CH255459A - Device for the electrical measurement of the water content of materials, in particular wood. - Google Patents
Device for the electrical measurement of the water content of materials, in particular wood.Info
- Publication number
- CH255459A CH255459A CH255459DA CH255459A CH 255459 A CH255459 A CH 255459A CH 255459D A CH255459D A CH 255459DA CH 255459 A CH255459 A CH 255459A
- Authority
- CH
- Switzerland
- Prior art keywords
- water content
- materials
- display element
- electrical measurement
- tuning
- Prior art date
Links
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
- G01N33/46—Wood
-
- 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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Wood Science & Technology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
Vorrichtung zur elektrischen Messung des Wassergehaltas von Materialien, insbesondere von Holz.
Bei der Verarbeitung von Wasser enthal- tenden Materialien, insbesondere von Holz, ist es von grosser Wichtigkeit, den Wassergehalt des verwendeten Materials schnell. einfach und genou bestimmen zu können.
Es gibt verschiedene bekannte Methoden. die die Messung des Wassergehaltes erlau- ben. Hauptsächlich angewandt werden :
1. Die Gewichtsbestimmung vor und nach einer vollständigen Austrocknung des Materials.
2. Die Messung der elektrischen Leitfähigkeit des Materials zwischen zwei Son den. die mit dem Material in Kontakt ge bracht werden. Die Leitfähigkeit und der Wassergehalt eines bestimmten Materials ste- hen in einem eindentigen Zusammenhang zueinander.
Ein Nachteil der bekannten elektrischen Messvorrichtungen besteht darin, da¯ das Messgerät mit dem Anzeigeorgan und die Sonden, mit Hilfe derer die Spannung an das Zll untersuchende Material angelegt wird. mechanisch voncinander getrennt sind und elektrisch durch die notwendigen Leitungen oder Kabel für die Messung miteinander ver bunden werden müssen.
Gemäss der Erfindung werden diese Nachteile behoben, indem Sonden und Mess gerät. mit Anzeigeorgan zu einer mechanischen Einheit zusammengebaut sind. Da der Zusammenhang zwischen Leitfähigkeit und Wassergehalt sich von Material zu Material ändert, ist f r jedes Material, das s gemesse@ werden soll, eine bestimmte, nur für dieses Material gültige Eichung vorzunehmen. Der gleiche Apparat ist also nur für ein bestimmtes Material geeicht ; er kann jedoch nach Auswechseln der Eichskala oder durch Benützung einer Korrekturtabelle aueh zu Messungen f r andere Materialien verwendet werden.
In der beiliegenden Zeichnung sind ver schiedene Ausführungsformen der erfin dungsgemässen Vorrichtung dargestellt.
Die Fig. 1 und 2 zeigen zwei Ansichten eines Ausführungsbeispiels. Die Vorrichtung besteht in der Hauptsache aus dem Anzeigeorgan n l, einer Me-ssschaltung 2 mit NetzgerÏt oder Batterie sowie aus den Sonden 3.
Alle drei Teile sind zu einer mechanischen Einheit zusammengebaut, und die Sonden können mittels der Handgriffe 4 in das Material gedrückt werden.
Die Fig. 3, 4 und 5 zeigen verschiedene Ausführungen von Anzeigeorganen.
In Fig. 3 ist das Anzeigeorgan n ein elektriches Zeigerinstrument 5, dessen Skala in Prozenten des Wassergehaltes geeicht ist.
In Fig. 4 ist das Anzeigeorgan eine Radio Abstimmanzeigerohre 6, wobei die Breite des Abstimmsektors direkt in Prozenten des Wassergehaltes geeicht ist.
Dieses Anzeigeorgan ist robuster und billiger als dasjenige in Fig. 3.
In Fig. 5 ist das Anzeigeorgan ebenfalls eine Radio-Abstimmanzeigeröhre 7, wobei der in Funktion des Wassergehaltes verschieden breite Abstimmsektor der Rohre mittels eines Regulierorganes 8 von Hand auf einen bestimmten, stets gleichen Wert eingestellt wird und auf der dem Regulierorgan zugeordneten Skala 9 der prozentuale Wassergehalt abgelesen wird.
Dieser Indikator ha. t gegenüber jenem der Fig. 4 den Vorteil, dass eine genauere Ablesung möglich ist.
Device for the electrical measurement of the water content of materials, in particular wood.
When processing materials that contain water, especially wood, it is of great importance to quickly check the water content of the material used. easy and genou to determine.
There are several known methods. which allow the water content to be measured. Mainly used are:
1. The weight determination before and after a complete drying out of the material.
2. The measurement of the electrical conductivity of the material between two probes. which are brought into contact with the material. The conductivity and the water content of a certain material are in a unique relationship.
A disadvantage of the known electrical measuring devices is that the measuring device with the display element and the probes with the aid of which the voltage is applied to the material to be examined. are mechanically separated from each other and have to be electrically connected to each other by the necessary lines or cables for the measurement.
According to the invention, these disadvantages are eliminated by using probes and measuring devices. are assembled with an indicator to form a mechanical unit. Since the relationship between conductivity and water content changes from material to material, a specific calibration that is only valid for this material must be carried out for each material that is to be measured. The same apparatus is therefore only calibrated for a certain material; However, after changing the calibration scale or by using a correction table, it can also be used for measurements for other materials.
In the accompanying drawings, various embodiments of the device according to the invention are shown.
FIGS. 1 and 2 show two views of an embodiment. The device mainly consists of the display element n l, a measuring circuit 2 with power supply unit or battery and the probes 3.
All three parts are assembled into a mechanical unit and the probes can be pressed into the material by means of the handles 4.
3, 4 and 5 show different designs of display elements.
In Fig. 3, the display element n is an electric pointer instrument 5, the scale of which is calibrated as a percentage of the water content.
In Fig. 4, the display member is a radio tuning indicator tubes 6, the width of the tuning sector being calibrated directly as a percentage of the water content.
This display element is more robust and cheaper than that in FIG. 3.
In Fig. 5 the display element is also a radio tuning indicator tube 7, the tuning sector of the tubes, which varies in width as a function of the water content, is set by hand to a certain, always the same value by means of a regulating element 8 and the percentage on the scale 9 assigned to the regulating element Water content is read.
This indicator has the advantage over that of FIG. 4 that a more precise reading is possible.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH255459T | 1946-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH255459A true CH255459A (en) | 1948-06-30 |
Family
ID=4471149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH255459D CH255459A (en) | 1946-09-12 | 1946-09-12 | Device for the electrical measurement of the water content of materials, in particular wood. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH255459A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE936480C (en) * | 1952-12-13 | 1955-12-15 | Karl Zaengl | Hand-held device for the detection of moisture shards enclosed in materials |
| DE1084495B (en) * | 1956-06-27 | 1960-06-30 | Dethloff Juergen | Method and device for determining the degree of freshness of animal meat tissue, preferably of farm fish |
| DE1120775B (en) * | 1954-10-23 | 1961-12-28 | Scottish Mechanical Light Ind | Measuring arrangement for determining the moisture content of loose or grainy material |
| WO1991008878A1 (en) * | 1989-12-08 | 1991-06-27 | Gebrüder Linck Maschinenfabrik 'gatterlinck' Gmbh & Co. Kg | Process for the rotary truing of planks and the like |
-
1946
- 1946-09-12 CH CH255459D patent/CH255459A/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE936480C (en) * | 1952-12-13 | 1955-12-15 | Karl Zaengl | Hand-held device for the detection of moisture shards enclosed in materials |
| DE1120775B (en) * | 1954-10-23 | 1961-12-28 | Scottish Mechanical Light Ind | Measuring arrangement for determining the moisture content of loose or grainy material |
| DE1084495B (en) * | 1956-06-27 | 1960-06-30 | Dethloff Juergen | Method and device for determining the degree of freshness of animal meat tissue, preferably of farm fish |
| WO1991008878A1 (en) * | 1989-12-08 | 1991-06-27 | Gebrüder Linck Maschinenfabrik 'gatterlinck' Gmbh & Co. Kg | Process for the rotary truing of planks and the like |
| US5255725A (en) * | 1989-12-08 | 1993-10-26 | Gebruder Linck Maschinenfabrik "Gatterlinck" Gmbh & Co. Kg | Process for the rotary truing of planks and the like |
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