The Comitato Elettrotecnico Italiano website.
Specifically, outlines how to structure data exchange between a legacy relay interface and a new PLC. The practical utility here is the concept of the "black channel" —assuming the communication medium is unreliable and building safety logic on top of it using standardized function blocks (FBs) from Part 3. For an engineer in the field, this provides a ready-made checklist: define your fail-safe values, implement cyclic redundancy checks (CRCs) as per Annex B, and separate watchdog timers from application logic.
"Explosive atmospheres - Guide for classification of hazardous areas for the presence of gas in application of CEI EN 60079-10-1". cei 31-35 pdf
Areas prone to methane accumulation, such as digesters and pump stations.
Available in hardcopy and PDF formats, primarily in Italian. Intertek Inform Where to Access the PDF The Comitato Elettrotecnico Italiano website
Before a zone can be classified, safety engineers must pinpoint every potential point of release (e.g., valves, flanges, pumps, or vents) and categorize them into three grades:
Engineering firms and HSE (Health, Safety, and Environment) managers rely on the CEI 31-35 PDF for several reasons: For an engineer in the field, this provides
Old versions permitted certain plastic cable glands in Zone 1. New flame tests (IEC 60079-0:2017, Annex G) require specific low-temperature impacts. A free PDF from 2010 would steer you wrong.
