PID Gas Detectors in Industrial Hygiene Applications


6th August 2020

Download Application Article

Industrial (or occupational) hygiene places the emphasis on prevention of ill health from work, through recognizing, evaluating, and controlling the risks. For anyone working with hazardous compounds, these chemicals represent a significant potential source of risk. Modern PID gas detectors provide reliable detection of over 200 of the most dangerous chemicals, helping to ensure effective industrial hygiene.

Many chemicals in common use have been identified as extremely hazardous, representing serious health risks to personnel in the plants where they are manufactured or used, as well as to those tasked with transporting them. All are governed by clearly defined exposure limits, and being able to accurately monitor hazardous chemicals at these concentrations is a vital aspect of industrial hygiene.

The first step in industrial hygiene applications is of course to identify the types and sources of hazardous chemicals. Any location where the chemicals are stored or used should be regularly monitored. This can be performed with hand-held instruments, or with fixed-in-place detectors that can send the information directly to a control system. A plant survey might identify possible sources of leaks and emissions that should be monitored with hand-held instruments. Further, the use of hand-held instruments should be used to regularly sweep for ‘hot spots’ or high concentrations.

Among the more toxic chemicals in industrial use are vinyl chloride, ethylene oxide, styrene, polyols, acrylates, and solvents, together with a host of other VOCs. Many of these are produced as intermediate products in the manufacture of other chemicals. Vinyl chloride, for example, is produced as the precursor of PVC. Known to cause liver cancer, vinyl chloride must be carefully monitored for ambient concentrations during its manufacture, during its transport, and during the manufacture of PVC, while the finished PVC also has to be tested for residual vinyl chloride. Another toxic chemical and known carcinogen is Ethylene oxide, used as a sterilization gas for medical products. It is also used for fumigation and as a conversion product in pharmaceutical processes, but most industrial exposure that would be regarded as hazardous is in the production of the chemical itself or in the manufacture of medical products which have to be sterilized before shipping.

Styrene, like ethylene (and all other double-bonded alkenes to varying extents), is toxic, but all of these chemicals are useful in that they can be polymerized by opening up the double bond and joining them together. There is the risk of exposure to Styrene both in its manufacture from petroleum fuels, in its transportation, and in its subsequent use to produce polystyrene.

We can look, too, at chemicals such as isocyanates used as reagents in the production of polymerized chemicals such as paints and glues, and at acrylates and epoxies, and at the solvents used in industrial processes, chemical industries, and pharmaceutical processes. Not all of these chemicals represent the same health hazards and not all carcinogenic links, while suspected, have been proven. Depending on the particular chemical, maximum exposure levels might be set at anything from a few hundred parts per million to under 10 parts per billion. The more dangerous these chemicals are, the smaller the concentrations that are permitted for exposure. Fortunately, they also tend to be easier to detect, even at low concentrations, given the right detection equipment.

Those tasked with monitoring and controlling industrial hygiene risk, choosing the right equipment to detect hazardous chemicals is paramount. PID has been proven to be the ideal technology for industrial hygiene applications as a screening tool because of its high sensitivity and ability to detect a wide range of organic compounds and other hazardous chemicals at ppb levels. It responds to a wider range of compounds and detects them more reliably and at lower levels than any other detection method.

The Ion Science portfolio of hand-held, portable and fixed PID gas detectors rapidly and accurately detect VOCs from 1ppb to 20,000ppm – a range unmatched by other PID gas detectors on the market. The incorporation of Fence Electrode and Anti-contamination Technology ensures that they give the fastest, most accurate, and most consistent results, even within challenging humid and dusty environments. The bottom line is they have all have been independently verified as the best-performing PID technology available today.

Download Application ArticleView All Application Articles

For more information on PID gas detectors, please contact us at:

or by telephone: +1 (877) 864-7710

Application Article

Everything You Need to Know about PID in Industrial Hygiene

Our Application Articles are available to download below, they provide you with key information on the exposure limits and the locations of where potentially harmful gases can occur within your application and share information on the gas detection monitoring techniques and equipment that can help you manage gas detection in the workplace.

PID gas detectors In Industrial Hygiene

Download Application Article

Related Application Articles

Building on a Legacy of Photoionization Detectors

From the 1970s to the present day, photoionization detectors (PIDs) have been at the front line of efforts to detect volatile organic compounds.

View Details

Continuous VOC Monitoring

VOCs and other toxic gases can produce major health effects, continuous VOC monitoring will alert nearby workers if harmful concentrations are reached.

View Details

Detecting Benzene in Refinery Atmospheres

Detecting benzene in a refinery is important as legislation across the globe have been put in place to ensure exposure of benzene at plants where it is produced is minimised.

View Details

Download your copy of the Application Article

Please complete the form below to download the Application Article.