Standard Test Method for Laboratory Standardization and Calibration of Hand-Held Moisture Meters

Importancia y uso:

4.1 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.

4.1.1 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.

4.1.2 In laboratory calibration, the reference direct moisture measurements (for example, Test Methods D4442) 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 D4442).

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, or lots). These correlative relationships are beyond the scope of this test method. (See Practice D7438.)

Subcomité:

D07.01

Referida por:

B0900-16R22, D7446-09R17, D6254_D6254M-20, E2579-23B, C1789-24, E2632_E2632M-20, E2707-22, E0603-25, G0198-17R23, E2957-17R24, D7438-20R25, D6573_D6573M-13R20, E0108-25, D6199-18AR24E01, D1185-98AR25, D6782-19R25, D6874-22A, E0084-24, D1990-25

Volúmen:

04.10

Número ICS:

79.080 (Semi-manufactures of timber), 79.120.99 (Other woodworking equipment)

Palabras clave:

moisture content; moisture meter; calibration; wood; wood-based materials;