacitor when ventilation just starts
Increase, after moisture diffusion to grain intragranular portion, grain intragranular portion's dielectric constant is smaller than outside grain grain, and capacitance-type sensor for moisture content is surveyed
The capacitor obtained can be gradually reduced.Moisture measurement value can be first obvious to increase from initial value a point (moisture value 13%) in this process
Add to e point (moisture value 16%), after gradually become smaller and level off to plus water after moisture true value f point (moisture value is
14.5%).
Conclusion: according to the method, can reflect to quicklook grain during conditioning and aeration, capacitance-type sensor for moisture content
The moisture value of measurement obviously increases due to grain surface is born water, and the variation of grain internal moisture is slower, flat to free surface moisture in grain
When weighing apparatus, capacitance-type sensor for moisture content measures moisture value and falls after rise and close to true value.
It should be understood that example as described herein and embodiment are not intended to restrict the invention, this field only for explanation
Technical staff can make various modifications or variation according to it, all within the spirits and principles of the present invention, made any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of detection method of grain storage state, which comprises the following steps:
(1) detection process
Measure the grain capacitor in pre-set space；Temperature sensor is placed at the center of pre-set space, is surveyed by temperature sensor
Determine the temperature of temperature sensor itself；
(2) deterministic process
Under original state, the grain moisture content in pre-set space is normal, and the grain grain internal and external temperature of the grain in pre-set space is consistent, in advance
If the grain and temperature sensor in space reach thermal balance；
When comparing original state, the temperature that temperature sensor measures does not have a significant change, and the grain in the pre-set space measured
When capacitor increases extremely, determine that the internal and external temperature of the grain in pre-set space is inconsistent；
When comparing original state, the temperature change that temperature sensor measures is little, and the grain capacitor in the pre-set space measured
When obviously increasing, determine that the grain in pre-set space generates fever phenomenon；
When comparing original state, the temperature change that temperature sensor measures is little, and the grain capacitor in the pre-set space measured
When dramatically increasing, determine that the grain in pre-set space generates dew condensation phenomenon；
Deterministic process measures the grain capacitor in pre-set space by capacitance-type sensor for moisture content, and with condenser type moisture sensing
The exception for the grain moisture content that device measures increases, obviously increases, dramatically increasing to characterize the abnormal increase of grain capacitor, obvious increasing
Add, dramatically increase, if grain moisture content normal value is X, grain moisture content increases to (1.07~1.18) X and increases to be abnormal, grain water
It is to obviously increase that dividing, which increases to (1.19~1.38) X, and grain moisture content increases to 2.5X, and the above are dramatically increase.
2. the detection method of grain storage state as described in claim 1, which is characterized in that place capacitor at the center of pre-set space
Formula moisture transducer.
3. the detection method of grain storage state as claimed in claim 2, which is characterized in that capacitance-type sensor for moisture content and temperature pass
Sensor integrates.
4. the detection method of the grain storage state as described in claims 1 or 2 or 3, which is characterized in that grain is rice, rice water
Dividing normal value is 14%, and rice moisture increases to 15% and increases to be abnormal, and it is to obviously increase that rice moisture, which increases to 17%, rice
Moisture increases to 40%, and the above are dramatically increase.
5. the detection method of the grain storage state as described in claims 1 or 2 or 3, which is characterized in that grain is wheat, wheat water
Dividing normal value is 12.5%, and wheat water content increases to 13.5% and increases to be abnormal, and it is to obviously increase that wheat water content, which increases to 15%,
Wheat water content increases to 40%, and the above are dramatically increase.
6. the detection method of the grain storage state as described in claims 1 or 2 or 3, which is characterized in that grain is corn, corn water
Dividing normal value is 13%, and corn moisture increases to 15% and increases to be abnormal, and it is to obviously increase that corn moisture, which increases to 18%, corn
Moisture increases to 40%, and the above are dramatically increase.
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| CN110286144B (en) * | 2019-07-12 | 2020-07-21 | 吉林大学 | Grain heap condensation prediction method |
| CN114373289A (en) * | 2021-12-08 | 2022-04-19 | 航天信息股份有限公司 | Early warning and alarming system and method for grain condition |
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| CN101285720A (en) * | 2008-05-29 | 2008-10-15 | 山西中谷科贸有限公司 | On-line measurement digital sensing device for grain depot foodstuffs temperature and moisture |
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| CN203673369U (en) * | 2014-02-07 | 2014-06-25 | 哈尔滨商业大学 | Humidity remote detection controller for grain warehouse |
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