mawleymoos
Member
- Location
- Shropshire
No 1 and 2 is the methane percentage pre and post the filtration, 3 and 4 is again pre and post filtration H2Sppm! It averaged 44kwh over the last 24 hrs!
Is it too late for AD
- Thread starter mawleymoos
- Start date
No 1 and 2 is the methane percentage pre and post the filtration, 3 and 4 is again pre and post filtration H2Sppm! It averaged 44kwh over the last 24 hrs!
- Location
- North Norfolk
What make of gas analyser is that? Its a new one on me. Very interested to find out.
Stephen
Digester Man
Member
Looks the same as mine, made by Gas Data in the UK. Great value for money compared to all the others I looked at.
- Location
- North Norfolk
So not continuously sampling, a collection of valves to do intermittent samples? Thats how they were when I looked at them some years ago. Or have they moved to continuous?
Digester Man
Member
It takes a sample every hour, I didn't see the need for continuous. Also means your sensors will last longer. I should really reduce the sampling rate in mine to a longer interval like every 4 hours, to preserve the life of the sensors.
- Location
- Cumbria
Guys, this is not a gas analyser, it is data reader/network switch.
Something else is doing the analysing, not this.
Something else is doing the analysing, not this.
Digester Man
Member
It is the brain of the analyser which interprets and outputs the data from the CH4, o2, H2S and H sensors in my analyser.
Ps, for those eagle eyes viewers, my o2 sensor needs replaced.
- Location
- Cumbria
Thanks.
I see your CH4 has dropped in quality, however your H2S (after cleaning I assume) has increased, why is that ?
I see your CH4 has dropped in quality, however your H2S (after cleaning I assume) has increased, why is that ?
Digester Man
Member
Your comparing me with someone else
- Location
- Cumbria
Sorry, I thought they were all the same plant. (his O2 sensor needs replaced aswell 
)
)
- Location
- North Norfolk
Its a programmable logic controller, Siemens Logo, which can be used at the heart of many instruments and controllers. We use them, as well as Mitsubishi Alpha and Schneider Zelio. We have 7 Alphas round the farm, two on the digester and two Zelios
- Location
- North Norfolk
Ah, so it is sampling hourly rather than continuously
- Location
- North Norfolk
Our Hitech has been running continuously for 7, nearly 8 years and has had one H2S sensor replaced with a modified design. O2 sensor is original, as is methane
Digester Man
Member
That is some job! Does it ever need Calibrated? I think I will hire a certified mobile unit for calibrating my own soon whenever I get a replacement o2 cell
- Location
- North Norfolk
We calibrate 2 or 3 times a year. All you need is some small cylinders of calibration gas with regulator, and a bit of hose to connect up. We find very little change apart from the zero on the H2S which drifts a bit.
- Location
- Cumbria
Hazzop dictates calibration frequency, or is it HASUP ?? or even HACCP and/or HAZOP
Mucktogold
Member
- Location
- Suffolk
Thanks, OMNI seems to be more professional and looks after their customers.
Wonder how many Bioelectric digestors are now running at 52 Kw, as advertised?
mawleymoos
Member
- Location
- Shropshire
Hi! I am not an expert on running it yet! However we hadn't been running v.long at that point and maybe not 24 hrs a day, so the CH4 did fluctuate a little! It got up and sat at 60 a few days later! The H2S generally is in single figures at the exit of the filtration! However you mentioned that the O2 sensor is faulty! Do you think that the O2 level should be higher? It does seem to fluctuate if any work has been done in the past! So I believe it to be working!
- Location
- North Norfolk
The oxygen sensor is the easiest to calibrate! Feed it pure air and it should read 21.0. Feed it any other calibration gas and should read zero.
Mucktogold
Member
- Location
- Suffolk
Has anyone got one of these digestor from this company? Only 250 cows for over 50 Kw, must be good.
http://www.savingenergygroup.org/se...-for-your-clients/funding-options#self-funded
http://www.savingenergygroup.org/se...-for-your-clients/funding-options#self-funded