多用炉常用600mm和800mm，井式炉常用1000,1200,2000mm

　　马拉松是美国原装进口传感器，旗下两个收购品牌直径22/25mm都有，可供选择机会多，马拉松具有独特的电极结构，电极设计确保了探头的稳定性跟耐用性，保护管采用了RA330合金保护管，这种材料具有红硬性和耐腐蚀性，能够在高温下保持稳定使用

　　jinan is in locate northern latitudes 36 degrees 40 cent, east longitude 117 degree. Jinan is in South of Mount Taishan and North of Yellow River.there is belonging to warm temerate zone greatly six sex monsoon weather area,clear all the year round,sunshine full in Jinan.