---
title: Hazardous Area Hydrogen Analyser | Sarvesh
url: https://www.sarveshanalytics.com/hazardous-hydrogen-gas-analyser.html
description: ACCURRA-Hz hydrogen measurement in the background of N2, air or O2 for purge and reaction safety in classified areas.
updated: 2026-11-03
source: html
---

ACCURRA-Hz · Hydrogen

# Hazardous-area hydrogen analyser for purge and reaction safety

ACCURRA-Hz model 1030 measures hydrogen from 0 to 100 percent in nitrogen by thermal conductivity, in a flameproof enclosure for classified areas. Other background gases are available on request.

- 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-Hz measures percent or purity hydrogen in a thermal conductivity housing for classified areas, in a known background of nitrogen, air or oxygen. The enclosure is certified for Gas Group IIC, Zone 1 and 2, T6. No SIL claim is made.

Updated 3 November 2026 · Figures from Sarvesh datasheets

## Specifications

| Item | Specification | Notes |
|---|---|---|
| Measurement | Hydrogen 0 to 100 % in N2 (min 0 to 5 %) | Thermal conductivity, model 1030 |
| Accuracy | Below 1 % of FS | Repeatability below 1 % of FS; T90 below 10 s at 0.6 LPM |
| Backgrounds | Nitrogen as standard | Other backgrounds and ranges on request |
| Enclosure | Gas Group IIC, Zone 1 and 2, T6 | As per IS/IEC 60079-1:2014 |
| Calibration | Without opening covers |  |

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

- Thermal conductivity hydrogen measurement in a certified enclosure
- Alarm relays for purge permissives
- Modbus and 4-20 mA outputs

## How it works

Hydrogen is lighter than air and flammable over a wide range, so hydrogen areas are classified and every measurement in them must use certified equipment. Typical measurements are hydrogen in nitrogen at purge, hydrogen in oxygen in electrolysers, and hydrogen purity in reaction loops.

A thermal conductivity reading assumes a known binary mixture. Tell us the background and any variable third gas; we will choose the sensor and conditioning.

## Requirements and limits

- Confirm certificate scope for your classification; no SIL claim is made.

## On site: utilities and calibration gases

What to have ready at your plant before installation and commissioning.

| Item | Requirement | Notes |
|---|---|---|
| Power at the analyser | 24 V DC, 30 W, or 230 V AC |  |
| Zero gas | Zero-grade nitrogen, 99.9999 % | 10 litre cylinder with regulator |
| Span gas, trace oxygen | 1000 ppm oxygen in nitrogen | 10 litre cylinder with regulator |
| Span gas, 3090 | Zero-grade oxygen; zero on zero-grade nitrogen |  |
| Span gas, 3190 | Zero-grade oxygen; zero on 95 % oxygen in nitrogen |  |
| Instrument air and service nitrogen | 4 kg/cm² minimum |  |
| Mounting | Wall mounted in the classified area | Calibration without opening the covers |

## Selection guidance

Choose ACCURRA-Hz where hydrogen is measured inside the classified area. For safe-area hydrogen analysis see ACCURRA-TCD.

## Applications

Application pages where this is part of the recommended solution:

- [Electrolyser safety and quality](https://www.sarveshanalytics.com/applications/hydrogen-electrolyser-gas-analysis.html)
- [Reactors, hydrogenation and polymerisation](https://www.sarveshanalytics.com/applications/chemical-reactor-hydrogenation-trace-oxygen.html)
- [Float glass bath atmosphere](https://www.sarveshanalytics.com/applications/float-glass-bath-and-furnace-atmosphere.html)

## Compatible products

[

### 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)[

### 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)[

### 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 backgrounds?**

Nitrogen as standard; ask us for other background gases.

**Does it need a reference gas?**

No, it uses thermal conductivity.

**Can I calibrate without opening the cover?**

Yes.

**Does it have a SIL rating?**

We make no SIL claim.

## Related pages

- [ACCURRA-S](https://www.sarveshanalytics.com/safe-gas-analyser.html)
- [ACCURRA-S oxygen analysers](https://www.sarveshanalytics.com/oxygen-gas-analyser.html)
- [ACCURRA-S carbon monoxide analysers](https://www.sarveshanalytics.com/carbon-monoxide-gas-analyser.html)
- [ACCURRA-S carbon dioxide analysers](https://www.sarveshanalytics.com/carbon-dioxide-gas-analyser.html)
- [ACCURRA-S methane analyser](https://www.sarveshanalytics.com/methane-gas-analyser.html)
- [ACCURRA-S M015 moisture analyser](https://www.sarveshanalytics.com/trace-moisture-analyser.html)
- [ACCURRA-Hz](https://www.sarveshanalytics.com/hazardous-gas-analysers.html)
- [Hazardous-area oxygen analyser](https://www.sarveshanalytics.com/hazardous-oxygen-analyser.html)
- [INFINITY-Tx](https://www.sarveshanalytics.com/oxygen-transmitter.html)
- [Hazardous-area moisture analyser](https://www.sarveshanalytics.com/hazardous-moisture-analyser.html)
- [ACCURRA-Zr](https://www.sarveshanalytics.com/flue-gas-analysers.html)
- [ACCURRA model numbers](https://www.sarveshanalytics.com/accurra-model-numbers.html)
- [**Browse all gas analysers**](https://www.sarveshanalytics.com/gas-analyser.html)