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Odour Measurement and Analysis Instruments

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In industrial odour measurement, rapid decision-making begins with robust field data. The Shinyei OMX series comprises portable odour analysers that help compare odorous gas variations using numerical readings during checks across manufacturing, wastewater, waste management, food, healthcare facilities and indoor environments. Your field team can compare conditions across different locations and monitor trends before and after deodorisation measures.

Shinyei OMX-SRM, OMX-ADM and OMX-TDM portable odour and TVOC measuring instruments

Shinyei OMX Series – Portable Odour Analysis and TVOC Measurement Instruments

Operation and technical details

Model selection: Three distinct measurement objectives

OMX-SRM – General odour trend

Designed for monitoring numerical odour intensity trends in field comparisons such as tobacco smoke, food, post-cleaning odours, process odours and similar applications.

OMX-ADM – Ammonia and objectionable odours

Supports the evaluation of odour changes in environments such as wastewater, decomposing organic matter, pungent ammonia-related odours, hospitals and nursing homes.

OMX-TDM – TVOC trend

Provides a toluene-equivalent digital readout for indoor air quality and volatile organic compounds. Does not separate individual chemical species with laboratory precision.

Field advantages and operating principle

Utilises two semiconductor gas sensors with an internal suction pump. The digital display, data logging and PC-based trend review functions assist in conducting reproducible field comparisons—for instance, across different points of a treatment plant, along food production lines, or before and after deodorisation treatments.

Current product description

Do not leave odour complaints solely to subjective assessment. The Shinyei OMX Series makes environmental surveys, process control and odour source investigations far more systematic with a portable analytical solution that helps rapidly compare odour and TVOC variations in the field.

Measurement limitations and compliance

OMX readout values are not directly equivalent to human odour perception; they must not be interpreted as European odour units (ouE/m³), as a verified ppm concentration of a specific gas, or as an accredited analytical result. The manufacturer explicitly states that the OMX family is not CE marked. For statutory odour emission measurements, reference methods such as EN 13725 dynamic olfactometry may be required depending on the scope of application.

Compare general odour variations with OMX-SRM, ammonia/waste odour trends with OMX-ADM, and toluene-equivalent TVOC levels with OMX-TDM directly in the field.

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Selecting the Right Instrument and Method for Odour Measurement

No single method is suitable for every odour problem. NOVEL helps you evaluate the differences between field screening, TVOC trend monitoring and laboratory reference measurements based on your specific application.

How to plan rapid field screening for an odour complaint?

Odour measurement and analysis instruments are used for identifying odour sources, performing field comparisons and assessing odour intensity in natural gas distribution, process facilities, waste and environmental applications. Depending on the application, the suitable method may be direct field measurement or sample-based analysis. Successive measurements can be compared at the point where complaints are concentrated, at a clean air reference point and under varying operating conditions of the process. Recording the measurement time, airflow, humidity, temperature and process status together makes the data substantially more meaningful.

What is the difference between odour trend, TVOC and dynamic olfactometry?

Because odour perception depends on human sensation, a reproducible method, correct sampling and instrument selection suited to the application are critical for the comparability of results. Instruments with semiconductor sensors, such as the OMX type, assist in field comparisons of odour/TVOC trends. In contrast, odour concentration under EN 13725:2022 is determined in ouE/m³ using a trained human panel and dynamic olfactometry; the two results cannot be used interchangeably.

Which sectors gain the highest operational benefit?

It supports the preliminary evaluation of odour sources and the monitoring of remedial efficacy across wastewater treatment plants and pumping stations, municipal waste centres, food and beverage manufacturing, chemical and pharmaceutical plants, hospitals, commercial buildings and industrial ventilation systems. If the exact concentration of a target chemical is required, a dedicated gas analyser or laboratory method must be selected separately.

How to verify an odour reduction investment in a manufacturing plant?

Before-and-after measurements are taken at the same sampling points under similar operating and environmental conditions; zero/reference calibrations and measurement conditions are recorded. Trend data obtained with the OMX assists in tracking internal plant improvements; it does not replace statutory measurements required for regulatory compliance.

Frequently Asked Questions About Odour Measurement and Analysis Instruments

What is the purpose of an odour measurement instrument?

Using suitable sensor technology, odour measurement instruments convert the response to odorous gases into numerical indicators, facilitating comparisons between field locations or over time. Shinyei OMX is a portable solution focused on preliminary assessment and trend monitoring.

What is the difference between Shinyei OMX-SRM, OMX-ADM and OMX-TDM?

OMX-SRM is designed for monitoring general ambient/process odour trends, OMX-ADM for pungent odour trends such as ammonia and rotting waste, and OMX-TDM for toluene-equivalent TVOC readings. The model must be selected according to the target gas of the application.

Does the OMX instrument measure odour concentration in accordance with the EN 13725 standard?

No. EN 13725:2022 determines odour concentration in ouE/m³ based on dynamic olfactometry with a human panel. The OMX instrument provides a numerical field indication via semiconductor sensors; it does not directly replace EN 13725 olfactometric measurement.

Are TVOC measurement and odour measurement the same thing?

No. TVOC provides an aggregate indicator associated with volatile organic compounds; not all odorous substances are VOCs, and the TVOC value is not directly equivalent to human-perceived odour intensity. OMX-TDM provides a toluene-equivalent TVOC indicator.

Does OMX-TDM measure benzene, toluene or xylene concentrations individually?

No. OMX-TDM provides a toluene-equivalent TVOC trend; it cannot be used in place of laboratory analysis that isolates verified concentrations of individual VOC compounds. Where target chemical-specific measurement is required, a suitable technique must be identified.

In which facilities can odour screening be performed using Shinyei OMX?

Reference points and suspected odour areas can be compared in wastewater treatment, waste management, food, chemical, pharmaceutical, healthcare facility, enclosed building and manufacturing process environments. Measurement conditions and the sensor response of the target odour can affect results.

Does the OMX series feature an internal pump and data logging?

Yes. The manufacturer provides continuous sampling with an internal pump, two semiconductor sensors and data logging for the OMX-SRM, OMX-ADM and OMX-TDM. A logging capacity of up to 32,732 data points and 511 files is specified on the manufacturer's webpage.

Is the OMX series CE certified and can it be used for statutory odour reports?

Official Shinyei documentation states that the OMX series is not CE marked. Where statutory odour emission or occupational hygiene compliance reporting is required beyond field screening, an instrument and method compliant with the relevant regulations and reference measurement standards must be selected separately.

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