If we are planning to interpret the results from the meter as we seem
to be doing it seems we should be calibrating them ourselves from a tank
of CO, CO2, O2, H using nitrogen as the carrier. I think emission
testing equipment may be designed to just record a relationship of the
gas mix as it come out of a stack (and changes within this relationship)
and not to specific values as we are using them even though they may
give us specific values. I can't imagine doing this type of test and
stating values without calibrating for each constituent each and every
time the test is run.
Frank
Frans Peeters wrote:
Dear stovers.
WHO CO : 9------> 7 ppm is theoretic .!
Practic is : China is selling UNTESTED TO LOW QUALITY CO Detectors to 90 %
of the fortunated people for 40 $ .
In sealed package ! You cannot see the sensitivity ! Mostly alarm 50ppm
after 2hours ..
Exemple Detector CO338 EC was a useless shipment to our country ! All
returned to China . Fals alarm after 20' .!
After 2 weeks I could repair one from a WRONG component . Resistor in sted
a capacitor in the Fet input microprocessor . 300 pages to read . No
schematic . No answer from supplier nor China constructor was possible .
It was not possible to repair a second the same way ! Different high
impedance 22Mohm .
Chemical CO sensors cannot be stored more then 1-3 months without supply
.!!!
Life time 5 years .
England sells better detectors with concentration display prior to the alarm
. 60 $ THE MINIMUM YOU MUST BUY !
A CO detector giving alarm at 7ppm within 10 minutes is an ILLUSION or may
cost 1500 $
A FIGARO combustible gas sensor type 811 sensible to CO is FASTER in
response ,but the zero is a floating limite !
Used with ampli uA 741.
My conclusion: the gas sensor is SAFER ! 50ppm gives immediately alarm and a
CO detector after 2 hours .
Fals alarm from cigarette smoke .is for free .
NEVER BUY a DETECTOR without knowing alarm ppm figur and response time for
that concentration .
SURE 90 % OF CO DETECTORS OWNERS use FALSE HOPE .
Be warned for CHINESE JUNCK.
------------------------------------------------------------------------
_______________________________________________
The Stoves list has moved to [email protected] - please
update your email contacts to reflect the change.
Please visit BioEnergy Discussion Lists
http://info.bioenergylists.org/
Thank you, Stoves
Administrator
http://stoves.bioenergylists.org
http://info.bioenergylists.org
UNSUBSCRIBE HERE;
http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
--
Frank Shields
Soil Control Lab
42 Hangar way
Watsonville, CA 95076
(831) 724-5422 tel
(831) 724-3188 fax
[email protected]
www.compostlab.com
_______________________________________________
The Stoves list has moved to [email protected] - please
update your email contacts to reflect the change.
Please visit BioEnergy Discussion Lists
http://info.bioenergylists.org/
Thank you, Stoves
Administrator
http://stoves.bioenergylists.org
http://info.bioenergylists.org
UNSUBSCRIBE HERE;
http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
