--- title: Online Methane (CH4) Analyser | Sarvesh url: https://www.sarveshanalytics.com/methane-gas-analyser.html description: ACCURRA-S NDIR methane analyser, 0 to 100 percent, for biogas, process gas and gas purity. Dual-gas CO2 and CH4 option. updated: 2026-11-03 source: html --- ACCURRA-S model 4030 # Online methane (CH4) analyser with NDIR sensor, 0 to 100 percent ACCURRA-S 4030 measures methane from 0 to 100 percent, with a minimum range of 0 to 5 percent, using non-dispersive infrared. It pairs with CO2 on model 6030 in one dual-channel enclosure. - 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 ACCURRA-S 4030 measures methane from 0 to 100 %, with a minimum range of 0 to 5 %, by NDIR and a sensor life above five years. It can share an enclosure with CO2 for biogas. Methane is flammable, so area and sample are reviewed. Updated 3 November 2026 · Figures from Sarvesh datasheets ## Specifications | Item | Specification | Notes | |---|---|---| | 4030 | 0 to 100 % (min 0 to 5 %) | NDIR, sensor life above 5 years | | Resolution | 0.01 % | | | Accuracy | 2 % of FS | Repeatability 2 % of reading; T90 below 45 s | | Dual-gas | CO2 with CH4, percent | Independent outputs and Modbus ID | From the current Sarvesh product datasheets and company profile. Specifications may change without notice as products improve. The final responsibility to check that a product meets the process and analyser requirement remains with the customer. ## Key features - Calibration history and password protection - Isolated 4-20 mA with dual range - Modbus RTU for remote monitoring ## How it works Methane absorbs infrared strongly, which makes NDIR the reliable choice across a wide range with excellent long-term stability. The wide range matters because the same analyser can read a few percent of methane in a purge check or nearly 100 percent in upgraded biogas. Typical uses are biogas and CBG plants, gas purity checks, process gas and furnace atmospheres that contain methane. ## Requirements and limits - Safe-area analyser; review flammable samples with us before ordering. ## On site: utilities and calibration gases What to have ready at your plant before installation and commissioning. | Item | Requirement | Notes | |---|---|---| | Power at the analyser | 100 to 240 V AC, 50/60 Hz, 45 W | | | Zero gas | Zero-grade nitrogen, 99.9999 % | 10 litre cylinder with regulator | | Span gas | Zero-grade CH₄, 99.999 % | 10 litre cylinder with regulator | | Sample at the analyser | 2 to 10 psig, about 1 LPM, 5 to 45 °C, dust below 3 micron | Pressure and flow regulated by the user | | Mounting | 19 inch rack or panel, in a safe area | | ## Selection guidance Choose 4030 for methane in biogas, natural gas blending checks and carbon-bearing furnace atmospheres. Methane is flammable, so sample handling and installation need an area review; the catalogue sample specification asks for non-flammable samples. ## Applications Application pages where this is part of the recommended solution: - [Biogas and compressed biogas (CBG)](https://www.sarveshanalytics.com/applications/biogas-and-cbg-methane-co2-analysis.html) - [Heat-treatment furnace atmosphere](https://www.sarveshanalytics.com/applications/heat-treatment-furnace-atmosphere.html) - [Pyrolysis, gasification and syngas](https://www.sarveshanalytics.com/applications/pyrolysis-gasification-and-syngas.html) - [Gas purity certification and cylinder filling](https://www.sarveshanalytics.com/applications/gas-purity-certification-and-cylinder-filling.html) ## Compatible products [ ### ACCURRA-S Online analyser for trace, percent and purity O2, CO, CO2, CH4 and dew point; can measure two gases from one sample. View ACCURRA-S ](https://www.sarveshanalytics.com/safe-gas-analyser.html)[ ### Headline filters Particulate, coalescing and PTFE membrane filters from Headline Filters, UK, for analyser protection. View Headline filters ](https://www.sarveshanalytics.com/headline-filters.html)[ ### i-Cons Smart Peltier sample conditioner with diagnostics, auto blowback and Modbus, in a compact 19 inch cabinet. View i-Cons ](https://www.sarveshanalytics.com/smart-systems-for-gas-analyser.html) ## Frequently asked questions **What is the smallest range?** 0 to 5 percent. **Can I measure methane and CO2 together?** Yes, in a dual-gas ACCURRA-S, 4030 plus 6030. **Is it suitable for biogas with H2S?** Hydrogen sulphide is outside the standard sample specification. 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