笔者从事百特ＳＰＳ550型人工肾维修保养近5年,现介绍两例故障检修与同行商讨。　　故障现象一　电导持续低报警。故障分析　单纯的电导低报警,主要考虑以下几种情况。(1)配制浓缩液不合格,或者流量不足500ｍｌ;(2)ＰＣ2Ｂ电路板故障;(3)电导温度传感器坏,或者电导电池短路;(4) The author engaged in the maintenance of the Baxter SPS550 artificial kidney for the past 5 years. Two troubleshooting cases are discussed with peers. Fault phenomenon: Conductance continues to be low alarm. Failure Analysis A simple conductivity low alarm mainly considers the following situations. (1) The preparation concentrate is not qualified, or the flow rate is less than 500ml; (2) PC2B circuit board failure; (3) Conductivity temperature sensor is bad, or the conductance battery is short-circuited; (4)