故障现象　超滤量设定超过 5 0 0 0ｍｌ时 ,“ｃｏｎｄｕｃｔｉｖｉｔｙ 1”即出现低值功能报警 ,且超过的数值越大 ,报警频率越高。分析检修　本例故障从表面现象看 ,属电导度控制检测部分故障。但本故障的特点是当超滤量设定低于 5 0 0 0ｍｌ时 ,整机运转正常。故可基本认定 Fault phenomenon When the ultrafiltration volume setting exceeds 500ml, “conductivity 1” will appear as a low-valued function alarm, and the larger the value is, the higher the alarm frequency will be. Analysis and Maintenance In this case, the fault is seen from the surface phenomenon, which is a part of the conductance control and detection failure. However, the feature of this fault is that when the ultrafiltration volume is set below 500 ml, the whole machine is operating normally. It can be basically recognized