对钢铁用非水定碳及碘量法定硫时,每当氧气断开后,由于导气管处的玻璃浮子不是很严密的,往往吸收液立即进入导气管,在试样燃烧过程中也有回吸的现象,这影响测试结果的准确性。为了避免吸收溶液回入导气管,我们在吸收杯前加一个自动封闭装置(图1)。封闭嘴的制作方法是选用一个新的薄橡皮膜,用碱或肥皂水洗净,凉干后剪约20×30毫米一块,用橡胶胶水沾成如图2的形状(阴影部分为胶沾处,沾好后,留有宽2～3毫米、长6～7毫米的空隙为出气口),然后套到或固定到小橡皮塞或玻璃管上。套好后,胶沾 For the steel with non-aqueous carbon and iodine statutory sulfur, whenever the oxygen is disconnected, due to the glass float at the airway tube is not very tight, it is often absorbed into the airway immediately into the airway, during the combustion of the sample The phenomenon, which affect the accuracy of test results. In order to avoid the absorption solution back into the airway, we added an automatic closing device in front of the absorption cup (Figure 1). The method of making the closed mouth is to use a new thin rubber membrane and wash it with alkali or soapy water. After drying it, cut a piece of about 20 × 30 mm and stick it into the shape as shown in Figure 2 with rubber glue (the shaded area is the glue area , After leaving, leaving a width of 2 to 3 mm, 6 to 7 mm long gap for the outlet), and then set to or fixed to a small rubber stopper or glass tube. After a good glue stick