At 01:31 PM 10/17/2000 +0100, you wrote:
>
>Tom says:
>
>>That can be as simple as a below chassis/above chassis pressure
differential
>>switch.
>
>Tom, is there a source of cheap differential switches that will operate
down to,
>say, 0.1 inch WG?
>
There must be Peter. I just took apart a scrapped blower/HV supply from a
gas burner. Included in the chassis was differential pressure switch. It
was connected across the blower. It is roughly the size of a hockey puck (
same diameter as a small beer mug and about an inch thick). It was made by
Tridelta Industries Inc., in Mentor, OH. A shaft is attached to the
internal diaphragm and is brought out to an external microswitch.
Phil
>73
>
>Peter G3RZP
>
>
>
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>
>
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