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methanizer poisoned by o2
Posted: Wed Sep 01, 2021 4:19 am
by sana70
hello
we have a zero air sample that we want to determine it's CO2, we inject the sample to FID GC with methanizer
is there any probability of methanizer being poisoned?
Re: methanizer poisoned by o2
Posted: Fri Sep 03, 2021 6:21 am
by antonk
No
* Your sample is diluted with inert carrier gas
* Your methanizer is heated over 325
* If you afraid - inject twice amount of hydrogen after
Re: methanizer poisoned by o2
Posted: Sat Sep 04, 2021 9:17 am
by sana70
No
* Your sample is diluted with inert carrier gas
* Your methanizer is heated over 325
* If you afraid - inject twice amount of hydrogen after
thank you for your responding, actually we are injecting this sample every day, but i mean if there is a probability of poisinig or degradation in long time?
Re: methanizer poisoned by o2
Posted: Fri Sep 17, 2021 7:03 am
by antonk
DGA - dissolved gas analysis in oil-filled power equipment.
Two sample loops simultaneously inject Ar-dissolved gas phase captured over transformer oil into MoleSieve on TCD detector and Hayesep on FID + Methanator
Sample may contain atmospheric O2 (due to mishandling of gas-sampling equipment). Probe analysed up to 5 times a day.
1. TCD shows real amount of O2.
2. They change methanizer catalyst once in 2-3 years or condition it with H2 flow at high temperature, so it lasts much longer.
P.S. I recalled - the gas scheme provide constant feeding of H2 to methanizer.
If you notice sensitivity drop - just raise temperature and leave it for 10-12 hours.