The Series 8900 Ethylene Oxide Analyzer combines the selectivity of gas chromatography with the sensitivity of a Photoionization Detector (PID) providing interference free response to Ethylene Oxide (EtO) at levels below 0.05 ppm. This analytical method is referenced in OSHA's "Occupational Exposure to Ethylene Oxide: Final Standard" 29 CFR Part 1910.

The system documents exposure levels including: time-weighted averages (TWA), short-term exposure limits (STEL) and instantaneous alarms.

Areas that are typically monitored include; EtO Sources - gas storage areas, sterilizer doors, aeration doors, and the General Work Area - decontamination, packaging and preparation and sterile product storage areas.

The 8900 EtO Analyzer uses a dual column configuration with timed backflush to vent which is used to strip off moisture and heavier hydrocarbons. At sample injection a fixed sample volume is carried to the pre-cut column. Backflush of the pre-cut column is timed from sample injection so that only EtO and other similar components are eluted from the pre-cut column to the analytical column. Contaminates on the pre-cut column are then vented. EtO is separated from potentially interfering components on the analytical column and elutes to the photoionization detector (PID) and/or flame ionization detector (FID) for analysis.
Unit of Measure


N/A Monitoring workplace exposure limits in and around sterilization facilities.



  • Direct measurement of Ethylene Oxide
  • Interference free response
  • Automatic baseline adjustment for long-term stability
  • Automatic calibration to a known EtO standard
  • Reports exposure levels, TWA, STEL, and instantaneous alarms
  • Analog output ranges are user selectable
  • Graphic display of current or historical concentrations
  • Multipoint sampling options
  • RS-232 and optional LAN

  • Specifications

    Analysis Time

    N/A <60 seconds


    N/A PID (FID or High-sensitivity PID Optional)


    N/A Packed

    Oven Temperature

    N/A 80ºC, Nominal

    Carrier Gas

    N/A Nitrogen, 40 cc/min, Nominal

    Lower Detection Limit

    N/A 0.01ppm EtO


    N/A 1% @ 1ppm


    N/A 2% of Measured Value

    Span Drift (24HR)

    N/A <2% of Full-scale

    Sample Flow Rate

    N/A 250 - 500 cc/min, typical


    Digital: RS-232, optional Local Area Network
    Analog: (1) 0-20ma or 4-20ma loop power supplied, isolated. Selectable for: gas concentration, unintegrated detector signal. Options for up to 20 additional programmable 0-20ma, 4-20ma or voltage outputs: 0-1V, 0-5V, or 0-10V.


    N/A (5) User programmable relays for concentration and diagnostic alarms (1A @ 30Vdc). Options for up to 32 additional relays available.


    N/A Optional digital input board for 3 contact closure inputs. Supports start analysis, start calibration, and analyze calibration gas sample.