Tape-based, Dry Colorimetric Method
Hydrogenolysis and Rateometric Colorimetry
Dry Colorimetric Detector Technique to detect impurities in petroleum samples is still the most wildly used and reliable technique. It utilises an impinger to collect gas in a liquid medium. Chemical reagents are then added to the medium to cause it to change colour in proportion to the concentration of gas present. The resulting colour change is measured by a laboratory spectrophometer and compared to standards. While the Tape Detection System is extremely sensitive to its target gas, it is also very specific to that gas. It will not react to other substances (solvents, hydrocarbons, etc.) often found in process streams. Thus, expensive downtime due to false alarms is virtually eliminated.