Primary references
Sources and standards
We prioritize standards organizations and the organizations responsible for the technologies or metrology frameworks described on this site.
Measurement uncertainty and metrology
- BIPM / JCGM publications: JCGM 100:2008, Guide to the Expression of Uncertainty in Measurement (GUM), plus newer companion guidance including GUM-1:2023. The JCGM publications page also lists a 2026 amendment to JCGM 100 covering nonlinearity in measurement models. BIPM/JCGM.
Instrumentation symbols and identification
- ANSI/ISA-5.1-2024: Instrumentation and Control — Symbols and Identification. ISA states that it provides a standardized system for depicting and identifying instruments, devices and their functions. ISA-5 series.
HART communication
- FieldComm Group — HART: official overview of bidirectional HART communication between intelligent field instruments and host systems. HART.
- FieldComm Group — WirelessHART: official overview of HART-based wireless mesh communication for process automation. WirelessHART.
Functional safety
- IEC 61511 series: Functional safety — Safety instrumented systems for the process industry sector. IEC 61511 series.
External organizations are cited as sources only. This website is not affiliated with or endorsed by BIPM, JCGM, ISA, IEC or FieldComm Group.