[Stoves] Gas Sensing

[Crispin Pemberton-Pigott]

Dear Bear

I am so pleased to hear of your work on a combined analyser.  I recommend
you review the devices occasionally made by Dr Tami Bond. She has quite a
wealth of experience with instrumentation.

I will report a little later on a development at the Max Planck Institute on
particulate measurements that will be duplicated by Prof Harold Annegarn at
the University of Johannesburg. At this time I have no inkling what cost is
involved or the hardware involved by they seem to be excited about it.

I am happy to have separate units doing different things. In the end, the
dilution has to be calibrated continuously do Tami suggests 2 CO2 sensors
for checking the dilution level.  We will do this in Ulaanbaatar in a few
weeks.  It is probably more accurate and cheaper to use two CO2 cells than
to try to calibrate a pump.  However most instruments seem not to be able to
handle two CO2 cells at the same time.

We discussed using a pressurized tank of argon or nitrogen to create
dilution (+ 2 x CO2) without a pump at all which might also be cheap to run.

Regards
Crispin

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