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Gentleman: may i refer to the phtotelectric sensor,it be able to use in this rigorous conditions: 1.temperature: ≥ than 120℃, 2.resist the corrupt of high-salinity atmosphere, 3.in dusty, and the sensor is low power wastage at below 5 working-voltage,maybe continuous using 5 months or more longer no changed the power-system.the inductive distance is about 50-80mm. pls conect to me if you have any questions. best rgds petter.zhou Phone no.086-513-5562116-3027 Nantong CIMC Special Trasportation Equipment Manufacture CO., Ltd. Lujingan Nantong City Jiangsu Province China