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The voltage spec'd on these units is pretty loose and the valves are desiged to cope with that range. For example, the 750 mv unit at :

http://www.honeywellcentral.com/product/0-85267-87879-1.html

is rated 600mv to750mv open circuit. Measured in circuit, the output could be even lower than 600mv and be OK .

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Q: If you have a 750 millivolt valve however the thermopile leads only generate 600 mv is that sufficient to open valve?
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