--- title: HNX Hydrogen in Nitrogen Analyser | Sarvesh url: https://www.sarveshanalytics.com/applications/continuous-annealing-and-galvanising-line-atmospheres-hnx.html description: Hnx hydrogen in nitrogen analyser with ACCURRA-TCD. Hydrogen in nitrogen at a few percent is a classic binary measurement. Made in Pune. updated: 2026-11-02 source: html --- Steel, heat treatment and furnaces # Hydrogen-in-nitrogen analysis for continuous annealing and galvanising lines Hydrogen in nitrogen at a few percent is a classic binary measurement. Sarvesh supplies ACCURRA-TCD, 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-TCD. Hydrogen in nitrogen at a few percent is a classic binary measurement. Moisture and dust at the furnace take-off. Updated 2 November 2026 · Figures from Sarvesh datasheets ## The measurement and why it matters Hydrogen in nitrogen at a few percent is a classic binary measurement. This application matches the catalogue specification directly. In furnaces, chambers and dry rooms the atmosphere is part of the recipe. A few ppm of oxygen, a dew point or a hydrogen share decides surface finish, yield or safety, and a leak or a drifting gas supply shows up in the analyser before it shows up in the product. These atmospheres are usually clean at the analyser but can be hot, sooty or particulate-laden at the furnace take-off. Sample from the right point, keep lines short and use dry stainless tubing. Tell us the furnace or chamber volume and flow so we can confirm the sample path. Typical buyers in India: steel strip lines, tinplate (Tinplate Company is an existing customer), CRCA. 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-TCD | Binary gas analysis (H2 in N2) | Binary mixtures | Thermal conductivity, no reference gas | ## Process notes ### What the analyser reads here Gases of interest: H2 in N2. Analyser fit: ACCURRA-TCD. 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 Moisture and dust at the furnace take-off. 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: - [Heat-treatment furnace atmosphere](https://www.sarveshanalytics.com/applications/heat-treatment-furnace-atmosphere.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. ## 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: H2 in N2 - The point to confirm: Moisture and dust at the furnace take-off. ## Recommended Sarvesh products [ ### ACCURRA-TCD Binary purity or percentage with no reference gas. View ACCURRA-TCD ](https://www.sarveshanalytics.com/binary-tcd-thermal-conductivity-analysers.html)[ ### SP and SRP sample probes Heated or retractable probes with blowback for dusty or hot gas. View SP and SRP sample probes ](https://www.sarveshanalytics.com/sample-probes.html)[ ### Headline filters Particulate and coalescing protection for the analyser. View Headline filters ](https://www.sarveshanalytics.com/headline-filters.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 continuous annealing and galvanising line atmospheres (HNX)?** ACCURRA-TCD Hydrogen in nitrogen at a few percent is a classic binary measurement. **What should I check before ordering for continuous annealing and galvanising line atmospheres (HNX)?** Moisture and dust at the furnace take-off. **Who typically needs this?** Typical buyers in India: steel strip lines, tinplate (Tinplate Company is an existing customer), CRCA. **Can Sarvesh support a variation of this application?** Yes. If your process differs from the usual case, send the details. 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