ASTM D6782-04

Standard Test Methods for Standardization and Calibration of In-Line Dry Lumber Moisture Meters

SCOPE
1.1 These test methods apply to instruments designed to detect, or measure, moisture in wood which has been dried below the fiber saturation point. The purpose of these tests is to provide a unified standard against which such systems can demonstrate their suitability for their intended use (see Appendix X1).
1.2 The standard is configured to support tests by moisture meter manufacturers as well as end-users of such systems, therefore the text follows two tracks (see Appendix X2).
1.3 Test methods specified for manufacturers are generally designed for laboratory settings and are intended to provide a standard against which a manufacturer certifies calibration and general system conformance.
1.4 Test methods for end-users are generally designed for field settings and are intended as a standardized set of procedures for determining the suitability of a specific machine for a particular use.
1.5 Applications such as lumber marking or sorting systems utilizing the output of the in-line meter are not part of this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Mar-2004
• ICS: 79.040 - Wood, sawlogs and sawn timber
• Technical Committee: D07 - Wood
• Drafting Committee: D07.01 - Fundamental Test Methods and Properties

Relations

• Replaces: ASTM D6782-02 - Standard Test Methods for Standardization and Calibration of In-Line Dry Lumber Moisture Meters
• Effective Date: 01-Apr-2004
• Replaced By: ASTM D6782-05 - Standard Test Methods for Standardization and Calibration of In-Line Dry Lumber Moisture Meters
• Effective Date: 01-Oct-2005
• Referred By: ASTM D7438-20 - Standard Practice for Field Calibration and Application of Hand-Held Moisture Meters
• Effective Date: 01-Apr-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6782–04
Standard Test Methods for
Standardization and Calibration of In-Line Dry Lumber
1
Moisture Meters
This standard is issued under the fixed designation D 6782; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 2915 Practice for Evaluating Allowable Properties for
Grades of Structural Lumber
1.1 These test methods apply to instruments designed to
D 4442 TestMethodsforDirectMoistureContentMeasure-
detect, or measure, moisture in wood which has been dried
ment of Wood and Wood-Base Materials
belowthefibersaturationpoint.Thepurposeofthesetestsisto
D 4444 TestMethodsforUseandCalibrationofHand-Held
provide a unified standard against which such systems can
Moisture Meters
demonstrate their suitability for their intended use (seeAppen-
D 4933 Guide for Moisture Conditioning of Wood and
dix X1).
Wood-Base Materials
1.2 The standard is configured to support tests by moisture
D 5536 Practice for Sampling Forest Trees for Determina-
meter manufacturers as well as end-users of such systems,
tion of Clear Wood Properties
therefore the text follows two tracks (see Appendix X2).
1.3 Test methods specified for manufacturers are generally
3. Terminology
designed for laboratory settings and are intended to provide a
3.1 Definitions of Terms Specific to This Standard:
standard against which a manufacturer certifies calibration and
3.1.1 accept/reject meters, n—meters that permit identifica-
general system conformance.
tion and/or sorting of pieces into moisture content classes. The
1.4 Test methods for end-users are generally designed for
simplest design has one set point or target level to separate
field settings and are intended as a standardized set of
“wetter” from “drier” pieces. Often the meters described in
proceduresfordeterminingthesuitabilityofaspecificmachine
3.1.5 may be operated as accept/reject meters.
for a particular use.
3.1.2 field, n—an environment usually not meeting the
1.5 Applications such as lumber marking or sorting systems
criteria of 3.1.4. This is often a meter installation at the wood
utilizing the output of the in-line meter are not part of this
processing facility where the meter and the lumber are subject
standard.
to the process environment of mill production.
1.6 This standard does not purport to address all of the
3.1.3 flow, n—a term that describes the movement and
safety concerns, if any, associated with its use. It is the
orientation of the piece with respect to the sensing area.
responsibility of the user of this standard to establish appro-
3.1.3.1 longitudinal-flow—in this flow arrangement, pieces
priate safety and health practices and determine the applica-
pass lengthwise through the sensing area. All or some portion
bility of regulatory limitations prior to use.
of the length may be sensed.
2. Referenced Documents 3.1.3.2 transverse-flow—in this flow arrangement, the
2
pieces pass crosswise through the sensing area. Transverse
2.1 ASTM Standards:
meters frequently have more than one sensing area, conse-
D 1990 Practice for Establishing Allowable Properties for
quently, the meter may sense more than one area of the piece
Visually-Graded Dimension Lumber from In-Grade Tests
even if the entire piece is not sensed.
of Full-Size Specimens
3.1.4 laboratory, n—an environment under which condi-
D 2395 Test Methods for Specific Gravity of Wood and
tions of temperature and moisture content can be controlled
Wood-Base Materials
within stated tolerances and which permit use of carefully
selected and controlled specimens.
1
These test methods are under the jurisdiction of ASTM Committee D07 on
3.1.5 meters, n—in-line (or in process) moisture sensors
Wood and are the direct responsibility of Subcommittee D07.01 on Fundamental
designed to respond in one pass to the moisture content of a
Test Methods and Properties.
piece passing the sensing area.
Current edition approved April 1, 2004. Published May 2004. Originally
3.1.5.1 Discussion—Meters are typically a system consist-
approved in 2002. Last previous edition approved in 2002 as D 6782-02.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ing of one or more fixed sensing areas (termed heads) and a
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
processing/readoutconsolethatmayberemotefromtheregion
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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