1.1 本指南适用于含有测试流体并在-100℃温度范围内工作的受控温度比较槽 °C至550 °C。 1.2 本指南描述了用于通过比较法校准温度计的受控温度流体浴的基本特征。 1.3 本指南不涉及控制温度流体浴的设计和施工细节。 1.4 本指南描述了一种定义浴缸工作空间并评估该空间内温度变化的方法。理想情况下，工作空间将尽可能接近等温。 1.5 本指南不涉及定点浴、冰点浴或蒸汽浴。 1.6 本指南不涉及流化粉末浴。 1.7 本指南不涉及编程为改变温度的浴池。 1.8 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.9 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.10 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 受控温度浴的设计将决定哪些温度计可以校准，以及在多大程度上达到等温条件。熔池缺乏热稳定性和均匀性是导致整体校准不确定度的误差来源。 5.2 本指南描述了确定受控温度流体浴槽有效工作空间的程序。 5.3 本指南描述了确定受控温度流体浴内热稳定性的程序。整体热稳定性由浴设备制造商规定的浴性能组成，并作为校准不确定度的组成部分。 5.4 本指南描述了确定受控温度流体浴槽工作空间温度均匀性的程序。

1.1 This guide is intended for use with controlled temperature comparison baths that contain test fluids and operate within the temperature range of –100 °C to 550 °C. 1.2 This guide describes the essential features of controlled temperature fluid baths used for the purpose of thermometer calibration by the comparison method. 1.3 This guide does not address the details on the design and construction of controlled-temperature fluid baths. 1.4 This guide describes a method to define the working space of a bath and evaluate the temperature variations within this space. Ideally, the working space will be as close as possible to isothermal. 1.5 This guide does not address fixed point baths, ice point baths, or vapor baths. 1.6 This guide does not address fluidized powder baths. 1.7 This guide does not address baths that are programmed to change temperature. 1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.9 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. 1.10 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 ====== 5.1 The design of a controlled temperature bath will determine what thermometers can be calibrated and to what extent an isothermal condition is achieved. The lack of thermal stability and uniformity of the bath are sources of error that contribute to the overall calibration uncertainty. 5.2 This guide describes a procedure for determining the effective working space for a controlled temperature fluid bath. 5.3 This guide describes a procedure for determining the thermal stability within a controlled temperature fluid bath. Overall thermal stability is composed of the bath performance as specified by the manufacturer of the bath equipment and as a component of calibration uncertainty. 5.4 This guide describes a procedure for determining the temperature uniformity of the working space of the controlled temperature fluid bath.