644钾钠氛分析仪斜标失败（SLOPEFAILED）有多种原因，其中之一是定标过程由于液体进入时没有被“探测器”探测到（SLOPENOTDETECTED）而导致定标失败。我们在工作中观察了解到定斜标时液体流动的情况，从而得到定标之所以失败的原因及处理的办法，现介绍如下：1定外标时法作流 There are several reasons for the failure of the 644 potassium-sulfur analyzer (SLOPEFAILED), one of which is that the calibration process failed because the liquid was not detected by the “detector” (SLOPENOTDETECTED). In our work, we observed and understood the situation of liquid flow when the ramp was fixed. The reasons why the calibration failed and the methods of processing were as follows: 1. The external standard time method was used as the flow.