--- title: Digester Biogas Methane and CO2 Analyser url: https://www.sarveshanalytics.com/applications/sewage-treatment-plant-dairy-and-food-waste-digesters.html description: Digester gas analyser with ACCURRA-S 4030, 6030. Digester gas composition shows process health. Made in Pune. updated: 2026-11-02 source: html --- Hydrogen and new energy # Methane and CO2 analysis for sewage, dairy and food-waste digesters Digester gas composition shows process health. Sarvesh supplies ACCURRA-S 4030, 6030, 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-S 4030, 6030, CO2+CH4 dual. Digester gas composition shows process health. H2S and moisture; add conditioning. Updated 2 November 2026 · Figures from Sarvesh datasheets ## The measurement and why it matters Digester gas composition shows process health. This is a good fit, with one configuration or sample-handling point to confirm before we quote. Methane and CO2 in biogas show how healthy a digester or landfill is and how good the fuel is. Oxygen in the gas points to air ingress, which is both a quality and a safety concern. Raw biogas carries moisture and H2S, and landfill gas can carry other contaminants. Those are outside the standard sample limits, so we review the stream and add conditioning before an analyser is placed. These pages describe safe-area analysis. Typical buyers in India: municipal bodies, dairies, food processors, STP builders. 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 | |---|---|---|---| | 4030 | Methane | 0 to 100 % (min 0 to 5 %) | NDIR | | 6030 | Carbon dioxide | 0 to 20 % or 0 to 100 % | NDIR | ## Process notes ### What the analyser reads here Gases of interest: CH4, CO2. Analyser fit: ACCURRA-S 4030, 6030, CO2+CH4 dual. 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 H2S and moisture; add conditioning. We would rather confirm these points at the start than discover them at commissioning, so please include them with your process details. ## Related applications This page overlaps with: - [Biogas and compressed biogas (CBG)](https://www.sarveshanalytics.com/applications/biogas-and-cbg-methane-co2-analysis.html) ## 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. ACCURRA-S sample specification: non-corrosive, non-toxic, non-flammable, non-condensing and dry, free from entrained oil; sample pressure 2 to 10 psig, regulated externally; flow about 1 LPM; dust below 3 micron. Where your sample differs, we design conditioning around it. ## 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: CH4, CO2 - The point to confirm: H2S and moisture; add conditioning. ## Recommended Sarvesh products [ ### ACCURRA-S Trace, percent and purity analysis of O2, CO, CO2, CH4 and dew point. View ACCURRA-S ](https://www.sarveshanalytics.com/safe-gas-analyser.html)[ ### i-Cons Peltier conditioner for wet or condensing samples. View i-Cons ](https://www.sarveshanalytics.com/smart-systems-for-gas-analyser.html) ## Frequently asked questions **Which analyser suits sewage-treatment-plant, dairy and food-waste digesters?** ACCURRA-S 4030, 6030, CO2+CH4 dual Digester gas composition shows process health. **What should I check before ordering for sewage-treatment-plant, dairy and food-waste digesters?** H2S and moisture; add conditioning. **Who typically needs this?** Typical buyers in India: municipal bodies, dairies, food processors, STP builders. **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. ## More in Hydrogen and new energy - [Hydrogen purity](https://www.sarveshanalytics.com/applications/hydrogen-purity-analyser.html) - [Electrolyser safety and quality](https://www.sarveshanalytics.com/applications/hydrogen-electrolyser-gas-analysis.html) - [Biogas and compressed biogas (CBG)](https://www.sarveshanalytics.com/applications/biogas-and-cbg-methane-co2-analysis.html) - [Chlor-alkali hydrogen stream: oxygen in hydrogen](https://www.sarveshanalytics.com/applications/chlor-alkali-hydrogen-stream-oxygen-in-hydrogen.html) - [Landfill gas wells and flares](https://www.sarveshanalytics.com/applications/landfill-gas-wells-and-flares.html) - [Gas-engine gensets on biogas](https://www.sarveshanalytics.com/applications/gas-engine-gensets-on-biogas.html) - [**All hydrogen and new energy applications**](https://www.sarveshanalytics.com/industries/hydrogen-new-energy-gas-analysers.html) - [Browse analysers by gas](https://www.sarveshanalytics.com/gas-analyser.html)