From: "Crispin Pemberton-Pigott" <[email protected]>
Sent: Friday, August 06, 2010 1:52 PM
For those who need to develop some sort of lab don’t hesitate to get in
touch. I am committed as you know to >spreading knowledge around until it
falls off the table. John D, do look up that little NDIR CO2 sensor. Looks
promising.
Crispin,
I had a look, but am put off by the low range 2000ppm. I have already
acquired sensors from FIGARO for my tester.
The sensors that I have are of the electrochemical type.
O2 - 0 to 25% _ creates its own voltage output which can be coupled
directly to a digital volt meter .
CO 0 to 10000 ppm - creates a small current which needs to be amplified
to volts through an amplifier circuit.
CO2 400 to 45 000 ppm - this is a module requiring a 5V feed giving off
4.5v at max range, - can be coupled direct to a volt meter.
They all have linear outputs. No logging device, JUST raw readings to be
entered into a spread sheet. Total cost estimated at about $300.
I just need to find the time to build it.
John.
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