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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear Developers <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>There is a new portable oxygen monitor from Omega <a href="http://www.omega.com/Green/pdf/HHAQ-104.pdf">http://www.omega.com/Green/pdf/HHAQ-104.pdf</a> that appears to be able to record logged data automatically. I did not have time to talk to them about logging onto a computer but it has capacity for 32,000 data points on board which indicates it can log internally.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It only measures O<sub>2</sub> and humidity but that is a good start if you have no instrumentation at all. IT has a temperature sensor but that is only for the gas sample – you would still need a thermometer for stack temperature if that was your area of work. It has altitude compensation.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The link in their new product newsletter is:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://www.omega.com/pptst/HHAQ-104.html?utm_medium=email&utm_source=D1214&utm_source=OMEGA+Engineering+Newsletter&utm_campaign=4bc8640bef-D1214&utm_medium=email&utm_term=0_8f0f6139e6-4bc8640bef-197102433">http://www.omega.com/pptst/HHAQ-104.html?utm_medium=email&utm_source=D1214&utm_source=OMEGA+Engineering+Newsletter&utm_campaign=4bc8640bef-D1214&utm_medium=email&utm_term=0_8f0f6139e6-4bc8640bef-197102433</a> <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For the experimenter the main use of the O<sub>2</sub> reading is to find out at what excess air level the performance is best, or what it is at certain stove settings. For very clean stoves, the ‘eye test’ and the smell test are useful for determining if the emissions are very low. The Eye Test is allowing the output (‘smoke’) to make contact with your eye. If you can’t feel anything it is pretty clean. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If you want to measure, at least roughly, the PM concentration, take a 2 photos on a relatively dark room. The PM will reflect a haze of white light when the flash is used. Combining that with the O<sub>2</sub> value can give you a general value of the undiluted concentration.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards<o:p></o:p></p><p class=MsoNormal>Crispin<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>