This specification covers the requirements for temperature monitoring equipment for use in general applications. Such equipment shall be comprised of a temperature sensor in combination with a signal conditioner, a power supply, and a test device. Temperature sensors covered by this specification are divided into thermocouples, which measure direct or differential temperature, and resistance thermometers, which measure temperature changes based on changes in resistance of sensor element exposed to temperature. Each of these types of sensors may further be classified as follows. Thermocouples can be classified into three classes based on materials and temperature ranges: base metal, noble metal, and refractory metal. Resistance thermometers, on the other hand, can be classified according to the type of sensor element used: metal sensor element (resistance temperature detector or RTD) or semiconductor sensor element (thermistor). RTDs are available in various design configurations including averaging, annular, and combination RTD-thermocouple, while thermistors are classified based on the configuration of the semiconductor sensor element: bead, disc, washer, or rod. Qualification test shall be performed on the equipment and shall comply with the physical property and performance requirements specified.

1.1 This specification covers the requirements for equipment intended to provide control input and monitoring of temperatures in general applications. Equipment described in this specification includes temperature indicators, signal conditioners and power supplies, and temperature sensors such as thermocouples and resistance temperature element assemblies.

1.2 Special requirements for Naval shipboard applications are included in the Supplementary Requirements section.

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

1.4 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.