Standard Practice for Field Calibration and Application of Hand-Held Moisture Meters

Importancia y uso:

4.1 Hand-held meters provide a rapid means of sampling moisture content of wood-based materials during and after processing to maintain quality assurance and compliance with standards. However, these measurements are inferential; that is, electrical parameters are measured and compared against a calibration to obtain an indirect measure of moisture content. The electrical measurements are influenced by actual moisture content, 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 these test methods. Appendix X1 is a commentary that provides explanation of the mandatory sections and discussion of historical practices. Appendix X2 addresses the influence of process and wood variables.

4.1.1 This practice provides for calibration and application of wood products that contain commercial characteristics and that reflect the manufacturing environment.

4.2 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, lots). The field calibration section of this practice anticipates the potential need for this type of sampling. These correlative uses are examined in Appendix X3.

Subcomité:

D07.01

Referida por:

D1666-22, D4761-19, E2579-23B, D6570-18AR23E01, D7147-21, D0198-22A, D4761-19, D6958-20, D4444-25, E2126-25, E3053-18E02, D7469-24, D6874-22A, D7954_D7954M-22A, E0072-22, D2395-17R22, D0198-22A

Volúmen:

04.10

Número ICS:

79.040 (Wood, sawlogs and sawn timber), 79.080 (Semi-manufactures of timber), 79.120.99 (Other woodworking equipment)