We have to choose between the dilution or extraction methods. We need to specify a new CEMS (continuous emission monitoring system).

According to literature the dilution system allows low maintenance.

We want to implement the best option, considering a cost - benefits analysis.

Thanks

 

there are three types of CEMS

1. dilution type

2. extraction type

3. in-situ.

Both dilution and extraction requires high maintenance. Dilution requires the gas under test to be diluted with air to reduce its concentration thus making its reading unreliable. The dilution method is also considered extraction.

For extraction type, it requires a pump and to extract the gas to the analyzer unit through a heated sample line to prevent condensation.

For maintenance concerns, I suggest you use in-situ. The analyzer unit is integrally mounted on the stack and requires very much less maintenance and installation.

 

yes, insitu anlyser is a best solution compare to extractive... please make sure your stack diameter is more then 1 meter dia to install insitu probe ...

dilution technology is used to avoid the the heat tracing in the sample line ... its very difficult to maintain the dilution factor constant and measurement accuracy in dilution type is very low...

my recommendation is go with insitu and you can save the power consumption also .

the power consumption of insitu is only 10 % of extractive analyzer system..