---
title: Learning Path: Gas Analyser Safety and Hazardous Areas
url: https://www.sarveshanalytics.com/learn/path-safety-and-hazardous-areas.html
description: An eight-lesson path on flammability, inerting, hazardous-area classification, protection concepts, SIL and oxygen hazards for gas analysis.
updated: 2026-11-03
source: html
---

Learn · Learning path

# Safety and hazardous areas

The vocabulary and the limits, so a hazardous-area specification is clear on both sides.

 8 lessons About 25 min For: Safety engineers, project engineers and anyone installing analysers where gas can burn or explode

## What you will be able to do

- Use flammability limits and LOC correctly
- Read a zone, gas group and temperature class
- Tell protection concepts apart
- State what SIL does and does not mean for an analyser
- Recognise oxygen enrichment and deficiency hazards

## Follow these lessons in order

1. [  **Flammability, explosive limits and gas safety basics** A flammable gas burns only when fuel, oxygen and an ignition source are present and the fuel-air mixture lies between the lower and upper explosive limits (LEL and UEL). Why gases burn.  Beginner*3 min*](https://www.sarveshanalytics.com/learn/flammability-explosive-limits-and-gas-safety-basics.html)
2. [  **What is limiting oxygen concentration (LOC)?** The limiting oxygen concentration (LOC) is the oxygen level below which a flammable vapour or dust cannot sustain a flame. Safe by removing oxygen.  Beginner*3 min*](https://www.sarveshanalytics.com/learn/what-is-limiting-oxygen-concentration.html)
3. [  **Inerting and purging: how they work and how to prove them** Inerting keeps a vessel's oxygen below the limiting oxygen concentration by filling it with nitrogen or another inert gas. How inerting is done and checked.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/inerting-and-purging-how-they-work.html)
4. [  **Hazardous area classification: zones, gas groups, T-Classes** Area classification says how likely an explosive atmosphere is (Zone 0, 1 or 2 for gas), what gas it could be (group IIA, IIB or IIC) and how hot equipment may get (T1 to T6, 450 to 85 C). The classification vocabulary.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/hazardous-area-classification-zones-gas-groups-temperature-classes.html)
5. [  **Protection concepts: flameproof, intrinsic safety, purging** Hazardous-area equipment avoids ignition in one of three ways: contain an explosion (flameproof, Ex d), prevent sparks and heat (increased safety Ex e, non-sparking Ex n or ec, encapsulation Ex m), or limit energy (intrinsic safety Ex i), or keep the gas out (pressurised or purged enclosures, Ex p). How equipment is made safe.  Advanced*3 min*](https://www.sarveshanalytics.com/learn/protection-concepts-flameproof-intrinsic-safety-and-purging.html)
6. [  **Hazardous area gas analysers explained** A hazardous area analyser is built so it cannot ignite flammable gas. Putting an analyser in a zone.  Intermediate*4 min*](https://www.sarveshanalytics.com/learn/hazardous-area-gas-analysers-explained.html)
7. [  **What SIL means for gas analysers, and what it does not** A safety integrity level (SIL 1 to 4) states how reliably a safety instrumented function does its job on demand. What a safety integrity level is.  Advanced*3 min*](https://www.sarveshanalytics.com/learn/what-sil-means-for-gas-analysers.html)
8. [  **Oxygen enrichment and oxygen deficiency hazards** Too much oxygen makes materials ignite more easily and burn fiercely; above about 23.5 % is commonly treated as oxygen-enriched. The hazard at both ends of the scale.  Beginner*3 min*](https://www.sarveshanalytics.com/learn/oxygen-enrichment-and-oxygen-deficiency-hazards.html)

Stuck on a real problem while you learn? [Ask an engineer](https://www.sarveshanalytics.com/contact.html#enquiry). Every lesson is checked against the figures in our catalogues.