--- title: TCD Hydrogen Gas Analyser | Sarvesh url: https://www.sarveshanalytics.com/hydrogen-gas-analyser.html description: Online hydrogen analyser with a platinum thermal-conductivity sensor and no reference gas. Part of the ACCURRA-TCD line. updated: 2026-11-03 source: html --- ACCURRA-TCD · Hydrogen # Online hydrogen gas analyser, platinum thermal conductivity, no reference gas ACCURRA-TCD is Sarvesh's thermal conductivity analyser line. For hydrogen, a platinum thermal conductivity sensor measures hydrogen from 0 to 100 percent, depending on the background gas, with no reference gas. - 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-TCD measures hydrogen from 0 to 100 %, depending on the background gas, with a platinum thermal conductivity sensor and no reference gas. Display resolution is 0.01 % and repeatability is better than 1 % of full scale. Updated 3 November 2026 · Figures from Sarvesh datasheets ## Specifications | Item | Specification | Notes | |---|---|---| | In nitrogen, air, CO2 or methane | 0 to 100 %, 0 to 3 % or 97 to 100 % | | | In argon | 0 to 100 %, 0 to 3 % or 97 to 100 % | | | In helium | 20 to 100 %, 20 to 40 % or 85 to 100 % | | | In oxygen | 0 to 100 %, 0 to 4 % or 97 to 100 % | | | Resolution | 0.01 % | | | Repeatability | Below 1 % of full scale | Linearity below 1 % of range | | Response time | T90 below 10 s at 0.6 LPM | | | Sample flow | 0.6 LPM recommended | | | Sample temperature | 5 to 45 C | | | Power | 100 to 240 V AC, 50/60 Hz, 45 W | | | Output | Isolated 4-20 mA, user-programmable range; Modbus RTU over RS 485 | Programmable relays for alarms, fault, pump or range ID, calibration | 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 - Dual-level password protection and history of alarms and calibrations - Programmable alarms Lo-Hi, Lo-Lo, Hi-Hi - Output freeze or follow during calibration ## How it works Hydrogen has the highest thermal conductivity of any gas, so a thermal conductivity sensor responds strongly to it. Platinum-based sensing avoids the need for a reference gas and holds calibration well. Typical uses are hydrogen production and filling, hydrogen purity in cooling of generators, metal processing and heat treatment atmospheres, and leak detection in safe-area enclosures. Response is fast, with T90 below 10 seconds at the recommended 0.6 LPM. ## Requirements and limits - Safe-area analyser; a single known background gas assumed. ## 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, 99.999 % | 10 litre cylinder with regulator | | Span gas | The measured gas at zero grade, 99.999 %: hydrogen, helium, argon or nitrous oxide | 10 litre cylinder with regulator | | Sample at the analyser | 2 to 10 psig, 0.6 LPM, 5 to 40 °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 ACCURRA-TCD for hydrogen in one known background gas in a safe area. For classified areas choose ACCURRA-Hz. ## Applications Application pages where this is part of the recommended solution: - [Cold rolling mill furnaces](https://www.sarveshanalytics.com/applications/cold-rolling-mill-furnace-atmosphere.html) - [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) - [Float glass bath atmosphere](https://www.sarveshanalytics.com/applications/float-glass-bath-and-furnace-atmosphere.html) ## Compatible products [ ### ACCURRA-TCD Thermal conductivity analyser for binary mixtures of H2, He, Ar, N2 and others, with no reference gas. View ACCURRA-TCD ](https://www.sarveshanalytics.com/binary-tcd-thermal-conductivity-analysers.html)[ ### ACCURRA-Hz Process gas analyser in an enclosure certified for Gas Group IIC, Zone 1 and 2, T6. View ACCURRA-Hz ](https://www.sarveshanalytics.com/hazardous-gas-analysers.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 range does it cover?** 0 to 100 percent hydrogen, or narrow ranges such as 0 to 3 or 97 to 100 percent; the ranges depend on the background gas. **Which backgrounds?** One of nitrogen, air, CO2, methane, argon, helium or oxygen. **Does it need a reference gas?** No. **Can I use it in a hazardous area?** Use ACCURRA-Hz. ## Related pages - [ACCURRA-TCD](https://www.sarveshanalytics.com/binary-tcd-thermal-conductivity-analysers.html) - [Helium analyser (TCD)](https://www.sarveshanalytics.com/helium-gas-analyser.html) - [Argon analyser (TCD)](https://www.sarveshanalytics.com/argon-gas-analyser.html) - [Nitrogen analyser (TCD)](https://www.sarveshanalytics.com/nitrogen-gas-analyser.html) - [Nitrous oxide analyser (TCD)](https://www.sarveshanalytics.com/nitrous-oxide-gas-analyser.html) - [Thermal conductivity gas analysers](https://www.sarveshanalytics.com/thermal-conductivity-gas-analyser.html) - [Binary gas mixtures for TCD](https://www.sarveshanalytics.com/binary-gas-mixtures-thermal-conductivity.html) - [ACCURRA-TCD applications](https://www.sarveshanalytics.com/accurra-tcd-applications.html) - [**Browse all gas analysers**](https://www.sarveshanalytics.com/gas-analyser.html)