WO1985000427A1 - Moisture meter for granular material, particularly for grain - Google Patents

Moisture meter for granular material, particularly for grain Download PDF

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Publication number
WO1985000427A1
WO1985000427A1 PCT/FI1984/000046 FI8400046W WO8500427A1 WO 1985000427 A1 WO1985000427 A1 WO 1985000427A1 FI 8400046 W FI8400046 W FI 8400046W WO 8500427 A1 WO8500427 A1 WO 8500427A1
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WO
WIPO (PCT)
Prior art keywords
grain
moisture meter
measuring cup
measuring
moisture
Prior art date
Application number
PCT/FI1984/000046
Other languages
French (fr)
Inventor
Markku Inkinen
Hannu Jokinen
Mikko Kuopanportti
Matti G. Wilska
Original Assignee
Oy Santasalo-Sohlberg Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oy Santasalo-Sohlberg Ab filed Critical Oy Santasalo-Sohlberg Ab
Publication of WO1985000427A1 publication Critical patent/WO1985000427A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G01N33/10—Starch-containing substances, e.g. dough
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity

Definitions

  • the present invention concerns a moisture content meter for granular material, particularly for grain, comprising a frame part, a cylindrical space confined by said frame part, a measuring cup disposed in said cylindrical space for receiving the grain to be measured and scales means for weighing the grain poured into said measuring cup, and in this moisture content meter said measuring cup being a capacitor having an impedance proportional to the moisture content and to the grain quantity.
  • the electrical moisture measuring methods employed most frequently in measuring the moisture content of granular material are based either on measurement of resistance in which the effect of moisture on the resistance of the material being examined is observed, on measurement of capacitance in which the moisture alters the dielectric constant and consequently the capacitance of the pick-up, or on impedance measurement in which the effect of moisture both on the resistance and the capacitance of the pick-up is observed.
  • the object of the invention is to teach an improvement of moisture measuring instruments of this type currently known.
  • a more detailed object of the invention is to produce a moisture meter known in the grain weighing there is no compelling dependence on any preset amount of grain mass: it is possible in accordance with the volume weight of the particular cereal, a quantity varying in a very wide range, to select the grain quantity which is most favourable from the viewpoint of the moisture determination, and this quantity will be measured out by the scales.
  • Still another object of the invention is to provide a moisture meter in which the accuracy of measurement is not dependent on the conditions of use, e.g. the temperature of the grain or of the moisture meter, nor the handling of the moisture meter or the amount of grain left in the measuring cup after the preceding measurement.
  • the aims of the invention are gained by a moisture meter which is mainly characterized in that the measuring cup is supported by at least two diaphragm spring means on the frame part of the moisture meter.
  • the diaphragm spring means are most advantageously corrugated metal diaphragm disks, so-called aneroid springs.
  • the scales means comprises a measuring capacitor, one component thereof attached to the frame part of the moisture meter and the other to the scales means, and said measuring capacitor being arranged to measure the movement of the measuring cup and on the basis of said movement, the weight of the poured grain.
  • the scales means comprises a tubular part disposed centrally in the bottom, made of insulating material, of the measuring cup.
  • the diaphragm spring means are attached to the tubular part of the scales means and on the other hand, to the frame part.
  • a temperature sensing element is disposed to enter from the bottom into the grain sample poured into the measuring cup.
  • the measuring capacitor is disposed in the space between the diaphragm balance spring means.
  • the moisture meter is disposed to display directly the hectolitre weight of the grain.
  • the linear scales means entails the advantage that the measuring of moisture content is not dependent on a predetermined grain mass: it is possible, for different grain varieties of greatly different volume weights, to select the grain quantity which is most advantageous in view of moisture determination, and this quantity is weighed by the scales. There is also no effect on the accuracy of measurement, in the moisture meter of the invention, from the way in which the grain is poured because moisture measurement does not start until the moisture meter has inferred that the grain pouring is positively finished.
  • the linear scales enables, of course, automatic taring, whereby the accuracy of measurement is not dependent on the conditions of use such as the temperature of the moisture meter, its handling and any grains left in the measuring cup after the preceding measurement.
  • the moisture meter of the invention in general is indicated by the reference numeral 10.
  • the moisture meter 10 comprises a frame part 11 defining a cylindrical space 12, a measuring cup 13 fitted into the cylindrical space 12 and a scales means 14 for weighing the grain poured into the measuring cup 13.
  • the measuring cup 13 is a capacitor, preferably a coaxial capacitor, its impedance being proportional to the moisture content and quantity of the grain.
  • the measuring cup 13 is supported by at least two diaphragm spring means 15, 16, which are most advantageously corrugated metal diaphragm disks or so-called aneroid springs, on the frame part 11 of the moisture meter.
  • the scales means 14 comprises a measuring capacitor 17, the first part 18 of which is attached to the frame part 11 of the moisture meter 10 and the second part 19 to the scales means
  • the measuring capacitor 17 measures the motion of the measuring cup 13 and on the basis of said motion, the weight of the grain poured into the measuring cup 13.
  • the scales means 14 comprises a tubular part 22, disposed centrally on the bottom 20, made of insulating material, of the measuring cup 13.
  • a temperature sensor 21 has been disposed to push from the bottom 20 of the measuring cup 13 into the grain sample that has been poured into the measuring cup 13.
  • the spring means 15,16 are advantageously attached to the tubular part 22 of the scales means.
  • the measuring capacitor 17 is preferably placed in the space 23 between the diaphragm spring means 15, 16.
  • the operation of the moisture meter 10 of the invention is as follows.
  • the moisture meter 10 is provided with a programme library loaded in a PROM memory, which may be programmed e.g. in the plant.
  • the main programme performs the preliminary steps, i.e., it checks whether the battery voltage is sufficient, it checks whether the grain type selector switch is correctly posiotioned, it sends to the display a go-ahead signal and tares the measuring cup 13, and it transmits to the display the symbol of the grain type selected.
  • the pouring of grain into the measuring cup 13 may be started. Thereafter, the programme examines at which time at least a given, preselected quantity of cereal has accumulated, at which time the programme shifts to measure the temperature, which is also displayed. When the temperature of the temperature pick-up no longer changes, the ultimate weight and moisture content of the grain are measured. Both are always measured twice in succession. The measuring is continued until two results are obtained which are sufficiently close to each other. In this way any measurements during grain pouring or while the meter is shaking are avoided, in which instances the result might not be reliable. When the weight is unstable, the moisture meter 10 makes the display flash, as a signal to the operator.
  • the moisture content that has been found is divided by the weight, whereby a result specific to the grain type is obtained which depends only on the moisture and temperature of the cereal.
  • the temperature correction is done by the aid of a certain correction programme, and from the memory are read given constants specific to the particular kind of grain.
  • the temperature-corrected result is substracted and further divided by given constants, also stored in the memory unit, whereby the approximate value of the moisture content is obtained, expressed in tenths of one percent.
  • the memory carries a correction table giving the corrections that have to be applied to the approximate value of the moisture content, at certain per cent unit intervals in a certain percentage range. If the approximate value of the moisture content falls between two tabulated values, the correction is interpolated. The corrected result is transmitted to the display, and the electricity supply of the entire apparatus except that of the display control circuit and the processor is disconnected.
  • the volume of the grain sample to be poured in is determined either using a separate pouring cup with predetermined volume, or the measuring cup 13 is poured full of grain and levelled to be brimfull.
  • the hectorlitre weight is found by dividing the weight found by the scales means 14, by the respective volume, and applying the moisture correction. If desired, the hectolire weight is then either displayed or without displaying taken into account as hectolitre weight correction in the moisture content measurement.
  • the moisture meter 10 of the invention differs from conventional moisture meters in that the quantity of grain subjected to measurement need not equal any preset quantity, instead of which the moisture meter 10 itself measures the weight of the sample.
  • a programme- based filtering action is provided so that shaking of the moisture will not produce an erroneous result.
  • the built-in weight measuring also enables the hectolitre weight of the grain to be determined. The temperature measurement takes place with a built-in pick-up, and for each grain variety two parameters are carried in memory, whereby the effect of the grain's moisture content on the required correction can also be taken into account.
  • each moisture meter 10 of the invention as such without any extra scale divisions or auxiliaries measures the temperature and moisture content of eight or more different grain varieties and displays the results digitally, minimizing the possible reading error.
  • each moisture meter according to the invention has a similar, ninth constant so-called basic scale, by the aid of which the user can for himself prepare a conversion table meeting his needs.
  • a table like this can easily in the manufacturing plant be loaded in the memory of the moisture meter as one of the standard grain varieties.

Abstract

A moisture meter (10) for granular material, in particular for grain. The moisture meter (10) comprises a frame part (11), a cylindrical space (12) defined by the frame part (11), a measuring cup (13) disposed within the cylindrical space (12) for receiving the grain to be measured, and a scale means (14) for weighing the grain that has been poured into said measuring cup (13). The measuring cup (13) of the moisture meter (10) is a capacitor of which the impedance is proportional to the moisture content and the quantity of the grain. The measuring cup (13) is supported by at least two diaphragm spring means (15, 16) on the frame part (11) of the moisture meter (10). The scale means (14) comprises a measuring capacitor (17), of which one part (18) is attached to the frame part (11) of the moisture meter (10) and the other part (19) to the scales means (14). The measuring capacitor (17) measures the movement of the measuring cup (13) and on the basis of this movement, the weight of the grain that has been poured into the measuring cup (13). The measuring capacitor (17) has been accomodated in the space ( 23) between the diaphragm spring means (15, 16).

Description

Moisture meter for granular material, particularly for grain
The present invention concerns a moisture content meter for granular material, particularly for grain, comprising a frame part, a cylindrical space confined by said frame part, a measuring cup disposed in said cylindrical space for receiving the grain to be measured and scales means for weighing the grain poured into said measuring cup, and in this moisture content meter said measuring cup being a capacitor having an impedance proportional to the moisture content and to the grain quantity.
The electrical moisture measuring methods employed most frequently in measuring the moisture content of granular material are based either on measurement of resistance in which the effect of moisture on the resistance of the material being examined is observed, on measurement of capacitance in which the moisture alters the dielectric constant and consequently the capacitance of the pick-up, or on impedance measurement in which the effect of moisture both on the resistance and the capacitance of the pick-up is observed.
Iti all said measuring modes a sample must be used, in order to gain an accurate moisture content figure for the material under examination, which prior to the measuring event has been brought into a given state, which must be repeatable at different times of measuring. This may be done e.g. by weighing or volume measurement, or by pressing the sample against the measuring electrodes with a known force. The separate sample standardizing phase which is necessary before the measurement proper renders the determination of moisture content laborious and slow and impairs the accuracy of measurement, particularly in the case of moisture meters intended for field use.
Through the U.S. Patent No. 3,794,911, a moisture meter for grain is known in which the separate grain sample weighing phase has been avoided by suspending the measuring cell used in capacitive measurement with the aid of a spring balance means from the instrument frame. After the correct grain quantity has been poured into the measuring cell, the weight of the sample closes a switch actuating a digital measuring circuit, and the moisture content figure is readable on the meter display. Although the problem solution just presented eliminates the problems associated with the standardizing of the grain sample, a drawback is for instance the effect of the mode of pouring on the accuracy of measurement. Attempts have been made to avoid this drawback by using an electronic delay circuit. In addition, the mechanics of the spring balance are difficult to manufacture, and costly.
The object of the invention is to teach an improvement of moisture measuring instruments of this type currently known. A more detailed object of the invention is to produce a moisture meter known in the grain weighing there is no compelling dependence on any preset amount of grain mass: it is possible in accordance with the volume weight of the particular cereal, a quantity varying in a very wide range, to select the grain quantity which is most favourable from the viewpoint of the moisture determination, and this quantity will be measured out by the scales. It is furthermore an object of the invention to provide a moisture meter in which the way in which the grain is poured has no influence on the reliability of measurement. Still another object of the invention is to provide a moisture meter in which the accuracy of measurement is not dependent on the conditions of use, e.g. the temperature of the grain or of the moisture meter, nor the handling of the moisture meter or the amount of grain left in the measuring cup after the preceding measurement. The other objectives of the invention and the advantages to be gained therewith are stated in the disclosure of the invention.
The aims of the invention are gained by a moisture meter which is mainly characterized in that the measuring cup is supported by at least two diaphragm spring means on the frame part of the moisture meter. The diaphragm spring means are most advantageously corrugated metal diaphragm disks, so-called aneroid springs.
According to claim 3, the scales means comprises a measuring capacitor, one component thereof attached to the frame part of the moisture meter and the other to the scales means, and said measuring capacitor being arranged to measure the movement of the measuring cup and on the basis of said movement, the weight of the poured grain.
According to claim 4, the scales means comprises a tubular part disposed centrally in the bottom, made of insulating material, of the measuring cup.
According to claim 5, the diaphragm spring means are attached to the tubular part of the scales means and on the other hand, to the frame part.
According to claim 6, a temperature sensing element is disposed to enter from the bottom into the grain sample poured into the measuring cup.
According to claim 7, the measuring capacitor is disposed in the space between the diaphragm balance spring means.
According to claim 8, the moisture meter is disposed to display directly the hectolitre weight of the grain.
With the moisture meter of the invention, several remarkable advantages are gained. First, in the moisture meter of the invention the linear scales means entails the advantage that the measuring of moisture content is not dependent on a predetermined grain mass: it is possible, for different grain varieties of greatly different volume weights, to select the grain quantity which is most advantageous in view of moisture determination, and this quantity is weighed by the scales. There is also no effect on the accuracy of measurement, in the moisture meter of the invention, from the way in which the grain is poured because moisture measurement does not start until the moisture meter has inferred that the grain pouring is positively finished. The linear scales enables, of course, automatic taring, whereby the accuracy of measurement is not dependent on the conditions of use such as the temperature of the moisture meter, its handling and any grains left in the measuring cup after the preceding measurement.
The invention is described in detail referring to an advantageous embodiment of the invention presented in the figure of the attached drawing, but to which the invention is not meant to be exclusively confined.
In the embodiment of the figure, the moisture meter of the invention in general is indicated by the reference numeral 10. The moisture meter 10 comprises a frame part 11 defining a cylindrical space 12, a measuring cup 13 fitted into the cylindrical space 12 and a scales means 14 for weighing the grain poured into the measuring cup 13. The measuring cup 13 is a capacitor, preferably a coaxial capacitor, its impedance being proportional to the moisture content and quantity of the grain.
According to the basic idea of the invention, the measuring cup 13 is supported by at least two diaphragm spring means 15, 16, which are most advantageously corrugated metal diaphragm disks or so-called aneroid springs, on the frame part 11 of the moisture meter. According to a second important characteristic feature of the invention, the scales means 14 comprises a measuring capacitor 17, the first part 18 of which is attached to the frame part 11 of the moisture meter 10 and the second part 19 to the scales means
14. The measuring capacitor 17 measures the motion of the measuring cup 13 and on the basis of said motion, the weight of the grain poured into the measuring cup 13.
In the embodiment shown in the figure, the scales means 14 comprises a tubular part 22, disposed centrally on the bottom 20, made of insulating material, of the measuring cup 13. A temperature sensor 21 has been disposed to push from the bottom 20 of the measuring cup 13 into the grain sample that has been poured into the measuring cup 13. In this embodiment, the spring means 15,16 are advantageously attached to the tubular part 22 of the scales means. The measuring capacitor 17 is preferably placed in the space 23 between the diaphragm spring means 15, 16.
The operation of the moisture meter 10 of the invention is as follows. The moisture meter 10 is provided with a programme library loaded in a PROM memory, which may be programmed e.g. in the plant. The main programme performs the preliminary steps, i.e., it checks whether the battery voltage is sufficient, it checks whether the grain type selector switch is correctly posiotioned, it sends to the display a go-ahead signal and tares the measuring cup 13, and it transmits to the display the symbol of the grain type selected.
Hereafter, the pouring of grain into the measuring cup 13 may be started. Thereafter, the programme examines at which time at least a given, preselected quantity of cereal has accumulated, at which time the programme shifts to measure the temperature, which is also displayed. When the temperature of the temperature pick-up no longer changes, the ultimate weight and moisture content of the grain are measured. Both are always measured twice in succession. The measuring is continued until two results are obtained which are sufficiently close to each other. In this way any measurements during grain pouring or while the meter is shaking are avoided, in which instances the result might not be reliable. When the weight is unstable, the moisture meter 10 makes the display flash, as a signal to the operator. The moisture content that has been found is divided by the weight, whereby a result specific to the grain type is obtained which depends only on the moisture and temperature of the cereal. The temperature correction is done by the aid of a certain correction programme, and from the memory are read given constants specific to the particular kind of grain. The temperature-corrected result is substracted and further divided by given constants, also stored in the memory unit, whereby the approximate value of the moisture content is obtained, expressed in tenths of one percent.
When now the approximate value of the moisture content is known, it must furthermore be corrected for irregularities occurring in the grain. For each kind of grain, the memory carries a correction table giving the corrections that have to be applied to the approximate value of the moisture content, at certain per cent unit intervals in a certain percentage range. If the approximate value of the moisture content falls between two tabulated values, the correction is interpolated. The corrected result is transmitted to the display, and the electricity supply of the entire apparatus except that of the display control circuit and the processor is disconnected.
When it is desired to measure and dispaly the hectorlitre weight of the grain, or merely to apply the hectolitre weight correction, the volume of the grain sample to be poured in is determined either using a separate pouring cup with predetermined volume, or the measuring cup 13 is poured full of grain and levelled to be brimfull. The hectorlitre weight is found by dividing the weight found by the scales means 14, by the respective volume, and applying the moisture correction. If desired, the hectolire weight is then either displayed or without displaying taken into account as hectolitre weight correction in the moisture content measurement.
It is thus understood that the moisture meter 10 of the invention differs from conventional moisture meters in that the quantity of grain subjected to measurement need not equal any preset quantity, instead of which the moisture meter 10 itself measures the weight of the sample. In addition, in the weight determination a programme- based filtering action is provided so that shaking of the moisture will not produce an erroneous result. The built-in weight measuring also enables the hectolitre weight of the grain to be determined. The temperature measurement takes place with a built-in pick-up, and for each grain variety two parameters are carried in memory, whereby the effect of the grain's moisture content on the required correction can also be taken into account. It is thus understood that the moisture meter 10 of the invention as such without any extra scale divisions or auxiliaries measures the temperature and moisture content of eight or more different grain varieties and displays the results digitally, minimizing the possible reading error. For those users who may wish to measure some rare kinds of grain or seeds, each moisture meter according to the invention has a similar, ninth constant so-called basic scale, by the aid of which the user can for himself prepare a conversion table meeting his needs. A table like this can easily in the manufacturing plant be loaded in the memory of the moisture meter as one of the standard grain varieties.
In the foregoing only one advantageous embodiment of the invention has been presented, and it is obvious to a person skilled in the art that various modifications thereof are possible within the scope of the inventive idea stated in the claims following below.

Claims

Claims
1. A moisture meter (10) for granular material, in particular for grain, comprising a frame part (11), a cylindrical space (12) defined by said frame part (11), a measuring cup (13) disposed within said cylindrical space (12) for receiving the grain to be measured, and a scales means (14) for weighing the grain poured into said measuring cup (13), and in said moisture meter (19) the said measuring cup (13) being a capacitor of which the impedance is proportional to the moisture content and quantity of the grain, characterized in that the measuring cup is supported by at least two diaphragm spring means (15, 16) on the frame part (11) of the moisture meter (10).
2. Moisture meter according to claim 1, characterized in that said diaphragm spring means (15, 16) consist of so-called aneroid springs.
3. Moisture meter according to claim 1 or 2, characterized in that the scales means (14) comprises a measuring capacitor (17), one part (18) thereof attached to the frame part (11) of the moisture meter (10) and the other part (19) to said scales means (14), and said measuring capacitor (17) being arranged to measure the movement of the measuring cup (13) and on the basis of said movement, the weight of the grain that has been poured into the measuring cup (13).
4. Moisture meter according to claim 3, characterized in that said scales means (14) comprises a tubular part (22) centrally disposed on the bottom (20), consisting of insulating material, of the measuring cup (13).
5. Moisture meter according to claim 4, characterized in that the diaphragm spring means (15,16) have been attached to the said tubular part (22) of the scales means (14).
6. Moisture meter according to any one of claims 1 to 5, characterized in that a temperature sensing element (21) has been arranged to push from the bottom (20) of the measuring cup (13) into the grain sample that has been poured into the measuring cup (13).
7. Moisture meter according to any one of claims 2 to 6, characterized in that the measuring capacitor (17) has been accomodated in the space (23) between the diaphragm spring means (15, 16).
8. Moisture meter according to any one of claims 1 to 7, characterized in that the moisture meter (10) has been arranged to indicate directly the hectolitre weight of the grain.
PCT/FI1984/000046 1983-07-01 1984-06-25 Moisture meter for granular material, particularly for grain WO1985000427A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI832418 1983-07-01
FI832418A FI832418L (en) 1983-07-01 1983-07-01 FUKTIGHETSMAETARE FOER KORNIGT MATERIAL, SPECIELLT FOER SAED.

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WO1985000427A1 true WO1985000427A1 (en) 1985-01-31

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089387A (en) * 1988-07-07 1992-02-18 Adeza Biomedical Corporation Dna probe diffraction assay and reagents
US9459225B2 (en) 2013-01-29 2016-10-04 Farmcomp Oy Moisture meter for determining the moisture content of particulate material
EP2693206B1 (en) * 2012-07-31 2018-03-21 Messtechnik Schaller GmbH Moisture meter for determining the water content of biomass

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3681685A (en) * 1970-01-22 1972-08-01 Cae Ind Ltd Capacitive moisture measurement
US3739264A (en) * 1971-06-11 1973-06-12 Agridustrial Electronics Grain moisture tester
GB1338941A (en) * 1971-04-05 1973-11-28 Mettler Instrumente Ag Force-measuring apparatus
US3794911A (en) * 1972-08-23 1974-02-26 Dickey John Corp Weight responsive moisture tester having time delay means and temperature compensation
EP0034459A2 (en) * 1980-02-14 1981-08-26 Satake Engineering Co., Ltd. Cereal grain moisture content measuring apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3681685A (en) * 1970-01-22 1972-08-01 Cae Ind Ltd Capacitive moisture measurement
GB1338941A (en) * 1971-04-05 1973-11-28 Mettler Instrumente Ag Force-measuring apparatus
US3739264A (en) * 1971-06-11 1973-06-12 Agridustrial Electronics Grain moisture tester
US3794911A (en) * 1972-08-23 1974-02-26 Dickey John Corp Weight responsive moisture tester having time delay means and temperature compensation
EP0034459A2 (en) * 1980-02-14 1981-08-26 Satake Engineering Co., Ltd. Cereal grain moisture content measuring apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089387A (en) * 1988-07-07 1992-02-18 Adeza Biomedical Corporation Dna probe diffraction assay and reagents
EP2693206B1 (en) * 2012-07-31 2018-03-21 Messtechnik Schaller GmbH Moisture meter for determining the water content of biomass
US9459225B2 (en) 2013-01-29 2016-10-04 Farmcomp Oy Moisture meter for determining the moisture content of particulate material
US9874535B2 (en) 2013-01-29 2018-01-23 Farmcomp Oy Moisture meter for determining the moisture content of particulate material

Also Published As

Publication number Publication date
FI832418A0 (en) 1983-07-01
FI832418L (en) 1985-01-02

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