Thanks, Philip.

Coincidentally, I found the Omron site just before you sent your email and I
think they have exactly what I need, including one with an integrated relay
driver and cable arrangement. The sensor has to fit in a very small space
indeed and these look to be just the ticket.

Regards,

John


On 12/07/2009 10:38, "Philip Nye" <philip@...> wrote:
>
> I've used switches from Omron to good effect - you probably need one with a
> slit aperture in front of the detector side which makes them much more
> precise at the expense of a little sensitivity.



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