I look for the inert liquid (which does not react with H2S, CH4 and CO2) because Hg reacts with sulfide ion.
using a U Tube Manometer with Colored water is best for your application, morever
dial or bourden dial /pressure gauges are not accurate.
U tube manometer would have a least count of 1mm
a Manometer with a range of 50-0-50cm is best suited
Thank you very much Hamed Barghi & Tejas Lele for your suggestions
Don't forget that the error of pressure drop measurement could be ~10-20%. Use cathetometer to obtain the level difference precisely!
if your reactor does not control temperature you should measure it as well ensuring a feeding of substratum. In any application if pressure is the result of a true lack of oxygen and water vapour is trapped before the pressure device, pressure variations depend on consumers density and activity and on CH4 H2S NHR release; not very much CO2 is expected. In all other cases pressure is a sort of complex information, and organic bromide can be more dense than water and very passive. If the u tube end is left closed you can mount as plug a silicon sensor at the end for small investement and read it with an USB mVolt meter
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