---
title: TCD Nitrous Oxide (N2O) Analyser | Sarvesh
url: https://www.sarveshanalytics.com/nitrous-oxide-gas-analyser.html
description: Online nitrous oxide analyser based on thermal conductivity for binary mixtures, with no reference gas.
updated: 2026-11-03
source: html
---

ACCURRA-TCD · Nitrous oxide

# Online nitrous oxide (N2O) analyser based on thermal conductivity

ACCURRA-TCD lists nitrous oxide among the gases it measures in binary mixtures, with a platinum sensor and 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 lists nitrous oxide among the gases it measures in binary mixtures, by thermal conductivity with no reference gas. N2O in helium or hydrogen works well, but N2O with carbon dioxide or argon is poor, so send the composition first.

Updated 3 November 2026 · Figures from Sarvesh datasheets

## Specifications

| Item | Specification | Notes |
|---|---|---|
| Gas | Nitrous oxide in a binary mixture |  |
| Sensor | Platinum thermal conductivity |  |
| Repeatability | Below 1 % of full scale | Linearity below 1 % of range |
| Errors and drift | Below 1 % of full scale per week |  |
| Response time | T90 below 10 s at 0.6 LPM |  |
| Reference gas | Not required |  |

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

- Binary N2O measurement
- Isolated 4-20 mA, programmable alarms, Modbus RTU
- No reference gas

## How it works

Nitrous oxide conducts heat about as poorly as carbon dioxide and argon, much less than hydrogen or helium and somewhat less than nitrogen or oxygen. Nitrous oxide in helium or hydrogen gives a large signal. Nitrous oxide in nitrogen or oxygen gives a smaller but usable one.

Because carbon dioxide and argon are similar, a mixture containing N2O with either of them is difficult for any thermal conductivity analyser. Tell us the full composition. Every application of this analyser needs a binary mixture of known background.

## Requirements and limits

- Binary mixtures only; N2O with CO2 or argon is difficult.

## 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 N2O as the variable component of a binary mixture. Please enquire first, because the range, background and required accuracy decide whether the method fits.

## Applications

Application pages where this is part of the recommended solution:

- [Gas purity certification and cylinder filling](https://www.sarveshanalytics.com/applications/gas-purity-certification-and-cylinder-filling.html)
- [Aerospace, nuclear and research laboratories](https://www.sarveshanalytics.com/applications/aerospace-nuclear-and-research-labs.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-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

**Does it need a reference gas?**

No.

**Can it measure N2O in CO2?**

Their conductivities are close, so please enquire.

**Which backgrounds are listed?**

Nitrogen or oxygen, on 0 to 100, 0 to 5 or 96 to 100 percent ranges.

**Who should I contact?**

Send the composition, range and accuracy you need and we will review.

## Related pages

- [ACCURRA-TCD](https://www.sarveshanalytics.com/binary-tcd-thermal-conductivity-analysers.html)
- [ACCURRA-TCD hydrogen analyser](https://www.sarveshanalytics.com/hydrogen-gas-analyser.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)
- [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)