>My header tank is painted black. in the hangar I have no problem with the
>low level warning light coming on with the tank full. when I pulled the fox
>out into the sun today, the low level warning light came on. I suspect that
>light is being introduced into the header tank by the clear (but slightly
>yellow) vent line to the right tank that had the sun on it.
>
>Has anyone experienced this? How did you solve it.
When using the opto-reflective liquid level sensors, stray
light will always be an issue. Most of the applications I
designed for in the past were metalic or bladder tanks
and external lights were not a problem. In cases where we
did have to address the issue, a baffle or other shade
over the sensor tip was useful. One sensor I built had the
cone tip of the sensor surrounded by a black anodized cup
drilled with small holes. Liquid could get in to trip the
sensor but light was restricted.
Bob . . .
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( Knowing about a thing is different than )
( understanding it. One can know a lot )
( and still understand nothing. )
( C.F. Kettering )
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http://www.aeroelectric.com
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