High temperature proximity switch

Does anybody know of a proximity switch that can withstand 200 C on the sensor head..?
I need a proximity switch that can detect e.g. a bolt head in a 200 C
environment. We have it mounted on the outside detecting through a glass - but still the radiation and conduction from the brackets will make it reach 180+ C.
Any suggestions on make and type?
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hi
Take a look at
www.balluff.com
not sure if they do one, but they are high quality supplier.
steve

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? 2007?5?16????UTC+ 8??9?31?43??DD100? ??

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