Dear Frank I think the calibration is needed now and then. Real calibration against a calibrated source.
Daily, we look for how it treats air. I like Philip Lloyd's practise of removing the probe from time to time to see if it has CO go to zero. It is rare for cells other than CO to have problems. CO cells can get saturated and report high for quite a long time (an hour). In UB we use air as a start and finish calibration. The instruments are so accurate it is amazing. The CO2 will happily report 17% and after 5 hours of zipping up and down, settle on air being 0.039% within a few seconds. However, the issue of absolute calibration is important enough that Emerson offers an attachment that will recalibrate each time the instrument changes ranges! Regards Crispin _______________________________________________ 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
