I need to measure gas concentration in a system before and after filtering. But I don't have access to some of these gases sensors and I don't have enough information about available analysis methods for this purpose. Is there any analysis method capable of doing that for me?
For CO you need a direct reading instrument, however H2S AND NH3 there are many direct reading instruments for measuring them or if you don't have access for such instruments you can use standard chemical methods you can find them easily on internet
https://www.cdc.gov/niosh/docs/2003-154/method-h.html
This link contains methods for many gases.
Perhaps you might use of tubes loaded with specific reactive chemicals for each of your gases. These sampling tubes are cheap compared to monitors and available in different concentration ranges. Look for instance at the product line of Dräger https://www.draeger.com/en_me/Applications/Productselector/Portable-Gas-Detection#s=12
You need to use a sample to take a sample, go to the laboratory to measure the concentration by a device. Another method is to use a field device with a probe to measure the required gases directly without taking a sample.
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