Moisture content of a piece of sawn timber - Part 3: Estimation by capacitance method

This document specifies a non destructive method for estimating the moisture content of a piece of sawn timber. The standard describes the conditions which shall be met by a capacitance measuring system to derive a moisture content estimate for individual pieces of timber.
The standard applies to sawn timber and timber which has been planed or surfaced by other means.

Feuchtegehalt eines Stückes Schnittholz - Teil 3: Schätzung durch kapazitives Messverfahren

Dieses Dokument legt ein zerstörungsfreies Verfahren zur Schätzung der Holzfeuchte eines Stückes Schnitt-
holz fest. Diese Norm beschreibt die Bedingungen, die von einem kapazitiven Messsystem erfüllt werden
müssen, um die Holzfeuchte einzelner Stücke Schnittholz schätzen zu können.
Diese Norm gilt für Schnittholz und für Holz, das gehobelt oder anderweitig oberflächenbearbeitet wurde.

Teneur en humidité d'une pièce de bois scié - Partie 3: Estimation par méthode capacitive

Le présent document définit une méthode non destructive d�estimation de la teneur en humidité d�une pièce
de bois scié. La norme décrit les conditions qui doivent êtres remplies par un système de mesure capacitive
pour obtenir une estimation de la teneur en humidité pour des pièces de bois individuelles.
Cette norme s�applique aux bois sciés et aux bois rabotés ou surfacés par d�autres moyens.

Delež vlage v žaganem lesu – 3. del: Ocena z metodo kapacitivnosti

General Information

Status
Published
Publication Date
15-Mar-2005
Current Stage
9093 - Decision to confirm - Review Enquiry

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SLOVENSKI STANDARD
SIST EN 13183-3:2005
01-september-2005
Delež vlage v žaganem lesu – 3. del: Ocena z metodo kapacitivnosti

Moisture content of a piece of sawn timber - Part 3: Estimation by capacitance method

Feuchtegehalt eines Stückes Schnittholz - Teil 3: Schätzung durch kapazitives
Messverfahren
Teneur en humidité d'une piece de bois scié - Partie 3: Estimation par méthode
capacitive
Ta slovenski standard je istoveten z: EN 13183-3:2005
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
SIST EN 13183-3:2005 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13183-3:2005
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SIST EN 13183-3:2005
EUROPEAN STANDARD
EN 13183-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2005
ICS 79.040
English version
Moisture content of a piece of sawn timber - Part 3: Estimation
by capacitance method

Teneur en humidité d'une pièce de bois scié - Partie 3: Feuchtegehalt eines Stückes Schnittholz - Teil 3:

Estimation par méthode capacitive Schätzung durch kapazitives Messverfahren
This European Standard was approved by CEN on 3 February 2005.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13183-3:2005: E

worldwide for CEN national Members.
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SIST EN 13183-3:2005
EN 13183-3:2005 (E)
Contents Page

Foreword..............................................................................................................................................................3

1 Scope ......................................................................................................................................................4

2 Normative references ............................................................................................................................4

3 Terms and definitions ...........................................................................................................................4

4 Moisture content estimation with hand-held capacitance moisture meters ...................................4

4.1 Limits of application..............................................................................................................................4

4.2 Apparatus ...............................................................................................................................................5

4.3 Initial type testing ..................................................................................................................................5

4.4 Procedure ...............................................................................................................................................5

4.5 Expression of results ............................................................................................................................5

5 Moisture content estimation with in-line capacitance moisture meters..........................................5

5.1 Limits of application..............................................................................................................................5

5.2 Apparatus and measuring set-up.........................................................................................................6

5.3 Initial type testing ..................................................................................................................................6

5.4 Calibration ..............................................................................................................................................6

5.5 Procedure ...............................................................................................................................................6

5.6 Expression of results ............................................................................................................................6

Annex A (normative) Procedure for assessing the accuracy of capacitance moisture meters................7

Annex B (informative) Moisture content of a lot ............................................................................................9

Bibliography ......................................................................................................................................................10

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SIST EN 13183-3:2005
EN 13183-3:2005 (E)
Foreword

This document (EN 13183-3:2005) has been prepared by Technical Committee CEN/TC 175 “Round and

sawn timber”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by September 2005, and conflicting national standards shall be

withdrawn at the latest by September 2005.

This document is one of a series, dealing with methods of measurement for round timber and sawn timber.

Other standards in this series are:

EN 13183-1, Moisture content of a piece of sawn timber - Part 1: Determination by oven dry method

EN 13183-2, Moisture content of a piece of sawn timber - Part 2: Estimation by electrical resistance method

EN 1309-1, Round and sawn timber - Method of measurement of dimensions - Part 1: Sawn timber

EN 1310, Round and sawn timber - Method of measurement of features
EN 1311, Round and sawn timber - Method of measurement of biological degrade
This document includes a Bibliography.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland

and United Kingdom.
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SIST EN 13183-3:2005
EN 13183-3:2005 (E)
1 Scope

This document specifies a non destructive method for estimating the moisture content of a piece of sawn

timber. The standard describes the conditions which shall be met by a capacitance measuring system to

derive a moisture content estimate for individual pieces of timber.

The standard applies to sawn timber and timber which has been planed or surfaced by other means.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

EN 844-1:1995, Round and sawn timber - Terminology - Part 1: General terms common to round timber and

sawn timber

EN 844-3:1995, Round and sawn timber - Terminology - Part 3: General terms relating to sawn timber

EN 844-4:1997, Round and sawn timber –Terminology - Part 4: Terms relating to moisture content

EN 844-6:1997, Round and sawn timber - Terminology - Part 6: Terms relating to dimensions of sawn timber

EN 844-7:1997, Round and sawn timber - Terminology - Part 7: Terms relating to anatomical structure of

timber

EN 844-9:1997, Round and sawn timber - Terminology - Part 9: Terms relating to features of sawn timber

EN 844-12:2000, Round and sawn timber - Terminology - Part 12: Additional terms and general index

EN 13183-1, Moisture content of a piece of sawn timber - Part 1: Determination by oven dry method

EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC

17025:1999)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 844-1:1995,

EN 844-3:1995, EN 844-4:1997, EN 844-6:1997, EN 844-7:1997, EN 844-9:1997 and EN 844-12:2000 apply.

4 Moisture content estimation with hand-held capacitance moisture meters
4.1 Limits of application

This method is suitable for estimating the average moisture content of a piece of timber having a moisture

content between approximately 7 % and 30 %.

NOTE Any type of bipolar preservative, flame retardant, chemical or surface treatment may affect the accuracy of the

measurement and requires special calibration of the instrument for each type of treatment.

The estimated moisture content can be strongly affected by the type and reach of the moisture sensing system, the

moisture content distribution and the wood density under the sensor, the operating modus, the dimensions of the piece of

timber to be measured and the operator skills.
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SIST EN 13183-3:2005
EN 13183-3:2005 (E)

Any air gap between the timber surface and the sensing unit will strongly influence the reading. Very rough sawn or

uneven surfaces can only be measured if the shape of the condensator plate or probe secures good contact.

4.2 Apparatus

Hand-held capacitance moisture meter equipped with a flat shaped condensator plate surface, surface spring

electrode
...

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