---
title: Hazardous Area Oxygen Analyser | Sarvesh
url: https://www.sarveshanalytics.com/hazardous-oxygen-analyser.html
description: ACCURRA-Hz oxygen analyser for classified areas: trace ppm, percent or purity in various background gases.
updated: 2026-11-03
source: html
---

ACCURRA-Hz · Oxygen

# Hazardous-area oxygen analyser: trace ppm, percent and purity

ACCURRA-Hz measures oxygen in classified areas: trace ppm, percent or purity, with the sensor chosen by the background gas. INFINITY-Tx is the loop-powered transmitter for percent oxygen at the field.

- 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

For oxygen in classified areas, ACCURRA-Hz measures trace ppm, percent or purity oxygen with the sensor chosen for the background gas, and INFINITY-Tx is a loop-powered transmitter for percent oxygen at the vessel. Confirm certificate scope for your zone.

Updated 3 November 2026 · Figures from Sarvesh datasheets

## Specifications

| Item | Specification | Notes |
|---|---|---|
| Measurement | Trace, percent or purity oxygen | Sensor chosen by the background gas |
| Enclosure | Gas Group IIC, Zone 1 and 2, T6 | As per IS/IEC 60079-1:2014 |
| Calibration | Without opening covers |  |
| Purity | Ambient pressure and temperature compensated |  |

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

- Panel analyser for ppm and percent oxygen
- Transmitter version for field mounting
- Alarm relays and outputs for interlocks

## How it works

Oxygen is the key safety variable wherever flammable gas or vapour is present. Too much oxygen in a blanketed vessel makes it flammable, oxygen in a hydrogen loop is a hazard and a catalyst poison, and oxygen in a solvent dryer sets whether it can be heated.

ACCURRA-Hz covers the ppm and percent ranges in classified areas, and INFINITY-Tx puts a two-wire percent oxygen transmitter on a vessel or vent. Send the background gas, range, pressure and zone.

## Requirements and limits

- Confirm current certificate scope against your classification.

## 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 when you need ppm levels or several outputs, and INFINITY-Tx for percent oxygen at the vessel.

## Applications

Application pages where this is part of the recommended solution:

- [Autoclaves](https://www.sarveshanalytics.com/applications/autoclave-oxygen-measurement.html)
- [Reactors, hydrogenation and polymerisation](https://www.sarveshanalytics.com/applications/chemical-reactor-hydrogenation-trace-oxygen.html)
- [Nitrogen blanketing and inerting](https://www.sarveshanalytics.com/applications/nitrogen-blanketing-and-inerting.html)
- [Closed-loop dryers and spray dryers](https://www.sarveshanalytics.com/applications/closed-loop-and-spray-dryer-oxygen-safety.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)[

### INFINITY-Tx

Loop-powered two-wire transmitter for percent O2 and trace CO in hazardous areas. View INFINITY-Tx

](https://www.sarveshanalytics.com/oxygen-transmitter.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

**Which sensor does it use?**

Chosen by the background gas and range; send your gas composition.

**Can it measure trace oxygen?**

Yes, in ppm.

**Is there a transmitter?**

INFINITY-Tx, loop powered, for percent oxygen.

**Do you have certificates?**

Ask us for current copies.

## 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)
- [INFINITY-Tx](https://www.sarveshanalytics.com/oxygen-transmitter.html)
- [Hazardous-area hydrogen analyser](https://www.sarveshanalytics.com/hazardous-hydrogen-gas-analyser.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)