ASTM-D4444 2008(Redline)

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D4444-08 Standard Test Method for Laboratory Standardization and Calibration of Hand-Held Moisture Meters (Redline)

Published By	Publication Date	Number of Pages
ASTM	2008	19

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Description

Significance and Use

Hand-held meters provide a rapid means of sampling MC of wood-based materials during and after processing to maintain quality assurance and compliance with standards. These measurements are influenced by actual MC, a number of other wood variables, environmental conditions, geometry of the measuring probe circuitry, and design of the meter. The maximum accuracy can only be obtained by an awareness of the effect of each parameter on the meter output and correction of readings as specified by this test method.

This test method employs controlled conditions and straight-grain, clear wood specimens to provide measurements that are reproducible in a laboratory. The controlled conditions prevent moisture and temperature gradients in the test specimen.

In laboratory calibration, the reference direct moisture measurements (for example, Test Methods D 4442) shall be made only in the area of direct measurement of the meter. This minimizes error associated with sampling of differing areas of measurement between this test method and that of the reference (Test Methods D 4442).

Most uses of hand-held moisture meters employ correlative (predictive) relationships between the meter reading and wood areas or volumes that exceed that of the direct meter measurement (for example, larger specimens, pieces of lumber, or lots). These correlative relationships are beyond the scope of this test method. (See Practice D 7438.)

1. Scope

1.1 This test method applies to the measurement of moisture content (MC) of solid wood products, including those containing additives (that is, chemicals or adhesives) for laboratory standardization and calibration of hand-held moisture meters

1.2 This test method makes no distinction between meter measurement technologies for standardization and calibration requirements. Provision is made for test specimen size to accommodate specific meters. Appendix X1 provides an explanatory discussion and history corresponding to the mandatory sections. Fundamental measurement technologies are described in Appendix X2 when available.

1.2.1 Meters employing differing technologies may not provide equivalent readings under the same conditions. When this test method has been applied, it is assumed that the referenced meter is acceptable unless otherwise specified. Meters shall be calibrated with respect to MC by direct measurement as determined by Test Methods D 4442.

1.3 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1990 Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products D4442 Test Methods for Direct Moisture Content Measurement of Wood and Wood-Base Materials D4933 Guide for Moisture Conditioning of Wood and Wood-Based Materials D5536 Practice for Sampling Forest Trees for Determination of Clear Wood Properties D7438 Practice for Field Calibration and Application of Hand-Held Moisture Meters

Other ASTM Sources

ASTMStandardsonPreci 1992

Keywords

Calibration; Conductance meters; Dielectric meters; Electrical measurements; Hand-held moisture meters; Metering system; Moisture analysis–wood products; Sampling wood products

ICS Code

DOI: 10.1520/D4444-08 ASTM International is a member of CrossRef.

ASTM D4444 (Wood Standards)

Citing ASTM Standards

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Additional information

Standard Title	D4444-08 Standard Test Method for Laboratory Standardization and Calibration of Hand-Held Moisture Meters (Redline)
Published Code	ASTM
Publication Date	2008
Pages Count	19

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ASTM-D4444 2008(Redline)

ASTM D4444 (Wood Standards)

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