---
title: Dual Gas CO2 and CH4 Analyser (%) | Sarvesh
url: https://www.sarveshanalytics.com/co2-and-ch4-analyser.html
description: ACCURRA-S dual-gas analyser for percent CO2 and methane in biogas and process gas. NDIR, independent outputs.
updated: 2026-11-03
source: html
---

ACCURRA-S dual channel

# Dual-gas CO2 and CH4 analyser for biogas and process gas

A dual-gas ACCURRA-S measures CO2 and methane in percent in one enclosure, with NDIR sensors, independent outputs and Modbus IDs.

- 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

A dual-gas ACCURRA-S measures percent CO2 (model 6030) and methane (model 4030) by NDIR in one enclosure, with independent outputs. It suits biogas and process gas, where wet or H2S-bearing samples need a conditioning review.

Updated 3 November 2026 · Figures from Sarvesh datasheets

## Specifications

| Item | Specification | Notes |
|---|---|---|
| CO2 | 0 to 20 % or 0 to 100 % | NDIR, model 6030 |
| CH4 | 0 to 100 % (min 0 to 5 %) | NDIR, model 4030 |
| Independence | Own electronics, outputs, relays and Modbus ID per channel |  |

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

- Independent electronics, microcontroller, 4-20 mA, relays and Modbus ID per sensor
- Common pneumatics and one fine filter
- Calibration history and password protection

## How it works

Methane and carbon dioxide make up nearly all of biogas, and their ratio shows digester health and upgrading performance. One enclosure reads both on one sample.

Biogas is wet, flammable and may carry hydrogen sulphide, so we review the sample specification and area classification for each project.

## Requirements and limits

- Safe-area analyser; the standard sample specification applies.

## Selection guidance

See the dual-gas analyser page for the full list of combinations.

## 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)
- [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)

## Frequently asked questions

**What sensors?**

NDIR for both gases.

**Is it suitable for H2S-bearing biogas?**

H2S needs a conditioning review; send the composition.

**Do I get separate outputs?**

Yes, independent 4-20 mA and Modbus ID per channel.

**What range for upgraded gas?**

0 to 100 percent methane.

## Related pages

- [Dual-gas analysers](https://www.sarveshanalytics.com/dual-gas-analyser.html)
- [Dual gas CO and CO2 (percent)](https://www.sarveshanalytics.com/co-and-co2-analyser.html)
- [Dual gas O2 and CO2 (percent)](https://www.sarveshanalytics.com/o2-and-co2-analyser.html)
- [Dual gas trace CO and CO2](https://www.sarveshanalytics.com/trace-co-and-co2-analyser.html)
- [Dual gas trace oxygen and moisture](https://www.sarveshanalytics.com/trace-oxygen-and-moisture-analyser.html)
- [**Browse all gas analysers**](https://www.sarveshanalytics.com/gas-analyser.html)