Dear Frank and all,
As a old CO testing hack I wished for scientific calibration and settled
for functional repeatability. Aside from zero I had a kerosene lamp that
I move through a range of clean flame heights (2,3,4 cm) and see how O2
and CO changed. Unfortunately all I am sure of is that they had good
correlation with each other, good for a hack. Aside from that we had our
oil fired Riello burners on our boilers which also behaved with
admirable consistency, similar to the kerosene lamp, only not portable.
I suppose some might think this is useful advice and others are
thinking "stop! This is what we don't want"
Practically yours,
Alex
On 10/26/2010 5:23 PM, frank wrote:
Dear Crispin and all,
We have Zero for one calibration, we have range, linear response and
detection limit. Working in a lab one can get overly critical of
reported values that does not go through all the steps at the time of
testing. I realize not as important for much of the stuff we do but if
we are to place values on CO in the air, set limits and the such, we all
need to be using calibrated equipment.
Does Emerson provide the supply gas? or use electrical signal for the
calibration? I suggest it can only be done using real pure gas.
Regards
Frank
Crispin Pemberton-Pigott wrote:
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
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