Science Instruments

Ethylene Oxide Gas Analyzer

Picarro Ethylene Oxide Gas Analyzer Family

Picarro has responded to the growing concerns over Ethylene Oxide (EtO) toxicity and its lack of monitoring by developing an ethylene oxide gas analyzer family based on a new measurement platform. Current methods for measuring this harmful, but common industrial gas, have significant limitations including poor sensitivity (Fourier Transform Infrared Spectroscopy, FTIR), cross-talk with other common species (electrochemical sensors), high costs (Gas Chromatography-Mass Spectroscopy, GC-MS), and/or slow sampling intervals (GC). There is an urgent need to transition towards field durable, real-time systems, capable of reaching parts-per-trillion (ppt) levels of EtO detection.

Using innovative next-generation CRDS laser technology, Picarro has developed an ethylene oxide gas analyzer family capable of measuring ppt levels of EtO in real time (< 2 seconds) and without the need for chromatographic separation or pre-concentration. The ethylene oxide gas analyzer family is available as three standalone products:

Ethylene Oxide Gas Analyzer

G2910 Stack and Indoor Air Quality Analyzer

Ultra-precise, continuous measurements of EtO at the source of emission. Enables fast and efficient deployments over a range of applications.

Performance highlight: 

  • <250 ppt LOD
  • Optimized for complex gas mixtures


  • Stack Measurements
  • Indoor Air Quality Assessment (Hospital and Industrial Sterilization)
Ethylene Oxide Gas Analyzer

Fugitive Analyzer

High-sensitivity, continuous measurements of EtO at the fenceline. Enables detection of fugitive emissions away from the source. 

Performance highlight: 

  • <100 ppt LOD
  • Optimized for long-term monitoring


  • Fenceline Monitoring
  • Emission Source Determination
Ethylene Oxide Gas Analyzer

Ambient Analyzer

Best-in-class LOD. Enables long-term community monitoring and characterization of air quality.

Performance highlight: 

  • <25 ppt LOD
  • Optimized for ultra-high sensitivity


  • Community Monitoring
  • Ambient Air Quality Assessment

The G2910 Stack and Indoor Air Quality Analyzer introduces technical services companies to the most sensitive (<250 ppt LOD), interference free, real-time measurement of EtO concentrations, enabling new measurement opportunities and more efficient deployments. The advantages of CRDS over incumbent methods (e.g. FTIR) enable new measurement opportunities and more efficient deployments.

The G2920 Fugitive Analyzer introduces the measurement community to a platform that supports long-term monitoring of the fenceline. Performance standards set by expensive, difficult to use, research-grade instruments (e.g. PTR-MS) are overshadowed by an, easy-to-deploy technology with best-in-class LOD (<100 ppt).

The G2930 Ambient Analyzer represents the greatest leap in EtO detection (<25 ppt LOD) and meets an ambitious goal of continuously protecting communities from long-term exposure to EtO. Continuous monitoring with CRDS removes unknowns that arise from data gaps and lack of flask sampling.

At the heart of our new Picarro analyzer is a high-resolution spectrometer that can identify the unique spectral signature of EtO among other common compounds in the atmosphere. As a result, the systems are insensitive to cross-interference from isopropyl alcohol, BTEX, water vapor, carbon dioxide, methane and others. The remarkable stability, performance and ease-of-use of the platform, adopted over the years by the world’s most demanding research organizations, now provides an exciting alternative to a market in desperate need of disruptive technology. The ethylene oxide gas analyzer family of products address the needs of communities and the regulatory landscape by providing an exciting, easy-to-use technology alternative, with better limits of detection and a reasonable price point.

EtO - What is it and why should you care about it?

Ethylene oxide (C2H4O) is a common organic compound used in multiple large-scale chemical operations. Its largest demand comes from the textile industry, detergent producers and the natural gas industry. The compound is also used in a highly effective method of low-temperature sterilization of medical equipment and foods. While the mutagenic properties of ethylene oxide have been known since the 1940s, the regulatory landscape around emissions and exposure limits has evolved over time. The chemical is now believed to be more harmful than previously realized and new air quality studies are required to better characterize the risk to workers and communities.

 EtO in the news

In 2018, the EPA responded to growing public and political pressure regarding a possible leak of ethylene oxide from Sterigenics' central facility in Willowbrook, IL. This facility was used to sterilize medical equipment, pharmaceutical drugs, spices and food. A measurement campaign, run in cooperation with the Agency for Toxic Substances and Disease Registry (ATSDR) determined that:

“… an elevated cancer risk exists for residents and offsite workers in the Willowbrook community surrounding the Sterigenics facility. These elevated risks present a public health hazard to these populations.” – ATSDR, July 2018 report

EtO Resources


Browse our selection of brochures, data sheets, etc. 


Learn how to characterize EtO from Picarro and partners


Get valuable insights from our technologists


Learn more about Cavity Ring-Down Spectroscopy (CRDS)

EtO Analyzer Applications













Ethylene Oxide Gas Analyzer - Applications