Standard for symbols of temperature instruments

At present, the main standards governing the symbols for temperature instruments in our country are: – GB/T 3369.1—2008 \"Safety requirements for electrical equipment used in measurement, control, and laboratory applications – Part 1: General requirements\"; – GB/T 12206—2006 \"Measurement and control in industrial processes – Functional indicators and graphic symbols for measurement and control devices.\" These standards specify the requirements regarding the identification symbols of temperature instruments. As for how to represent symbols when selecting instruments, it is generally recommended that: 1. Priority should be given to following **standard GB/T 12206 or relevant industry standards, such as HG/T 20507 in the chemical industry, in order to ensure consistency in industry practices ； 2. If the standards do not specify particular product models or detailed parameters, reference can be made to the manufacturer’s sample labels, with additional explanations provided in the notes of the selection documents or drawings to ensure clarity. In actual engineering projects, most companies or design institutes adopt **or industry standards for unified representation, and then refer to the manufacturer’s samples to confirm the specific models. .

HG/T 20505-2014 Functional indicators and graphic symbols for process measurement and control instruments

Is it asking about the instrument tag expression? Or the instrument purchase model?

The symbol for temperature instruments consists of a measurement point symbol plus a textual code (GB/T 2625 \"Graphic symbols and textual codes for process monitoring and control flowcharts\", HG/T 20505 \"Functional indicators and graphic symbols for process measurement and control instruments\"). The symbol for temperature instruments is also composed of a circle plus leads (GB/T 6567.4 \"Graphic symbols for piping systems in technical drawing\")