At 04:13 PM 2/9/2004 +0100, you wrote:
>Can anyone suggest a good CO2 sensor, accuracy at 1000ppm must be better
>than 10% after 1 year. Intended use is in a greenhouse to control the
>inflow of heater exhaust gasses.

This kind of sensor is sometimes used to help minimize indoor air quality
in classrooms etc. They are not terribly expensive (maybe $500 or $1k
USD list price, with hefty discounts)

Here's one obvious (?) supplier:

http://hbctechlit.honeywell.com/techlit/pdf/63-0000s/63-8598.pdf

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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