
| Website | https://instrumentationtools.com/ |
| Website | https://instrumentationtools.com/ |

Distributed Control Systems (DCS) | Industrial Automation Basics
👉👉 WATCH VIDEO: https://youtu.be/rnsP-r1a_DQ



🛠️ Proof Test Interval (PTI) — Small Parameter, Big Impact on SIL
You can design a perfect safety loop…
But without proper testing, its reliability degrades over time 👇
⚙️ What is PTI?
➡️ Proof Test Interval (PTI)
➡️ Time between two proof tests of a safety function
➡️ Ensures hidden failures are detected and corrected
🧠 Simple idea
👉 Longer PTI → More undetected failures
👉 Shorter PTI → Higher safety reliability
🔍 Why PTI is critical
⚡ Directly affects PFD (Probability of Failure on
