[Stoves] METHANE MEASUREMENT

[Frans Peeters]

Dear Stovers 
 
Months ago some one looked for a CH4 measurement  .
 
   For digesters flow concentration output reading ,a TOTAL COMBUSTIBLE
GAS indicator is sufficient .
You make it with a  FIGARO PELISTOR ( 20 $ ) and Ohm or voltmeter .
200- 5000 ppm CH4 . 
For unsensitive readings 5-60 % you need a 1/20 gas /air diluter bypass
.+ pellistor 
Or Pt 100  hot wire filament ,measuring the combustion heat by
resistance change .
 
   For PURE METHANE  CH4  measurements you need INFRARED Photometer with
filter of 8 um .and
Photo Sensor Pb Se . Lead SELENIDE
The best detailed  publication for attemting to construct the basics
with a few opamps chips    is :
HP Journal  sept 81  pp13    by  J .J. KRIEGER .
ANESTESIA CONTROL by  breathing air .. CO2 , N2   , H2O  ,  CH4
measurement .
One photometer and 4 filters for different gasses .and PC controlled .
 
   Mind every spair CD rom contains a useful  IR sensor and laser for a
gas adsorption meter .
 Edmund Scientific USA might have the filters .
 
Greetings 
Frans . 

-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.392 / Virus Database: 268.6.1/343 - Release Date:
18/05/2006