1.1 这些测试方法适用于设计用于检测或测量干燥到纤维饱和点以下的木材中水分的仪器。这些测试的目的是提供一个统一的标准，根据该标准，此类系统可以证明其适用于其预期用途（见 附录X1 ). 1.1.1 这些方法没有解决对薄层表面水分的敏感性问题，例如露水或短暂降雨引起的敏感性问题。某些应用，如表面附着力筛选材料，需要额外的评估方法和标准（见 附录X5 ). 1.2 该标准配置为支持湿度计制造商以及此类系统的最终用户的测试，因此本文遵循两个轨道（参见 附录X2 ). 1.3 为制造商指定的测试方法通常是为实验室设置而设计的，旨在提供一个标准，制造商根据该标准认证校准和一般系统一致性。 1.4 最终用户的测试方法通常是为现场设置而设计的，旨在作为一套标准化程序，用于确定特定机器对特定用途的适用性。 1.5 使用在线仪表输出的木材标记或分拣系统等应用不属于本标准的一部分。 1.6 需要敏感和识别局部潮湿区域的应用仅限于一般建议。湿点的存在是 附录X8 . 1.7 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.8 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.9 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 在线仪表提供了一种快速检测木材或木制品在加工过程中（即在连续生产线上）水分含量的方法。两个主要用途是监测干燥过程的性能（空气干燥、窑炉干燥），并在预定的含水量水平下对材料进行分类或识别。这些测量是推断的，即进行物理测量并与校准曲线进行比较，以获得水分含量的间接测量。 这些测量值受一个或多个物理特性的影响，例如实际含水量（平均值和梯度；参见 附录X5 )木材的密度、表面水分、化学成分、尺寸和温度。此外，测量还受到环境条件和仪表设计规范的影响。通过了解每个参数对仪表输出的影响，并按照这些测试方法的规定校正读数，可以获得最佳性能。 4.2 这些测试方法的两个主要预期用户是主要关注实验室标准化和校准的仪器制造商和主要关注现场标准化和校准的仪器所有者。这些测试方法将实验室和现场呈现为单独的轨道（参见 附录X2 ). 4.2.1 实验室标准化和校准- 本部分试验方法旨在为设备制造商提供指导。具体的测试建议是根据实验室环境的能力量身定制的。 4.2.2 现场标准化和校准- 在线仪表的主要用途是在生产中，其中木材特性和环境条件反映了实际的加工过程。现场标准化和校准对于解决或涵盖生产中的许多可变性至关重要。 注1: 使用在线水分仪输出的应用可以修改流量计输出信号或具有不代表流量计的固有响应特性。

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 ). 1.1.1 Sensitivity to thin layers of surface moisture such as caused by dew or brief rain exposure is not addressed by these methods. Certain applications, such as screening material for surface adhesion, require additional assessment methodology and criteria (see Appendix X5 ). 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 Applications requiring sensitivity to and identification of localized wet areas are limited to general recommendations. The presence of wet-spots is the subject of Appendix X8 . 1.7 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.8 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 In-line meters provide a rapid means of detecting moisture content of lumber or wood products in processing (that is, on a continuous production line). Two major uses are monitoring the performance of the drying process (air drying, kiln drying), and providing sorting or identification of material at predetermined levels of moisture content. These measurements are inferential in the sense that physical measurements are made and compared against calibration curves to obtain an indirect measure of moisture content. These measurements are influenced by one or more physical properties such as actual moisture content (average and gradient; see Appendix X5 ), density, surface moisture, chemical composition, size, and temperature of wood. In addition, the measurements are also influenced by environmental conditions and the design specifications of the meter. The best performance is obtained by an awareness of the effect of each parameter on the meter output and correction of readings as specified by these test methods. 4.2 The two major anticipated users of these test methods are instrument manufacturers whose primary concern is laboratory standardization and calibration, and instrument owners whose primary concern is field standardization and calibration. These test methods present the laboratory and the field as separate tracks (see Appendix X2 ). 4.2.1 Laboratory Standardization and Calibration— This portion of these test methods is intended for guidance of equipment manufacturers. Specific test recommendations are tailored to the capabilities of a laboratory environment. 4.2.2 Field Standardization and Calibration— The predominant use of in-line meters is in production in which lumber characteristics and environmental conditions reflect actual mill processes. Field standardization and calibration is essential to address or encompass much of the variability in production. Note 1: Applications using the output of the in-line moisture meter can modify the meter output signals or have inherent response characteristics that are not representative of the meter.