--- title: Flare Gas Recovery Oxygen Analyser | Sarvesh url: https://www.sarveshanalytics.com/applications/flare-gas-recovery-oxygen-ingress.html description: Flare gas recovery oxygen analyser with ACCURRA-Hz. Flare recovery can pull air into the gas header; oxygen monitoring protects downstream systems. Made in Pune. updated: 2026-11-02 source: html --- Pharma, chemicals and petrochemicals # Oxygen-ingress monitoring for flare gas recovery systems Flare recovery can pull air into the gas header; oxygen monitoring protects downstream systems. Sarvesh supplies ACCURRA-Hz, built in Pune, with sampling matched to the stream. - ISO 9001:2015, certified by TÜV - Designed and built in Pune since 2002 - Supplied to Reliance, Tata Steel, Indian Oil, Linde and ISRO Quick answer Use ACCURRA-Hz (hazardous oxygen). Flare recovery can pull air into the gas header; oxygen monitoring protects downstream systems. Hazardous area; confirm certificate for the zone. Updated 2 November 2026 · Figures from Sarvesh datasheets ## The measurement and why it matters Flare recovery can pull air into the gas header; oxygen monitoring protects downstream systems. This is a good fit, with one configuration or sample-handling point to confirm before we quote. Inerting and oxygen monitoring in flammable atmospheres exist to keep oxygen below a limit. The analyser is part of the safety philosophy, so the area classification, certificate and response requirements are settled first. ACCURRA-Hz uses an enclosure certified for Gas Group IIC, Zone 1 and 2, T6. We make no SIL claim today. If your project requires SIL-rated devices, tell us at the start and we will state point by point what we meet. Typical buyers in India: refineries and petrochemical plants. Where this matches your plant, send us the gas, range, pressure and temperature at the tapping point and we will confirm the analyser and sample path. ## Models and ranges | Model | Measures | Range | Sensor and notes | |---|---|---|---| | ACCURRA-Hz | Oxygen, hazardous area | Percent and trace | Gas Group IIC, Zone 1 and 2, T6 | ## Process notes ### What the analyser reads here Gases of interest: O2 in hydrocarbon gas. Analyser fit: ACCURRA-Hz (hazardous oxygen). The table above lists each model with its range; where a row says to confirm the range, we check it against the datasheet for your application before quoting. ### What to settle before ordering Hazardous area; confirm certificate for the zone. We would rather confirm these points at the start than discover them at commissioning, so please include them with your process details. ## Sampling and installation - Every ACCURRA-S has an internal fine filter and rotameter. Regulate sample pressure and flow externally; the catalogue recommends about 1 LPM and a sample pressure of 2 to 10 psig. - Keep sample lines short, clean and dry, and vent the sample somewhere safe. ## Send us your process data **What the data sheet asks for** Send what you have and we will ask for the rest. - The gases to measure, the range, and the accuracy you need - Background gases and their typical composition - Sample temperature, pressure and dew point at the tapping point - Dust level, and whether the gas carries tar, oil or condensable vapour - Process connection and, for ducts, the duct diameter - Where the sample vents to, and at what pressure - Area classification of the tapping point and of the analyser location, and the IP protection needed - Distance between the tapping point and the analyser - Outputs you need: 4-20 mA, dual range, relays, Modbus RTU - Calibration approach, calibration gas available, and whether blowback is required - Utilities at site: power supply, instrument air, nitrogen, steam and cooling water, and the ambient temperature range - Gases and ranges: O2 in hydrocarbon gas - The point to confirm: Hazardous area; confirm certificate for the zone. ## Recommended Sarvesh products [ ### ACCURRA-Hz Certified enclosure for Gas Group IIC, Zone 1 and 2, T6. View ACCURRA-Hz ](https://www.sarveshanalytics.com/hazardous-gas-analysers.html) ## Frequently asked questions **Which analyser suits flare-gas recovery oxygen ingress?** ACCURRA-Hz (hazardous oxygen) Flare recovery can pull air into the gas header; oxygen monitoring protects downstream systems. **What should I check before ordering for flare-gas recovery oxygen ingress?** Hazardous area; confirm certificate for the zone. **Who typically needs this?** Typical buyers in India: refineries and petrochemical plants. **Can Sarvesh support a variation of this application?** Yes. If your process differs from the usual case, send the details. Application engineering is where we start every project, and bespoke applications are welcome. ## Further reading - [Oxygen ingress through flare gas recovery systems](https://www.chromatographytoday.com/article/measurement-and-testing/14/qa3/unintended-introduction-of-oxygen-into-gas-export-systems-as-a-result-of-the-use-of-flare-gas-recovery-systems/3254) ## More in Pharma, chemicals and petrochemicals - [Nitrogen blanketing and inerting](https://www.sarveshanalytics.com/applications/nitrogen-blanketing-and-inerting.html) - [Reactors, hydrogenation and polymerisation](https://www.sarveshanalytics.com/applications/chemical-reactor-hydrogenation-trace-oxygen.html) - [Closed-loop dryers and spray dryers](https://www.sarveshanalytics.com/applications/closed-loop-and-spray-dryer-oxygen-safety.html) - [Fermenter and bioreactor off-gas](https://www.sarveshanalytics.com/applications/fermenter-and-bioreactor-off-gas.html) - [Pyrolysis, gasification and syngas](https://www.sarveshanalytics.com/applications/pyrolysis-gasification-and-syngas.html) - [Autoclaves](https://www.sarveshanalytics.com/applications/autoclave-oxygen-measurement.html) - [Dust-collector, mill and silo inerting](https://www.sarveshanalytics.com/applications/dust-collector-mill-and-silo-inerting.html) - [Solvent-recovery and distillation columns under inert gas](https://www.sarveshanalytics.com/applications/solvent-recovery-and-distillation-columns-under-inert-gas.html) - [**All pharma, chemicals and petrochemicals applications**](https://www.sarveshanalytics.com/industries/pharmaceutical-chemical-petrochemical-gas-analysers.html) - [Browse analysers by gas](https://www.sarveshanalytics.com/gas-analyser.html)