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DL-2型电离规管采用热阴极,适于高压强下使用作真空测量。但是热阴极容易沾污而中毒。经激活处理,可延长规管使用寿命。一、激活阴极的步骤真空炉抽至10~(-4)托～10~(-5)托高真空,将瓶氢气经充气导管和炉体放气阀引入真空室。其充气导管为内壁经过清洗、烘干的不锈钢管,也可用乳胶管代替。充气时注意,先引入少量氢气,使充气导管里的残存空气经真空机组排出,然后再次通入少量氢气。当真空度降到1托左右,就停止供氢,关闭供氢阀门和炉体放气阀,真空机组照常抽真空,这时热偶管测
The DL-2 ionization gauge uses a hot cathode, suitable for use under high pressure as a vacuum gauge. But the hot cathode is easily contaminated and poisoned. Activation can extend regulatory life. First, the activation of the cathode step vacuum furnace pumping to 10 ~ (-4) care ~ 10 ~ (-5) care high vacuum, the bottle of hydrogen through the inflatable catheter and furnace deflation valve into the vacuum chamber. The inflatable catheter wall after cleaning, drying stainless steel tube, latex tube can also be used instead. Attention when inflating, first introduce a small amount of hydrogen, so that the residual air in the inflatable catheter discharge through the vacuum unit, and then re-access a small amount of hydrogen. When the degree of vacuum dropped to about 1 Torr, stop the hydrogen supply, turn off the hydrogen valve and the furnace deflation valve, the vacuum unit as usual vacuum, then thermocouple tube test